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1.
Med Probl Perform Art ; 36(1): 27-33, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33647094

RESUMO

BACKGROUND: Hand-held dynamometry is considered an efficient, effective, and portable means of objectively measuring lower extremity strength; however, it has yet to be studied specific to dance-relevant muscle performance. Also, dynamometry is often criticized for variability in results based on tester strength and sex. Use of an external stabilizing device has been suggested to minimize differences in outcomes between male and female testers by reducing variability associated with tester strength limitations. Therefore, this study used a barre-mounted, portable dynamometer stabilizing device to improve consistency of results among different testers for assessing hip and lower extremity muscle performance in dance-relevant positions. OBJECTIVE: To assess the intra and inter-rater reliability of a barre-mounted dynamometer stabilizing device in measuring muscle performance in common dance maneuvers. METHODS: Two testers assessed muscle performance of three common dance maneuvers--développé en avant, à la secondé, and arabesque--on 11 pre-professional and professional dancers on two separate occasions to establish intra- and inter-rater reliability of the barre-mounted dynamometer stabilizing device. RESULTS: Intra-rater reliability was moderate to high and inter-rater reliability of the device was excellent, with intraclass correlation coefficients ranging from 0.527-0.851 and 0.834-0.953, respectively, for all positions. CONCLUSIONS: The barre-mounted stabilizing device shows promise in mitigating tester strength or fatigue in assessing muscle performance of dancers. Initial assessment of the device suggests further study may be indicated to improve generalizability to applications of larger-scale muscle performance screening and assessment in dancers or other athletic populations who engage in movements that require extensive hip range of motion and multi-joint stability. CLINICAL RELEVANCE: Using a portable, barre-mounted stabilizing device in assessing multi-joint lower extremity muscle performance in dancers improves consistency of testing results. Application of this testing device into wider scale screenings could assist in developing normative data for a population that is lacking.


Assuntos
Dança , Feminino , Humanos , Masculino , Força Muscular , Dinamômetro de Força Muscular , Amplitude de Movimento Articular , Reprodutibilidade dos Testes
2.
Nutr Metab Cardiovasc Dis ; 31(4): 1035-1043, 2021 04 09.
Artigo em Inglês | MEDLINE | ID: mdl-33573921

RESUMO

BACKGROUND AND AIMS: The present study investigated the association between abdominal aortic calcification (AAC) and handgrip strength (HGS) and the ability of HGS to predict an increased AAC phenotype in adults. METHODS AND RESULTS: The analysis consisted of data for 3140 men and women aged ≥40 years (51.7% women) from the 2013-2014 NHANES. Lateral scans of the thoraco-lumbar spine (L1-L4) were scored for AAC using a validated 8-point scale (AAC-8); subjects with a score of ≥3 were considered at increased risk for cardiovascular disease due to a high AAC phenotype. HGS was assessed using a grip dynamometer. The prevalence of severe AAC in the population was 9.0%. Decline in HGS was associated with higher AAC-8 scores in men and women (p < 0.001). General linear model analysis showed that HGS levels were negatively associated with high AAC (p < 0.001) and AAC-8 status for both sexes. Likewise, for each 5-kg higher HGS, there lower odds of a high AAC phenotype (in men OR = 0.73, CI95%, 0.64-0.84) and (women OR = 0.58, CI95%, 0.47-0.70). Receiver operating characteristic curve analysis showed that the HGS threshold value to detect high risk of AAC in adults was ≥37.3 kg (AUC = 0.692) in men and 25.1 kg (AUC = 0.705) in women. CONCLUSION: Lower muscular strength, as measured by HGS, is associated with higher AAC scores in the U.S. population ≥40 years of age. Accordingly, maintenance of muscular strength during aging may protect adults against vascular calcification, an independent predictor of cardiovascular events. HGS measurement seems to be a valid screening tool for detecting a high ACC phenotype in adults.


Assuntos
Aorta Abdominal , Doenças da Aorta/epidemiologia , Força da Mão , Sarcopenia/epidemiologia , Calcificação Vascular/epidemiologia , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Aorta Abdominal/diagnóstico por imagem , Doenças da Aorta/diagnóstico por imagem , Doenças da Aorta/fisiopatologia , Estudos Transversais , Feminino , Nível de Saúde , Humanos , Masculino , Pessoa de Meia-Idade , Dinamômetro de Força Muscular , Inquéritos Nutricionais , Fenótipo , Exame Físico/instrumentação , Valor Preditivo dos Testes , Prevalência , Medição de Risco , Sarcopenia/diagnóstico , Sarcopenia/fisiopatologia , Estados Unidos/epidemiologia , Calcificação Vascular/diagnóstico por imagem , Calcificação Vascular/fisiopatologia
3.
Phys Ther Sport ; 48: 1-11, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33341516

