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1.
Trop Med Int Health ; 29(5): 405-413, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38503276

RESUMO

OBJECTIVE: Inspiratory muscle strength (IMS) appears to be reduced in subjects with chronic Chagas heart disease (CHD), especially in the presence of heart failure (HF). However, only one study about IMS and inspiratory muscle endurance (IME) in those with CHD without heart failure is available. This study aimed to compare IMS and IME in subjects with CHD in the presence and absence of HF. METHODS: This is a cross-sectional study in which 30 CHD adult patients were divided into CHD-CC group (initial phase of CHD, without HF; n = 15) and CHD-HF group (advanced phase of CHD, with HF; n = 15). We assessed IMS by maximum inspiratory pressure (MIP) and IME by incremental (Pthmax) and constant load (TLim) tests. Reduced IMS and IME were considered by predicted MIP values <70% and Pthmax/MIP <75%, respectively. RESULTS: Inspiratory muscle weakness (IMW) was more frequent in CHD-HF than in CHD-CC (46.7% vs. 13.3%; p = 0.05), and both groups had high frequencies of reduced IME (93.3% CHD-CC vs. 100.0% CHD-HF; p = 0.95). Age-adjusted logistic regression analysis using HF as a dependent variable showed that HF was associated with an increased chance of IMW compared with the CHD-CC group (OR = 7.47; p = 0.03; 95% CI 1.20-46.19). CONCLUSION: This study suggests that, in patients with CHD, HF is associated with IMW, and that reduction of IME is already present in the initial phase, similar to the advanced phase with HF.


Assuntos
Cardiomiopatia Chagásica , Músculos Respiratórios , Humanos , Estudos Transversais , Masculino , Feminino , Pessoa de Meia-Idade , Músculos Respiratórios/fisiopatologia , Cardiomiopatia Chagásica/fisiopatologia , Adulto , Doença Crônica , Insuficiência Cardíaca/fisiopatologia , Força Muscular/fisiologia , Inalação/fisiologia , Debilidade Muscular/fisiopatologia , Resistência Física , Idoso
2.
Arch Phys Med Rehabil ; 105(6): 1099-1105, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38272247

RESUMO

OBJECTIVES: To investigate muscle strength and the prevalence of muscle weakness in adults with interstitial lung diseases (ILDs) compared to healthy subjects. DESIGN: Cross-sectional (description of clinical features). SETTING: Public referral center (University Hospital). PARTICIPANTS: One hundred and twelve adults with ILD (n=48, 60±10yr, 68% female) and healthy counterparts (control group, n=64, 57±10yr, 58% female) (N=112). INTERVENTION: Not applicable. MAIN OUTCOME MEASURE(S): Muscle strength and prevalence of muscle weakness in adults with ILD. Muscle strength was assessed via maximal isometric voluntary contraction of dominant upper and lower limb muscle groups. Data from the control group were used to generate reference equations. Muscle weakness was defined as a muscle strength value below the lower limit of normal calculated using data from the control group. Data were expressed as mean ± SD or median [interquartile range] according to the data distribution. RESULTS: Compared to the control group, adults with ILD had lower muscle strength for all muscle groups assessed (values presented as %predicted: pectoralis major 75[57-86]%; quadriceps 72[58-87]%; latissimus dorsi 76[57-103]%; deltoid 74[64-98]%; biceps brachii 78[64-91]%; triceps brachii 84[62-101]%; P≤.001 for all). Prevalence of muscle weakness in people with ILD was 40% for pectoralis major, 25% for latissimus dorsi, 16% for triceps brachii, 20% for biceps brachii, 27% for deltoid and 46% for quadriceps. CONCLUSIONS: Adults with ILD present a generalised reduction in peripheral Muscle strength, ranging between 20% to 46% of people depending on the muscle group assessed. and it was more prevalent in lower limb muscles.