RESUMO

OBJECTIVE: To determine the validity, intra- and inter-rater, and absolute reliability of a return to sport testing battery for the shoulder in a healthy cohort. DESIGN: Cross-sectional design. All participants completed a battery of strength (isokinetic, isometric, and repetition to failure) and functional assessments on two occasions. Concurrent validity to isokinetic testing was assessed, and intra-rater, inter-rater, and absolute reliability were established for all assessments. SETTING: Controlled clinical environment. PARTICIPANTS: Thirty healthy adults active in recreational sports participated, mean age 24.0 ± 1.6 years; MAIN OUTCOME MEASURES: Correlations (Pearson's r), reliability (Intraclass Correlation Coefficient), Standard error of the measurement, Minimal detectable change. RESULTS: Correlations to isokinetic assessments at 60° & 180°/second were moderate to strong for isometric (r: 0.68-0.80) and functional testing (r: 0.55-0.83) and weak for repetition to failure testing (r: 0.37-0.74). All isokinetic (ICC: 0.88-0.94), isometric (ICC: 0.83-0.94), and functional assessments (ICC: 0.80-0.92) had good to excellent intra-rater reliability, while repetition to failure testing had poor to moderate reliability (ICC: 0.48-0.57). The inter-rater reliability of the isometric assessments was moderate to excellent (ICC: 0.71-0.92) across movements. Expressed as a percentage of the mean, the standard error of the measurement ranged from 7% to 25% and the minimal detectable change ranged from 20% to 69% across all assessment methods. CONCLUSION: The isokinetic, isometric, and functional assessments used in this return to sports testing battery demonstrates acceptable validity and reliability. Further refinement to the methods used to assess muscular endurance is needed to improve reliability. This study offers clinicians information that can be utilized in clinical decision-making as it relates the testing battery's psychometric properties.


Assuntos
Teste de Esforço/métodos , Força Muscular , Volta ao Esporte , Ombro/fisiologia , Adulto , Fenômenos Biomecânicos , Estudos Transversais , Feminino , Voluntários Saudáveis , Humanos , Contração Isométrica , Masculino , Dinamômetro de Força Muscular , Psicometria , Reprodutibilidade dos Testes , Esportes , Adulto Jovem
4.
Medicine (Baltimore) ; 99(42): e22837, 2020 Oct 16.
Artigo em Inglês | MEDLINE | ID: mdl-33080765

RESUMO

OBJECTIVES: The Thrower's Ten Exercise program is an exercise program especially designed to improve the strength, power and endurance of the shoulder complex. The aim of this study was to investigate the effects of the Thrower's Ten exercises on the upper extremity performance in healthy sedentary individuals. METHODS: 36 healthy sedentary individuals completed this study conducted with a randomized controlled design. The subjects were divided into 2 groups: exercise and control. The exercise group received a training of the Thrower's Ten exercises of 50-minute sessions 3 times a week for a duration of 8 weeks. Before and after the study, the subjects were tested for dynamic balance on the upper extremity with the Upper Limp Y balance test and for explosive power with the medicine ball throw test. Moreover, the strength of the shoulder internal and external rotator muscles was measured with an isokinetic dynamometer at a speed of 60°/second. The study was registered on the Clinical Trials website by the number NCT04162886. RESULTS: A comparison between the groups showed significant differences in terms of dynamic balance and explosive power (P < .05), but not in terms of isokinetic muscle strength and body composition (P > .05). On the other hand, comparisons of the dynamic equilibrium, explosive power and isokinetic muscle strength parameters within the exercise group returned statistically different results (P < .05). CONCLUSIONS: The Thrower's Ten exercises represent an effective method to improve the balance on the upper extremity, explosive power and isokinetic strength in healthy sedentary individuals.


Assuntos
Terapia por Exercício/métodos , Força Muscular/fisiologia , Extremidade Superior/fisiologia , Feminino , Voluntários Saudáveis , Humanos , Masculino , Dinamômetro de Força Muscular , Comportamento Sedentário , Adulto Jovem
5.
Nutr. hosp ; 37(5): 964-969, sept.-oct. 2020. tab
Artigo em Inglês | IBECS | ID: ibc-198012

RESUMO

INTRODUCTION: chronic kidney disease contributes to decreased muscle strength and physical function through a decrease in muscle mass. Current evidence suggests that hemodialysis can accentuate this complication, as well as lead to deterioration of the patient's overall health. The aim of this study is to compare muscle strength in a group of Mexican patients undergoing hemodialysis, evaluated by dynamometry, with available reference values. MATERIALS AND METHODS: a cross-sectional study was conducted in male and female patients between 20 and 81 years of age, with stage-5 chronic kidney disease, from the outpatient Hospital General Regional No 46 of the Mexican Social Security Institute. Muscle strength was assessed by means of a mechanical dynamometer. The average value classified by age and gender was compared with the 50th percentile of a reference study. Inter-group differences were calculated with the nonparametric Mann-Whitney U-test, and correlation using Pearson's test, logistic regression, and chi-squared test. All patients signed an informed consent form. RESULTS: a total of 150 patients, 97 (64.7 %) men and 53 (35.3 %) women, were included in the study. The mean dynamometric value for muscle strength was 21.5 ± 10.1 kg, and a significant correlation was found with age, weight, and hemoglobin concentration. CONCLUSION: patients undergoing hemodialysis treatment for chronic kidney disease were found to be at the 10th percentile for muscle strength, as measured by dynamometry, thus demonstrating a marked decrease in muscle strength. This result could, however, also have been affected by different variables such as patient age, height, weight, glomerular filtration rate (GFR), hemoglobin concentration, serum creatinine, serum glucose, and the subjective global assessment, given that a significant association was also found between these and muscle strength


INTRODUCCIÓN: la enfermedad renal crónica contribuye a disminuir la fuerza muscular y la función física a través de una disminución de la masa muscular. De acuerdo con la evidencia, la hemodiálisis puede acentuar esta complicación, así como llevar al paciente a un deterioro del estado general de salud. El objetivo de la investigación fue comparar la fuerza muscular de pacientes con hemodiálisis, evaluada mediante dinamometría en una población mexicana, con los valores de referencia. MATERIAL Y MÉTODOS: se realizó un estudio transversal en pacientes masculinos y femeninos de 20 a 81 años, con enfermedad renal crónica en estadio 5, del área de consulta externa del Hospital General Regional No 46 del Instituto Mexicano del Seguro Social. La fuerza muscular se evaluó por medio de un dinamómetro mecánico. El valor promedio clasificado por rango de edad y género se comparó con el percentil 50 de un estudio de referencia. Las diferencias intergrupales se calcularon con la prueba no paramétrica de la U de Mann-Whitney y la correlación mediante la prueba de Pearson. Todos los pacientes firmaron la carta de consentimiento informado. RESULTADOS: la muestra del estudio fue de 150 pacientes, 97 (64,7 %) hombres y 53 (35,3 %) mujeres. De acuerdo con la dinamometría, la media fue de 21,5 ± 10,1 kg; se demostró una correlación significativa entre la edad, el peso y la hemoglobina. CONCLUSIÓN: se encontró que los pacientes con enfermedad renal crónica sometidos a hemodiálisis se encontraban en el percentil 10 de fuerza muscular, medido por dinamometría, lo que demuestra una disminución marcada de dicha fuerza muscular. Sin embargo, este resultado también podría verse afectado por diferentes variables, como la edad del paciente, la altura, el peso, la tasa de filtración glomerular (TFG), la concentración de hemoglobina, la creatinina sérica, la glucosa sérica y la evaluación global subjetiva, dado que se encontró una asociación significativa entre estos factores y la fuerza muscular


Assuntos
Humanos , Masculino , Feminino , Adulto Jovem , Adulto , Pessoa de Meia-Idade , Idoso , Idoso de 80 Anos ou mais , Força Muscular/fisiologia , Índice de Massa Corporal , Diálise Renal , Debilidade Muscular/etiologia , Dinamômetro de Força Muscular , Insuficiência Renal Crônica/epidemiologia , Perda de Peso , México/epidemiologia , Estudos Transversais , Antropometria , Modelos Lineares
6.
Artigo em Inglês | MEDLINE | ID: mdl-32933119

RESUMO

This study examined the effects of a person-centered nursing intervention program for frailty (PNIF) targeting community-dwelling prefrail older people in South Korea. The study participants were 40 community-dwelling older adults (≥65 years) who were classified as prefrail on the Cardiovascular Health Study (CHS) frailty index. The intervention group (n = 20) received group intervention sessions two days/week for twelve weeks and the control group (n = 20) attended lectures about frailty prevention one day/week for four weeks. The evaluation instruments included the CHS Frailty Index, a JAMAR® hydraulic hand dynamometer, the Short Physical Performance Battery (SPPB), the Korean version of the Community Healthy Activities Model Program for Seniors Questionnaire (K-CHAMPS), the Mini Nutritional Assessment (MNA), the Geriatric Depression Scale Short Form-Korea Version (GDSSF-K), the ENRICHD Social Support Instrument (ESSI), and the Goal Attainment Scale (GAS). Significant differences were found in the CHS Frailty Index (p < 0.001), left-hand grip strength (p = 0.022), right-hand grip strength (p = 0.009), SPPB (p = 0.007), K-CHAMPS (p = 0.009), MNA (p = 0.018), and GDSSF-K (p = 0.001) between the two groups after 12 weeks. No significant between-group differences in ESSI scores were observed. The PNIF effectively improved grip strength, physical function, physical activity, and nutritional status, reduced depression, and prevented frailty among community-dwelling older adults.


Assuntos
Fragilidade/prevenção & controle , Avaliação Geriátrica/métodos , Força da Mão/fisiologia , Assistência Centrada no Paciente/métodos , Idoso , Idoso de 80 Anos ou mais , Feminino , Idoso Fragilizado , Humanos , Vida Independente , Masculino , Dinamômetro de Força Muscular , Avaliação de Programas e Projetos de Saúde , República da Coreia
7.
PLoS One ; 15(8): e0237842, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32866205

RESUMO

Isokinetic dynamometry is the gold standard for testing maximal strength in elite sport and rehabilitation settings. To be clinically useful, such tests should be valid and reliable. Despite some evidence regarding the relative test vs retest reliability of knee dynamometry, there is still a paucity of research regarding the absolute reliability parameters. The purpose of this study was to assess the absolute and relative intra-device reproducibility of isokinetic knee flexion and extension using the novel SMM iMoment dynamometer. A total of 19 participants (13 males and 6 females, aged 24 (2) years, height 178 (9) cm and weight 76 (11) kg) performed two identical knee isokinetic tests with at least a week of rest between measurements. Peak torque of knee extension and flexion were determined at 60°/s. Moderate (0.892) to excellent (0.988) relative reliability using the intraclass correlation coefficient (ICC) was obtained for peak knee torque. Absolute reliability assessed with a standard error of measurement (SEM %) was low, ranging from 2.54% to 6.93%, whereas the smallest real difference (SRD %) was moderate, ranging from 7.04% to 19.22%. Furthermore, there were no significant correlations between means and differences of two measurements, and Bland-Altman plots also showed no signs of heteroscedasticity. Our measurement protocol established the moderate to excellent reliability of the novel SMM iMoment isokinetic dynamometer. Therefore, this dynamometer can be applied in sport rehabilitation settings to measure maximal knee strength.