Assuntos
Doenças Pulmonares Intersticiais , Força Muscular , Debilidade Muscular , Humanos , Feminino , Masculino , Doenças Pulmonares Intersticiais/fisiopatologia , Estudos Transversais , Pessoa de Meia-Idade , Força Muscular/fisiologia , Debilidade Muscular/fisiopatologia , Idoso , Contração Isométrica/fisiologia , Músculo Esquelético/fisiopatologia , Estudos de Casos e Controles , Prevalência
3.
Nephrology (Carlton) ; 29(6): 354-362, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38350237

RESUMO

AIM: Patients undergoing haemodialysis have reduced muscle strength and impaired activities of daily living (ADL). We examined possible relationship between difficult ADL and corresponding muscle weakness in elderly haemodialysis patients. METHODS: This was a single-centre, cross-sectional study. Patient-reported ADL difficulty was examined using a questionnaire in six ADL using upper limbs (eating, grooming and dressing) and lower limbs (bathing, toileting and locomotion). We measured six muscle strengths by dynamometers of shoulder flexion, shoulder abduction, elbow flexion, handgrip, hip abduction and knee extension. The muscle strength with the lowest Z-score was considered as the weakest muscle strength for the patient. RESULTS: The six scores of ADL difficulty were all inversely associated with the six muscle strengths in the 81 total participants of whom 71 individuals (87.7%) had any ADL difficulty. Among the six measurements of muscle strength, handgrip strength showed the highest associations with all ADL difficulties. In 25 patients who perceived that the most difficult ADL was an activity using upper limbs, the common weakest muscle strengths were the hip abduction, handgrip and elbow flexion. In 44 patients who perceived that the most difficult ADL was an activity using lower limbs, knee extension was the most prevalent weakest muscle strength. CONCLUSION: This study suggested preferential relationship between the most difficult ADL and corresponding muscle weakness in elderly haemodialysis patients. This finding may be useful in prevention and treatment.


Assuntos
Atividades Cotidianas , Força Muscular , Debilidade Muscular , Diálise Renal , Humanos , Diálise Renal/efeitos adversos , Debilidade Muscular/fisiopatologia , Debilidade Muscular/etiologia , Debilidade Muscular/diagnóstico , Masculino , Feminino , Idoso , Estudos Transversais , Idoso de 80 Anos ou mais , Força da Mão
4.
Eur J Appl Physiol ; 124(7): 2123-2137, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38421430

RESUMO

PURPOSE: Many modern-day children are at risk of pediatric dynapenia (muscle weakness). We examined the effects of a 12-week resistance training (RT) program on neuromuscular function and body composition parameters in pubertal children with a risk of dynapenia. METHODS: Twelve children (13.4 ± 0.9 y) with dynapenia performed a progressive RT program consisting of knee extension and flexion, bench press, abdominal crunch, back extension, lateral pull-down, elbow flexion, and upright row (1-2 sets of 10-15 repetitions/exercise) twice/week for 12 weeks. Outcome measures included one-repetition maximum (1-RM) strength, maximal voluntary isometric contraction (MVIC) torque, rate of torque development (RTD), electromyographic (EMG) activity, muscle thickness (MT), muscle quality (MQ) assessed by echo intensity (MQEI) of the knee extensors and specific tension of MVIC torque to thigh fat-free mass (MQST), and total and regional body and bone composition assessed by dual-energy X-ray absorptiometry. Changes in the measures before and after the 12-week RT and associations among the measures were analyzed by linear mixed models. RESULTS: Significant (p < 0.05) increases in 1-RM (63.9 ± 4.5%), MVIC torque (16.3 ± 17.8%), MT (18.8 ± 5.5%) and MQ (MQEI: -25.9 ± 15.2%; MQST: 15.1 ± 18.8%;) were evident from pre- to post-training. Total fat-free mass (FFM) increased by 2.3 ± 3.2% from baseline (p = 0.01), but no changes (p > 0.05) in the other measures were observed. Significant (p < 0.05) associations between the changes in 1-RM and/or MVIC torque and the changes in quadriceps MT, MQEI, MQST and total body FFM were evident. CONCLUSIONS: The 12-week RT was effective for improving neuromuscular and body composition parameters, and thereby reversed the risk of pediatric dynapenia.