Assuntos
Joelho/fisiologia , Dinamômetro de Força Muscular , Fenômenos Biomecânicos , Feminino , Humanos , Masculino , Músculo Esquelético/fisiologia , Amplitude de Movimento Articular , Reprodutibilidade dos Testes , Torque , Adulto Jovem
8.
Rehabilitación (Madr., Ed. impr.) ; 54(3): 162-172, jul.-sept. 2020. tab, graf
Artigo em Espanhol | IBECS | ID: ibc-196732

RESUMO

OBJETIVO: Definir el papel del fenómeno de flexión-relajación (FR), valorado mediante ratios (FRR), como test diagnóstico para definir una situación de déficit (impairment) en pacientes con dolor lumbar crónico (DLC). MATERIAL Y MÉTODO: La muestra del estudio consta de 180 sujetos, 16 voluntarios sanos y 164 pacientes en situación de incapacidad laboral por DLC, que fueron remitidos consecutivamente desde enero de 2012 a diciembre de 2017 para su valoración al laboratorio de biomecánica de una mutua de accidentes de trabajo. Las evaluaciones consistieron en un test de dinamometría isométrica, una prueba cinemática y una valoración del fenómeno FR. Se establecieron unos criterios mínimos en la ejecución de los test para ser aceptados como pruebas válidas para el estudio. El estado de déficit lumbar o de recuperación clínica en un paciente se definió a partir de los test de dinamometría y de cinemática. La respuesta FR se valoró con los FRR. Se tomaron un total de 4 ratios diferentes para el análisis con curvas ROC. RESULTADOS: Se obtuvieron 86 pruebas válidas (16 clasificadas como déficit lumbar y 71 como casos recuperados). La mejor ratio obtiene un área bajo la curva ROC de 0,87, una S: 0,84 y una E: 0,87 para identificarlos y un valor predictivo positivo del 97%. CONCLUSIONES: El test FR guarda con las evaluaciones de dinamometría y de cinemática una alta coherencia para objetivar una situación de déficit, siendo este una prueba de fácil ejecución por parte de los pacientes con DLC


OBJECTIVE: To define the role of the flexion-relaxation phenomenon (FRP), assessed through ratios (FRR), as a diagnostic test to define impairment in patients with chronic low back pain (CLBP). MATERIAL AND METHOD: The study sample consisted of 180 participants (16 healthy volunteers and 164 patients on work disability due to CLBP), who were consecutively referred for evaluation at the Biomechanics Laboratory of a workplace accident insurance company from January 2012 to December 2017. The evaluations consisted of an isometric dynamometry test, a kinematic test and assessment of the FRP phenomenon. Minimum criteria were established in the performance of the tests for their acceptance as valid for the study. Lumbar impairment or clinical recovery was defined on the basis of the results of the dynamometry and kinematic tests. The FRP response was assessed with FRRs. A total of 4 different ratios were taken for analysis with ROC curves. RESULTS: A total of 86 valid tests were obtained (16 classified as lumbar impairment and 71 as recovered cases). The best ratio obtained an area under the ROC curve of 0.87, with a sensitivity of 0.84, a specificity of 0.87, and a positive predictive value of 97%. CONCLUSION: The FRP test, along with dynamometry and kinematic evaluations, is effective in identifying lumbar impairment and is the easiest test for patients with CLBP to perform


Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Resistência à Flexão/fisiologia , Relaxamento/fisiologia , Dor Lombar/diagnóstico , Dor Lombar/reabilitação , Dinamômetro de Força Muscular , Fenômenos Biomecânicos/fisiologia , Curva ROC , Sensibilidade e Especificidade , Estudos de Casos e Controles
9.
Apunts, Med. esport (Internet) ; 55(207): 89-95, jul.-sept. 2020. ilus, tab, graf
Artigo em Inglês | IBECS | ID: ibc-194709

RESUMO

INTRODUCTION: Age and sport specialization are two of the most important factors that can impact an athlete's flexibility, but their influence during adolescence in youth athletics hasn’t yet been investigated. MATERIAL AND METHODS: Retrospective analysis of the lower limb flexibility assessments in the athletics squad of a full-time sports academy in the Middle East for nine consecutive seasons (2006/07 to 2014/15). Flexibility data were analyzed for eight lower limb muscle groups (mean value±standard deviation) in four athletics events (throws, sprints & jumps, distance running and non-specialized) and seven age groups (categorized yearly from under 13 to above 18 years old). Total lower limb flexibility (TF) was calculated by summating all individual muscle group values and comparisons were made between age groups and athletics events with statistical significance set at p < 0.05. RESULTS: 127 adolescent athletes (age = 15.4 ± 1.8 years) completed, in total, 604 flexibility tests. No statistically significant differences between right and left were found for any muscle (p > 0.05). A weak inverse correlation (r = -0.21, p < 0.001) was found between age and TF, with no significant changes in hamstrings, adductors and hip flexors (p > 0.05). Throwers were found to be significantly less flexible (1091 ± 93) than distance runners (1227 ± 95), sprints & jumps (1186 ± 80) and non-specialized athletes (1178 ± 78); distance runners displayed greater hip external rotators flexibility than any other group (p < 0.01), and up to 78% more than throwers. CONCLUSIONS: this research confirmed that throwers were the least flexible of all events in youth athletics. Overall lower limb flexibility appears to decrease during adolescence, although hamstrings, adductors and hip flexors remained unchanged


No disponible


Assuntos
Humanos , Masculino , Criança , Adolescente , Atletas , Extremidade Inferior/fisiologia , Esforço Físico/fisiologia , Atletismo/fisiologia , Estudos Retrospectivos , Dinamômetro de Força Muscular , Análise de Variância
10.
Neurology ; 95(9): e1211-e1221, 2020 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-32611642

RESUMO

OBJECTIVE: We followed up patients with facioscapulohumeral muscular dystrophy (FSHD) with sequential examinations over 2 years to investigate whether inflammatory lesions always precede fat replacement, if inflammation can be resolved without muscle degeneration, and if inflammatory lesions in muscle are always followed by fat replacement. METHODS: In this longitudinal study of 10 sequential MRI assessments over 2.5 years, we included 10 patients with FSHD. We used MRI with short TI inversion recovery to identify regions of interest (ROIs) with hyperintensities indicating muscle inflammation. Muscle T2 relaxation time mapping was used as a quantitative marker of muscle inflammation. Dixon sequences quantified muscle fat replacement. Ten healthy controls were examined with a magnetic resonance scan once for determination of normal values of T2 relaxation time. RESULTS: We identified 68 ROIs with T2 elevation in the patients with FSHD. New ROIs with T2 elevation arising during the study had muscle fat content of 6.4% to 33.0% (n = 8) and 47.0% to 78.0% lesions that resolved (n = 6). ROIs with T2 elevation had a higher increase in muscle fat content from visits 1 to 10 (7.9 ± 7.9%) compared to ROIs with normal muscle T2 relaxation times (1.7 ± 2.6%; p < 0.0001). Severe T2 elevations were always followed by an accelerated replacement of muscle by fat. CONCLUSIONS: Our results suggest that muscle inflammation starts in mildly affected muscles in FSHD, is related to a faster muscle degradation, and continues until the muscles are completely fat replaced. CLINICALTRIALSGOV IDENTIFIER: NCT02159612.


Assuntos
Tecido Adiposo/diagnóstico por imagem , Inflamação/diagnóstico por imagem , Músculo Esquelético/diagnóstico por imagem , Distrofia Muscular Facioescapuloumeral/diagnóstico por imagem , Adulto , Progressão da Doença , Feminino , Humanos , Perna (Membro) , Estudos Longitudinais , Imagem por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Força Muscular , Dinamômetro de Força Muscular , Distrofia Muscular Facioescapuloumeral/fisiopatologia , Coxa da Perna , Teste de Caminhada
11.
Biodemography Soc Biol ; 65(3): 245-256, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32727277

RESUMO

Hand grip strength (GS) is a valid and reliable predictor of future morbidity and mortality and is considered a useful indicator of aging. In this paper, we use results from the genetic analysis in animal studies to evaluate associations for GS, frailty, and subsequent mortality among humans. Specifically, we use data from the Health and Retirement Survey (HRS) to investigate the association between three polymorphisms in a candidate frailty gene (Tiam1) and GS. Results suggest that the A allele in rs724561 significantly reduces GS among older adults in the US (b = -0.340; p < .006) and is significantly associated with self-reported weakness (b = 0.221; p = .036). This same polymorphism was weakly associated (one-tailed) with an increased risk of mortality (b = 1.091; p < .093) and adjustments for GS rendered this association statistically non-significant (b = 1.048; p < .361). Overall, our results provide tentative evidence that the Tiam1 gene may be associated with frailty development, but we encourage further studies.


Assuntos
Força da Mão/fisiologia , Mutação/genética , Mutação/fisiologia , Estresse Psicológico/genética , Idoso , Idoso de 80 Anos ou mais , Animais , Modelos Animais de Doenças , Feminino , Humanos , Masculino , Camundongos , Pessoa de Meia-Idade , Mortalidade , Dinamômetro de Força Muscular , Modelos de Riscos Proporcionais , Estresse Psicológico/fisiopatologia
12.
J Sports Sci ; 38(16): 1877-1885, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32508286

RESUMO

With potential implications for recovery and conditioning practices, the aim of this study was to assess the cumulative and residual response of angle specific eccentric knee flexor (eccKF) strength indices following soccer-specific activity. Thirteen semi-professional soccer players were therefore required to complete a 90-minute soccer-specific treadmill running. with eccKF isokinetic strength assessments completed pre-trial, immediately post-trial, and 48 hours post-trial. The strength assessments comprised the completion of 5 repetitions at angular velocities of 60 and 300 deg·s-1. Isokinetic data was analysed for measures of peak torque (PT), angle of peak torque (APT), functional range (FR), and angle specific torque (AST). Significant post-trial impairments were observed for measures of slow velocity PT60 (6.6%) and AST300 (12.5%). Further significant differences were observed 48 hours post-trial for PT300 (10.7%) and PT60 (12.8%) PT, APT60 (~15°), and AST300 (>13.6%). These data have implications for post exercise recovery monitoring and the prescription of recovery modalities and conditioning practices in the 2 days following match-play. The AST and APT responses highlight the importance of analysis of the entire strength-angle curve and at a range of angular velocities.