Assuntos
Treinamento Resistido , Humanos , Treinamento Resistido/métodos , Masculino , Feminino , Adolescente , Debilidade Muscular/fisiopatologia , Músculo Esquelético/fisiologia , Força Muscular/fisiologia , Composição Corporal/fisiologia , Criança , Puberdade/fisiologia , Contração Isométrica/fisiologia
5.
Br J Sports Med ; 58(9): 500-510, 2024 Apr 25.
Artigo em Inglês | MEDLINE | ID: mdl-38537939

RESUMO

OBJECTIVE: We aimed to determine hip and lower-leg muscle strength in people after ACL injury compared with an uninjured control group (between people) and the uninjured contralateral limb (between limbs). DESIGN: Systematic review with meta-analysis. DATA SOURCES: MEDLINE, EMBASE, CINAHL, Scopus, Cochrane CENTRAL and SportDiscus to 28 February 2023. ELIGIBILITY CRITERIA: Primary ACL injury with mean age 18-40 years at time of injury. Studies had to measure hip and/or lower-leg muscle strength quantitatively (eg, dynamometer) and report muscle strength for the ACL-injured limb compared with: (i) an uninjured control group and/or (ii) the uninjured contralateral limb. Risk of bias was assessed according to Cochrane Collaboration domains. RESULTS: Twenty-eight studies were included (n=23 measured strength ≤12 months post-ACL reconstruction). Most examined hip abduction (16 studies), hip extension (12 studies) and hip external rotation (7 studies) strength. We found no meaningful difference in muscle strength between people or between limbs for hip abduction, extension, internal rotation, flexion or ankle plantarflexion, dorsiflexion (estimates ranged from -9% to +9% of comparator). The only non-zero differences identified were in hip adduction (24% stronger on ACL limb (95% CI 8% to 42%)) and hip external rotation strength (12% deficit on ACL limb (95% CI 6% to 18%)) compared with uninjured controls at follow-ups >12 months, however both results stemmed from only two studies. Certainty of evidence was very low for all outcomes and comparisons, and drawn primarily from the first year post-ACL reconstruction. CONCLUSION: Our results do not show widespread or substantial muscle weakness of the hip and lower-leg muscles after ACL injury, contrasting deficits of 10%-20% commonly reported for knee extensors and flexors. As it is unclear if deficits in hip and lower-leg muscle strength resolve with appropriate rehabilitation or no postinjury or postoperative weakness occurs, individualised assessment should guide training of hip and lower-leg strength following ACL injury. PROSPERO REGISTRATION NUMBER: CRD42020216793.


Assuntos
Lesões do Ligamento Cruzado Anterior , Quadril , Força Muscular , Humanos , Força Muscular/fisiologia , Lesões do Ligamento Cruzado Anterior/cirurgia , Lesões do Ligamento Cruzado Anterior/fisiopatologia , Perna (Membro) , Reconstrução do Ligamento Cruzado Anterior/reabilitação , Músculo Esquelético/fisiopatologia , Músculo Esquelético/fisiologia , Debilidade Muscular/etiologia , Debilidade Muscular/fisiopatologia
6.
Sensors (Basel) ; 24(11)2024 Jun 03.
Artigo em Inglês | MEDLINE | ID: mdl-38894392

RESUMO

We assessed the feasibility of implementing a virtually guided Neuromuscular Electrical Stimulation (NMES) protocol over the tibialis anterior (TA) muscle while collecting heart rate (HR), Numeric Pain Rating Scale (NPRS), and quality of contraction (QoC) data. We investigated if HR, NPRS, and QoC differ ON and OFF the TA motor point and explored potential relationships between heart rate variability (HRV) and the NPRS. Twelve healthy adults participated in this cross-sectional study. Three NMES trials were delivered ON and OFF the TA motor point. HR, QoC, and NPRS data were collected. There was no significant difference in HRV ON and OFF the motor point (p > 0.05). The NPRS was significantly greater OFF the motor point (p < 0.05). The QoC was significantly different between motor point configurations (p < 0.05). There was no correlation between the NPRS and HRV (p > 0.05, r = -0.129). We recommend non-electrical methods of measuring muscle activity for future studies. The NPRS and QoC can be administered virtually. Time-domain HRV measures could increase the validity of the protocol. The variables should be explored further virtually to enhance the protocol before eventual ICU studies.