Assuntos
Joelho/fisiologia , Força Muscular/fisiologia , Corrida/fisiologia , Futebol/fisiologia , Adulto , Humanos , Masculino , Fadiga Muscular/fisiologia , Dinamômetro de Força Muscular , Músculo Esquelético/fisiologia , Fatores de Tempo , Torque , Adulto Jovem
13.
Artigo em Inglês | MEDLINE | ID: mdl-32560400

RESUMO

There is a strong need for a new, probably cheaper, smaller, and more portable isometric dynamometer. With this aim, we investigated the concurrent validity and reliability of a low-cost portable dynamometer to measure the isometric strength of the lower limb. Seventeen young participants (age 16.47 ± 0.51 years) were randomly assessed on three different days for knee flexion and extension isometric forces with two different devices: a commonly used isokinetic dynamometer (ISOC) and a portable isometric dynamometer prototype (ISOM). No significant differences were observed between the ISOC and the ISOM (all comparisons p > 0.05). Test-retest comparison showed the ISOM to have high reliability (ICC 0.879-0.990). This study showed that measurements with the ISOM could be performed without systematic bias and with high reliability. The ISOM is a device that is able to assess knee isometric strength with excellent concurrent validity and reliability.


Assuntos
Contração Isométrica , Dinamômetro de Força Muscular , Força Muscular , Humanos , Músculo Esquelético , Reprodutibilidade dos Testes
14.
Rev. int. med. cienc. act. fis. deporte ; 20(78): 369-380, jun. 2020. tab
Artigo em Espanhol | IBECS | ID: ibc-194788

RESUMO

Se analiza la influencia que tienen las variables cineantropométricas y dinamométricas sobre el test Sit and Reach en deportistas amateur. Se tomaron veinte variables antropométricas, cuatro pruebas de dinamometría, el test Sit and Reach y la actividad física realizada. Encontramos diferencias significativas en los valores de flexibilidad entre hombres y mujeres. Las ecuaciones de predicción fueron diferentes en hombres y en mujeres (30.6% y 32.5%), en las mujeres apareció la talla como factor influyente. La ecuación general de predicción calculada se obtiene un 39,1% (moderada). Hombres y mujeres se diferencian significativamente en todas las variables antropométricas excepto en pliegue subescapular y suprailiaco. ¿Qué otros factores influirían sobre una posible predicción del resultado? Los valores de flexibilidad no se consideran influenciados por las variables antropométricas, dinamométricas y la tipología de actividad física realizada. El índice de fuerza no correlaciona con el valor del test Sit and Reach


Analyzes the influence of kinanthropometric and dynamometric variables on the Sit and Reach test in amateur athletes. We used twenty anthropometric variables, four dynamometry tests, the Sit and Reach test and the amount of physical activity practiced. Significant differences were found between men and women in terms of flexibility levels. The prediction equations were differed according to gender (30.6% men and 32.5% women), height being an influential factor in women. The general prediction equation calculated, the level is 39.1% (moderate). Men and women show significant differences in all anthropometric variables except subscapular and suprailiac skinfolds. What other factors influence the kind of results that can be expected? The results of the flexibility test are not influenced by the anthropometric and dynamometric variables, or by the type of physical activity performed. The strength index does not correlate with the Sit and Reach test value


Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto Jovem , Adulto , Pessoa de Meia-Idade , Idoso , Antropometria , Dinamômetro de Força Muscular , Atividade Motora , Teste de Esforço/normas , Músculo Esquelético/fisiologia , Análise de Regressão , Teste de Esforço/métodos , Esportes/fisiologia
15.
Artigo em Inglês | MEDLINE | ID: mdl-32384713

RESUMO

Background: Handgrip strength (HGS) is a convent measure of strength capacity and associated with several age-related health conditions such as functional disability. Asymmetric strength between limbs has been linked to diminished function. Therefore, both HGS asymmetry and weakness could be associated with functional disability. We examined the associations of HGS asymmetry and weakness on functional limitations in a nationally representative sample of older Americans. Methods: Data were analyzed from 2689 adults ≥ 60 years who participated in the 2011-2012 and 2013-2014 waves of the National Health and Nutrition Examination Survey. Weakness was defined as HGS < 26 kg for men and < 16 kg for women. Asymmetry was determined from the ratio of the dominant and non-dominant HGS. Those with HGS ratio 0.9-1.1 were considered as having HGS symmetry, and those outside this range had asymmetry. Results: Compared to those with symmetric HGS and were not weak, those with weakness alone, and both weakness and HGS asymmetry had 2.47 (95% confidence interval [CI]: 1.14-5.35) and 3.93 (CI: 1.18-13.07) greater odds for functional limitations, respectively. However, HGS asymmetry alone was not associated with functional limitations (odds ratio: 0.80; CI: 0.62-1.03). Conclusion: The use of HGS asymmetry in protocols could improve the prognostic value of handgrip dynamometers.