Assuntos
Estimulação Elétrica , Frequência Cardíaca , Contração Muscular , Humanos , Masculino , Projetos Piloto , Adulto , Feminino , Estimulação Elétrica/métodos , Contração Muscular/fisiologia , Frequência Cardíaca/fisiologia , Debilidade Muscular/fisiopatologia , Debilidade Muscular/diagnóstico , Estudos Transversais , Unidades de Terapia Intensiva , Músculo Esquelético/fisiologia , Adulto Jovem , Biomarcadores/análise
7.
J Strength Cond Res ; 38(7): e398-e404, 2024 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-38595265

RESUMO

ABSTRACT: McGrath, R, McGrath, BM, Jurivich, D, Knutson, P, Mastrud, M, Singh, B, and Tomkinson, GR. Collective weakness is associated with time to mortality in Americans. J Strength Cond Res 38(7): e398-e404, 2024-Using new weakness cutpoints individually may help estimate time to mortality, but their collective use could improve value. We sought to determine the associations of (a) each absolute and body size normalized cut point and (b) collective weakness on time to mortality in Americans. The analytic sample included 14,178 subjects aged ≥50 years from the 2006-2018 waves of the Health and Retirement Study. Date of death was confirmed from the National Death Index. Handgrip dynamometry measured handgrip strength (HGS). Men were categorized as weak if their HGS was <35.5 kg (absolute), <0.45 kg·kg -1 (body mass normalized), or <1.05 kg·kg -1 ·m -2 (body mass index [BMI] normalized). Women were classified as weak if their HGS was <20.0 kg, <0.337 kg·kg -1 , or <0.79 kg·kg -1 ·m -2 . Collective weakness categorized persons as below 1, 2, or all 3 cutpoints. Cox proportional hazard regression models were used for analyses. Subject values below each absolute and normalized cutpoint for the 3 weakness parameters had a higher hazard ratio for early all-cause mortality: 1.45 (95% confidence interval [CI]: 1.36-1.55) for absolute weakness, 1.39 (CI: 1.30-1.49) for BMI normalized weakness, and 1.33 (CI: 1.24-1.43) for body mass normalized weakness. Those below 1, 2, or all 3 weakness cut points had a 1.37 (CI: 1.26-1.50), 1.47 (CI: 1.35-1.61), and 1.69 (CI: 1.55-1.84) higher hazard for mortality, respectively. Weakness determined by a composite measure of absolute and body size adjusted strength capacity provides robust prediction of time to mortality, thus potentially informing sports medicine and health practitioner discussions about the importance of muscle strength during aging.


Assuntos
Força da Mão , Debilidade Muscular , Humanos , Masculino , Feminino , Força da Mão/fisiologia , Idoso , Pessoa de Meia-Idade , Debilidade Muscular/mortalidade , Debilidade Muscular/fisiopatologia , Estados Unidos/epidemiologia , Mortalidade , Índice de Massa Corporal , Idoso de 80 Anos ou mais , Modelos de Riscos Proporcionais , Tamanho Corporal/fisiologia
8.
Harefuah ; 163(6): 376-381, 2024 Jun.
Artigo em Hebraico | MEDLINE | ID: mdl-38884292

RESUMO

INTRODUCTION: Fibromyalgia syndrome (FMS) is a chronic pain syndrome, prevalent in women more than men. The main symptoms are widespread musculoskeletal pain, fatigue, and weakness. To date, the pathophysiological mechanisms are unclear, and there are several pathogenic theories elucidating this condition. In this review, we summarized articles published in the past few years, regarding the effect of musculoskeletal dysfunction on FMS. We focused on the musculoskeletal system and central nervous system (CNS) disarrays.


Assuntos
Fibromialgia , Fibromialgia/fisiopatologia , Humanos , Feminino , Masculino , Fadiga/fisiopatologia , Fadiga/etiologia , Dor Crônica/fisiopatologia , Dor Crônica/etiologia , Sistema Nervoso Central/fisiopatologia , Dor Musculoesquelética/fisiopatologia , Dor Musculoesquelética/etiologia , Debilidade Muscular/fisiopatologia , Debilidade Muscular/etiologia
9.
Arch Endocrinol Metab ; 68: e230026, 2024 05 06.
Artigo em Inglês | MEDLINE | ID: mdl-38709150

RESUMO

Muscle weakness has been associated to insulin resistance and metabolic syndrome in the general population. However, it is still unclear whether this association is maintained in older adults. This study investigated correlations between low handgrip strength (HGS) and metabolic syndrome, or some of its components, in older adults through a systematic review of the literature. Searches were conducted in the Virtual Health Library Regional Portal, Scopus, Cochrane, Embase, MEDLINE/ PubMed, SciELO, and Web of Science databases for relevant studiesinvestigating muscle weakness (measured by hand dynamometer) and metabolic syndrome or its components in older adult populations, published up to September 2023. From the 2050 references initially identified, 20 studies, comprising a total of 31,264 older adults of both genders, completely met the inclusion/exclusion criteria. Eighteen studies showed that lower HGS was associated with metabolic syndrome or some of its risk factors, such as abdominal obesity, hyperglycemia, insulin resistance, dyslipidemia, or high blood pressure. Two studies found that older men with high blood pressure had increased HGS. Most studies included in this systematic review revealed a significant correlation between reduced HGS and metabolic syndrome or some of its components, especially abdominal obesity and insulin resistance. We conclude that below-average HGS can be associated with metabolic syndrome in older adults.