Assuntos
Avaliação Geriátrica/métodos , Força da Mão/fisiologia , Força Muscular/fisiologia , Debilidade Muscular/fisiopatologia , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Dinamômetro de Força Muscular , Razão de Chances , Estados Unidos
16.
Neurology ; 94(24): e2508-e2520, 2020 06 16.
Artigo em Inglês | MEDLINE | ID: mdl-32457208

RESUMO

OBJECTIVE: To investigate intrarater reliability and concurrent and construct validity of muscle strength, balance, and functional mobility measures in individuals with noncongenital myotonic dystrophy type 1 (DM1). METHODS: Seventy-eight adults with noncongenital DM1 participated in visit 1, and 73 of the them participated in visit 2 separated by 1 to 2 weeks. The assessments consisted of muscle strength tests with handheld dynamometry (HHD) and stationary dynamometry in the lower limb. The balance tests consisted of the step test, Timed Up and Go test, feet-together stance, tandem stance, 1-leg stance, and modified Clinical Test of Sensory Integration and Balance on a balance platform. The functional mobility tests consisted of the 10-m walk test (10mWT) and 10-times Sit-to-Stand test. RESULTS: The HHD and stationary dynamometry had sufficient intrarater reliability for most muscle groups on a group (SEM% ≤15%) and individual (minimal detectable difference [MDD95%] ≤30%) level, but the HHD was most reliable. Stationary dynamometry measured a higher torque than HHD for all extensor muscles, but for single individuals, none of the devices were favored. Overall, intrarater reliability and validity were sufficient only for the dynamic balance tests, not the static balance tests. Both functional mobility tests were sufficiently reliable and valid, but the 10mWT was most reliable. CONCLUSION: Overall, HHD is recommended as a reliable and valid tool for single individuals and for flexor muscles on a group level. For balance assessments, the dynamic balance tests are recommended as the most valid and reliable balance tests. Both functional mobility tests are recommended for valid and reliable outcomes, but the 10mWT was superior for reliability.


Assuntos
Distrofia Miotônica/fisiopatologia , Adulto , Idoso , Estudos de Coortes , Teste de Esforço , Feminino , Força da Mão , Humanos , Extremidade Inferior/fisiopatologia , Masculino , Pessoa de Meia-Idade , Limitação da Mobilidade , Força Muscular , Dinamômetro de Força Muscular , Distrofia Miotônica/terapia , Variações Dependentes do Observador , Equilíbrio Postural , Reprodutibilidade dos Testes , Resultado do Tratamento , Teste de Caminhada
17.
Actual. osteol ; 16(1): 26-34, Ene - abr. 2020. ilus, graf
Artigo em Espanhol | LILACS | ID: biblio-1130074

RESUMO

La expansión modeladora de la geometría cortical de un hueso inducida por su entorno mecánico podría ser difícil de modificar por estímulos ulteriores con diferente direccionalidad. Este estudio, que por primera vez combina datos tomográficos del peroné (pQCT) y dinamométricos de la musculatura peronea lateral, intenta demostrar que, en individuos jóvenes no entrenados, el entrenamiento en fútbol produce cambios geométricos peroneos expansivos, similares a los del rugby, que podrían interferir en los efectos de un entrenamiento ulterior direccionalmente diferente (carrera larga). Confirmando la hipótesis, los resultados indican, con evidencias originales, 1) la relevancia creciente del uso del pie (rotación externa y eversión provocadas por los peroneos laterales) para la determinación de la geometría peronea (incremento del desarrollo de los indicadores de masa y de diseño óseos), evidenciada por la secuencia creciente de efectos: carrera < fútbol < rugby; 2) la predominancia de esos efectos sobre el desarrollo centro-proximal del peroné para resistir a la flexión lateral, y en la región distal para resistir el buckling (principal sitio y causa de fractura del hueso) y 3.) la relevancia de la anticipación de esos efectos para interferir en la manifestación de los cambios producidos por un entrenamiento ulterior (carrera), cuando los del primero (fútbol) afectan la modelación cortical de modo expansivo. Esta última deducción demuestra, en forma inédita, que un cambio modelatorio expansivo tempranamente inducido sobre la estructura cortical ósea 'delimitaría el terreno'para la manifestación de cualquier otro efecto ulterior por estímulos de distinta direccionalidad. (AU)


The modeling-dependent, geometrical expansion of cortical bone induced by the mechanical environment could be hard to modify by subsequent stimulations with a different directionality. The current study aimed to demonstrate that in young, untrained individuals, training in soccer or rugby enhances the geometric properties of the fibula cortical shell in such a way that the geometrical changes could interfere on the effects of a second training in which the loads are induced in a different direction, e.g. long-distance running. The original findings reported herein confirm our hypothesis and support 1) The relevance of the use of the foot (external rotation and eversion produced by peroneus muscles) to determine fibula geometry (improved development of indicators of bone mass and design) as evidenced by the increasing nature of the effects induced by running < soccer < rugby trainings; 2) The predominance of those effects on the ability of the fibula to resist lateral bending in the centralproximal region (insertion of peroneus muscles), and to resist buckling in the distal region (the main cause and site of the most frequent bone fractures), and 3) The interaction of the effects of a previous training with those of a subsequent training with a different orientation of the loads when the former induced a modeling-dependent expansion of the cortex. Our results support the proposed hypothesis with original arguments by showing that a first, expansive effect induced on cortical bone modeling would set the stage the manifestation of any subsequent effect derived from mechanical stimuli. (AU)