Assuntos
Força da Mão , Síndrome Metabólica , Humanos , Síndrome Metabólica/fisiopatologia , Força da Mão/fisiologia , Idoso , Masculino , Feminino , Debilidade Muscular/fisiopatologia , Fatores de Risco , Resistência à Insulina/fisiologia
10.
Artigo em Inglês | MEDLINE | ID: mdl-38709603

RESUMO

Neck muscle weakness due to amyotrophic lateral sclerosis (ALS) can result in dropped head syndrome, adversely impacting the quality of life of those affected. Static neck collars are currently prescribed to hold the head in a fixed upright position. However, these braces are uncomfortable and do not allow any voluntary head-neck movements. By contrast, powered neck exoskeletons have the potential to enable head-neck movements. Our group has recently improved the mechanical structure of a state-of-the-art neck exoskeleton through a weighted optimization. To evaluate the effect of the structural changes, we conducted an experiment in which patients with ALS were asked to perform head-neck tracking tasks while using the two versions of the neck exoskeleton. We found that the neck muscle activation was significantly reduced when assisted by the structurally enhanced design compared to no assistance provided. The improved structure also improved kinematics tracking performance, allowing users to better achieve the desired head poses. In comparison, the previous design did not help reduce the muscle effort required to perform these tasks and even slightly worsened the kinematic tracking performance. It was also found that biomechanical benefits gained from using the structurally improved design were consistent across participants with both mild and severe neck weakness. Furthermore, we observed that participants preferred to use the powered neck exoskeletons to voluntarily move their heads and make eye contact during a conversation task rather than remain in a fixed upright position. Each of these findings highlights the importance of the structural design of neck exoskeletons in achieving desired biomechanical benefits and suggests that neck exoskeletons can be a viable method to improve the daily life of patients with ALS.


Assuntos
Esclerose Lateral Amiotrófica , Exoesqueleto Energizado , Músculos do Pescoço , Humanos , Esclerose Lateral Amiotrófica/fisiopatologia , Masculino , Feminino , Pessoa de Meia-Idade , Músculos do Pescoço/fisiopatologia , Fenômenos Biomecânicos , Idoso , Eletromiografia , Movimentos da Cabeça , Pescoço/fisiopatologia , Desenho de Equipamento , Adulto , Debilidade Muscular/fisiopatologia
11.
J Sport Health Sci ; 13(3): 419-427, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38219958

RESUMO

BACKGROUND: Pediatric cancer survivors are at increased risk of muscle weakness and low areal bone mineral density (aBMD). However, the prevalence of muscle strength deficits is not well documented, and the associations of muscle strength with aBMD are unknown in this population. Therefore, this study aimed to investigate the prevalence of upper- and lower-body muscle strength deficits and to examine the associations of upper- and lower-body muscle strength with age-, sex, and race-specific aBMD Z-scores at the total body, total hip, femoral neck, and lumbar spine. METHODS: This cross-sectional study included 116 pediatric cancer survivors (12.1 ± 3.3 years old, mean ± SD; 42.2% female). Upper- and lower-body muscle strength were assessed by handgrip and standing long jump test, respectively. Dual­energy X­ray absorptiometry was used to measure aBMD (g/cm2). Associations between muscle strength and aBMD were evaluated in multivariable linear regression models. Logistic regression was used to evaluate the contribution of muscle strength (1-decile lower) to the odds of having low aBMD (Z-score ≤ 1.0). All analyses were adjusted for time from treatment completion, radiotherapy exposure, and body mass index. RESULTS: More than one-half of survivors were within the 2 lowest deciles for upper- (56.9%) and lower- body muscle strength (60.0%) in comparison to age- and sex-specific reference values. Muscle strength deficits were associated with lower aBMD Z-scores at all sites (B = 0.133-0.258, p = 0.001-0.032). Each 1-decile lower in upper-body muscle strength was associated with 30%-95% higher odds of having low aBMD Z-scores at all sites. Each 1-decile lower in lower-body muscle strength was associated with 35%-70% higher odds of having low aBMD Z-scores at total body, total hip, and femoral neck. CONCLUSION: Muscle strength deficits are prevalent in young pediatric cancer survivors, and such deficits are associated with lower aBMD Z-scores at all sites. These results suggest that interventions designed to improve muscle strength in this vulnerable population may have the added benefit of improving aBMD.


Assuntos
Densidade Óssea , Sobreviventes de Câncer , Força da Mão , Força Muscular , Humanos , Feminino , Masculino , Estudos Transversais , Densidade Óssea/fisiologia , Criança , Adolescente , Força Muscular/fisiologia , Força da Mão/fisiologia , Absorciometria de Fóton , Colo do Fêmur , Debilidade Muscular/fisiopatologia , Debilidade Muscular/etiologia
12.
Sci Rep ; 14(1): 12089, 2024 05 27.
Artigo em Inglês | MEDLINE | ID: mdl-38802388

RESUMO

Critical illness survivors commonly face impairments, such as intensive care unit-acquired weakness (ICUAW) which is characterized by muscle weakness and sensory deficits. Despite these symptoms indicating potential balance deficits, systematic investigations and validated assessments are lacking. Therefore, we aimed to assess balance function using the Mini-BESTest, evaluate its psychometric properties, and identify associated variables. Balance was assessed post-ICU discharge (V1) and at discharge from inpatient neurorehabilitation (V2) in patients with ≥ 5 days of invasive ventilation. Mini-BESTest measurement characteristics were evaluated in an ambulatory subgroup. A multiple linear regression was conducted. The prospective cohort study comprised 250 patients (34% female, 62 ± 14 years, median ICU stay 55 days). Median Mini-BESTest scores improved significantly from V1 (5 (IQR 0-15)) to V2 (18.5 (10-23)) with a large effect size. Excellent inter-rater and test-retest reliabilities of the Mini-BESTest were observed (ICC = 0.981/0.950). Validity was demonstrated by a very high correlation with the Berg Balance Scale (ρ = 0.90). No floor or ceiling effects were detected. Muscle strength, cognitive function, cerebral disease, critical illness polyneuropathy/myopathy, and depression were significantly associated with balance. Despite significant improvements during the rehabilitation period, balance disorders were prevalent in critical illness survivors. Ongoing therapy is recommended. Due to its excellent psychometric properties, the Mini-BESTest is suitable for use in critical illness survivors.Registration: The study was registered at the German Clinical Trials Register (DRKS00021753, date of registration: 2020-09-03).


Assuntos
Estado Terminal , Equilíbrio Postural , Psicometria , Sobreviventes , Humanos , Feminino , Pessoa de Meia-Idade , Psicometria/métodos , Estado Terminal/reabilitação , Masculino , Equilíbrio Postural/fisiologia , Idoso , Estudos Prospectivos , Unidades de Terapia Intensiva , Debilidade Muscular/fisiopatologia , Debilidade Muscular/diagnóstico , Força Muscular/fisiologia
13.
J Biomech ; 168: 112096, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38640828

RESUMO

Clinical management of whiplash-associated disorders is challenging and often unsuccessful, with over a third of whiplash injuries progressing to chronic neck pain. Previous imaging studies have identified muscle fat infiltration, indicative of muscle weakness, in the deep cervical extensor muscles (multifidus and semispinalis cervicis). Yet, kinematic and muscle redundancy prevent the direct assessment of individual neck muscle strength, making it difficult to determine the role of these muscles in motor dysfunction. The purpose of this study was to determine the effects of deep cervical extensor muscle weakness on multi-directional neck strength and muscle activation patterns. Maximum isometric forces and associated muscle activation patterns were computed in 25 test directions using a 3-joint, 24-muscle musculoskeletal model of the head and neck. The computational approach accounts for differential torques about the upper and lower cervical spine. To facilitate clinical translation, the test directions were selected based on locations where resistance could realistically be applied to the head during clinical strength assessments. Simulation results reveal that the deep cervical extensor muscles are active and contribute to neck strength in directions with an extension component. Weakness of this muscle group leads to complex compensatory muscle activation patterns characterized primarily by increased activation of the superficial extensors and deep upper cervical flexors, and decreased activation of the deep upper cervical extensors. These results provide a biomechanistic explanation for movement dysfunction that can be used to develop targeted diagnostics and treatments for chronic neck pain in whiplash-associated disorders.