Assuntos
Humanos , Masculino , Adolescente , Adulto , Adulto Jovem , Exercício Físico/fisiologia , Fíbula/crescimento & desenvolvimento , Corrida/fisiologia , Futebol/fisiologia , Esportes/fisiologia , Tomografia , Densidade Óssea , Fraturas Ósseas/prevenção & controle , Força Muscular/fisiologia , Dinamômetro de Força Muscular , Fíbula/diagnóstico por imagem , Osso Cortical/diagnóstico por imagem , Pé/crescimento & desenvolvimento , Pé/fisiologia , Pé/diagnóstico por imagem , Futebol Americano/fisiologia
18.
Percept Mot Skills ; 127(4): 671-683, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32216527

RESUMO

The present study aimed to evaluate the influence of holding the chair handles during the assessment of older women's knee flexion and extension isokinetic and isometric strength. Of 57 older women (≥60 years) selected from a convenience sample for this research, 23 were randomly chosen to perform the tests twice for reliability analyses. Each participant performed maximal isokinetic knee extension and flexion at 60°/s and 180°/s angular velocities and isometric tests under two conditions: (a) holding the lateral handle of the chair (HOLD) and (b) supporting the hands on the shoulders with the arms crossed (i.e., not holding the handle [NHOLD]). Participants performed significantly better in the HOLD compared with the NHOLD condition. Slightly lower intraclass correlation coefficients (ICC = 0.870-0.956) were noted for the HOLD than for the NHOLD condition (ICC = 0.900-0.981) so that the HOLD performance on Days 1 and 2 was different on some measures. Owing to the higher reliability coefficients in the NHOLD condition, results suggest that, when assessing knee strength in older women, the evaluee should place their hands over their shoulders with arms crossed in front of the chest (NHOLD) to maximize assessment reliability (reproducibility of performance).


Assuntos
Força da Mão/fisiologia , Articulação do Joelho/fisiologia , Força Muscular/fisiologia , Músculo Esquelético/fisiologia , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Pessoa de Meia-Idade , Dinamômetro de Força Muscular , Amplitude de Movimento Articular/fisiologia
19.
Phys Ther Sport ; 43: 127-133, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32146433

RESUMO

OBJECTIVES: To compare ankle, knee and hip isometric peak torque between young and middle-aged adults with CAI, copers and un-injured controls. DESIGN: Cross-sectional. SETTING: Research Laboratory. PARTICIPANTS: One hundred fifty-six young and middle-aged adults with or without CAI volunteered. MAIN OUTCOME MEASURES: A handheld dynamometer measured isometric dorsiflexion, plantarflexion, knee extension, hip extension and hip abduction peak force during a 5 s trial. Average peak torque was calculated and normalized to body mass. RESULTS: A significant Age by Injury interaction for dorsiflexion suggest middle-aged un-injured controls (p < 0.001) and copers (p < 0.001) had lower isometric peak torque compared to their young adult counterparts, but there were no differences between young and middle-aged adults with CAI (p > 0.05). Significant Injury main effects suggest the CAI group had decreased plantarflexion (p = 0.004) and hip extension (p = 0.010) strength compared to un-injured controls, but not copers (p > 0.05). Significant Age main effects for all primary outcome measures were observed, indicating peak torque decreased with age (p < 0.05). CONCLUSIONS: Regardless of age, isometric ankle and hip peak torque was lower in participants with CAI compared to un-injured controls, but not copers. These findings provide further evidence towards the impact of CAI in both young and middle-aged adults.


Assuntos
Adaptação Psicológica , Articulação do Tornozelo/fisiopatologia , Articulação do Quadril/fisiopatologia , Contração Isométrica/fisiologia , Instabilidade Articular/fisiopatologia , Adolescente , Adulto , Idoso , Doença Crônica , Estudos Transversais , Feminino , Humanos , Instabilidade Articular/psicologia , Masculino , Pessoa de Meia-Idade , Dinamômetro de Força Muscular , Adulto Jovem
20.
Muscle Nerve ; 62(1): 76-82, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-32134516

RESUMO

INTRODUCTION: Objective information on longitudinal disease progression in inclusion body myositis (IBM) is lacking. METHODS: Longitudinal dynamometry and functional status data were collated from a cohort of IBM patients. Annual change was calculated by means of linear modeling. Trajectories of change in grip, knee extension, IBM Functional Rating Scale (IBM-FRS) and Neuromuscular Symptom Score (NSS) were identified by means of latent growth mixture modeling. RESULTS: Data were collated from 75 IBM patients (348 person-years follow-up). Annual strength loss was greatest for pinch (-10%) and knee extension (-4%). Functional deterioration was greatest for males. Three distinct trajectory groups were identified. Rapid deterioration trajectory for grip strength was associated with younger diagnosis age. Rapid deterioration for knee extension strength was associated with older age of diagnosis. DISCUSSION: This study has quantified strength change in IBM and identified distinct trajectory groups, which will aid prognostication and stratification for inclusion into future clinical trials.


Assuntos
Progressão da Doença , Dinamômetro de Força Muscular/tendências , Força Muscular/fisiologia , Miosite de Corpos de Inclusão/diagnóstico , Miosite de Corpos de Inclusão/fisiopatologia , Idoso , Idoso de 80 Anos ou mais , Estudos de Coortes , Feminino , Seguimentos , Força da Mão/fisiologia , Humanos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Músculo Esquelético/fisiologia , Estudos Prospectivos
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