Assuntos
Contração Isométrica , Força Muscular , Músculos do Pescoço , Humanos , Músculos do Pescoço/fisiologia , Músculos do Pescoço/fisiopatologia , Força Muscular/fisiologia , Contração Isométrica/fisiologia , Traumatismos em Chicotada/fisiopatologia , Modelos Biológicos , Fenômenos Biomecânicos , Cervicalgia/fisiopatologia , Pescoço/fisiopatologia , Pescoço/fisiologia , Vértebras Cervicais/fisiopatologia , Vértebras Cervicais/fisiologia , Feminino , Simulação por Computador , Debilidade Muscular/fisiopatologia
14.
Maturitas ; 187: 108057, 2024 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-38908060

RESUMO

OBJECTIVE: To describe the association of handgrip strength asymmetry and weakness with cognitive function among Chinese middle-aged and older adults. STUDY DESIGN: We used data from four waves (2011, 2013, 2015, and 2018) of the China Health and Retirement Longitudinal Study. Handgrip strength was measured at baseline. Handgrip strength asymmetry was defined on the basis of the ratio of handgrip strength of the non-dominant hand to that of the dominant hand (i.e. non-dominant/dominant): a ratio of <0.9 defined as dominant handgrip strength asymmetry and >1.1 as non-dominant handgrip strength asymmetry. Weakness was defined as a handgrip strength of <28 kg for males or <18 kg for females. MAIN OUTCOME MEASURES: Cognitive function with its two core dimensions (episodic memory and mental status) at each wave was assessed and standardized. RESULTS: 9333 participants (48.3 % female, age 58.2 ± 9.0 years) were included. Non-dominant but not dominant handgrip strength asymmetry was significantly associated with poorer cognitive function at baseline (ß = -0.121, -0.092, and -0.132 for mental status, episodic memory, and global cognition, respectively). In longitudinal analyses over 2 years, dominant handgrip strength asymmetry significantly slowed cognitive decline (ß = -0.078 and -0.069 for mental status and global cognition, respectively), and non-dominant handgrip strength asymmetry accelerated cognitive decline (ß = 0.053 and 0.043 for episodic memory and global cognition, respectively). Weakness was associated with poorer cognitive function at baseline and cognitive decline over 2, 4, and 7 years (all P < 0.05). CONCLUSIONS: In middle-aged and older adults, non-dominant handgrip strength asymmetry and weakness were associated with poorer cognitive function and predicted accelerated cognitive decline. Dominant handgrip strength asymmetry may be beneficial for maintaining cognitive function.


Assuntos
Cognição , Força da Mão , Debilidade Muscular , Humanos , Feminino , Masculino , Pessoa de Meia-Idade , Estudos Longitudinais , Debilidade Muscular/fisiopatologia , Idoso , China/epidemiologia , Estudos de Coortes , Disfunção Cognitiva/fisiopatologia , Memória Episódica
15.
Artigo em Inglês | MEDLINE | ID: mdl-38652620

RESUMO

Individuals with neurological disorders often exhibit altered manual dexterity and muscle weakness in their upper limbs. These motor impairments with tremor lead to severe difficulties in performing Activities of Daily Living (ADL). There is a critical need for ADL-focused robotic training that improves individual's strength when engaging with dexterous ADL tasks. This research introduces a new approach to training ADLs by employing a novel robotic rehabilitation system, Spherical Parallel INstrument for Daily Living Emulation (SPINDLE), which incorporates Virtual Reality (VR) to simulate ADL tasks. The study results present the feasibility of training individuals with movements similar to ADLs while interacting with the SPINDLE. A new game-based robotic training paradigm is suggested to perform ADL tasks at various intensity levels of resistance as needed. The proposed system can facilitate the training of various ADLs requiring 3-dimensional rotational movements by providing optimal resistance and visual feedback. We envision this system can be utilized as a table-top home device by restoring the impaired motor function of individuals with tremor and muscle weakness, guiding to improved ADL performance and quality of life.


Assuntos
Atividades Cotidianas , Robótica , Tremor , Realidade Virtual , Humanos , Tremor/reabilitação , Tremor/fisiopatologia , Masculino , Feminino , Pessoa de Meia-Idade , Treinamento Resistido/métodos , Retroalimentação Sensorial , Adulto , Jogos de Vídeo , Estudos de Viabilidade , Debilidade Muscular/reabilitação , Debilidade Muscular/fisiopatologia , Qualidade de Vida
16.
J Neurol Sci ; 462: 123098, 2024 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-38879961

RESUMO

BACKGROUND: Several studies have reported disproportionate wasting of the flexor muscles of the lower limbs (LL) compared to the extensors in patients with amyotrophic lateral sclerosis (ALS). However, these studies have involved small sample sizes (n ã€ˆ100), and their findings have been inconsistent. Thus, it remains uncertain whether a distinct pattern of LL muscle weakness is specific to ALS. AIMS: To investigate the muscle weakness pattern in the LL at the knee, ankle, and toes in a large cohort of ALS patients and evaluate the relationship between the pattern of muscle strength and the extent of upper (UMN) and lower (LMN) motoneuron impairment. MATERIAL AND METHODS: The strength of flexor and extensor muscle was evaluated in 1250 legs of newly diagnosed ALS patients at the knee, ankle, and foot toes. UMN and LMN burden were assessed using validated scores. Within-subjects ANOVA considering the type of muscle (flexor/extensor) and anatomical sites (knee/ankle/toes) and mixed-factorial ANOVA were conducted to explore the impact of UMN and LMN impairments on the muscle weakness pattern. RESULTS: Muscle strength showed a significant decline from proximal to distal regions. Indeed both flexor and extensor muscles at the knee outperformed those at the ankle and toes. Within each site, extensor muscles exhibited less strength than flexor, except at the knee. Patients with heightened UMN impairment showed a more marked difference between flexors and extensors within each site, with extensor muscles being more compromised at the ankle and toes. Higher LMN impairment corresponded to a more pronounced weakness in flexor muscles at the ankle and toes compared to those at the knee. CONCLUSIONS: The extensor muscle at the knee and the flexors at the foot and toes displayed relative resistance to ALS disease. UMN impairment amplified the differences between flexor and extensor muscles within each site, while LMN impairment demonstrated a clear distal-to-proximal vulnerability.


Assuntos
Esclerose Lateral Amiotrófica , Extremidade Inferior , Neurônios Motores , Força Muscular , Músculo Esquelético , Humanos , Esclerose Lateral Amiotrófica/fisiopatologia , Masculino , Feminino , Pessoa de Meia-Idade , Músculo Esquelético/fisiopatologia , Neurônios Motores/fisiologia , Idoso , Força Muscular/fisiologia , Extremidade Inferior/fisiopatologia , Debilidade Muscular/fisiopatologia , Debilidade Muscular/etiologia , Adulto , Estudos de Coortes
17.
Arch Gerontol Geriatr ; 122: 105385, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38417298

RESUMO

BACKGROUND: To evaluate the association between handgrip strength (HGS) weakness and asymmetry with incident hip fracture among older Chinese adults. METHODS: Data was obtained from the 2011 and 2015 waves of the China Health and Retirement Longitudinal Study (CHARLS). HGS weakness was defined as maximal HGS 〈 28 kg in men and < 18 kg in women. HGS asymmetry was defined as the HGS ratio < 0.9 or 〉 1.1. Participants were categorized into normal HGS, weakness only, asymmetry only, and both weakness and asymmetry. Given the sex differences in HGS, the association between HGS weakness and asymmetry was analyzed by sex using the multivariable logistic regression models. RESULTS: A total of 4789 participants aged ≥ 60 years old without hip fracture at baseline were included in the final analysis. Over the four-year follow-up, there were 152 (3.17 %) participants having incident hip fractures, of which 69 (2.90 %) were men and 83 (3.45 %) were women. Compared to the normal group, men with both weakness and asymmetry had a significantly higher risk of incident hip fracture in the fully adjusted model (adjusted odds ratio (OR): 2.31, 95 % confidence interval (CI):1.17-4.52). There was no significant association between HGS asymmetry and weakness with hip fracture in women. CONCLUSIONS: Our findings indicated that among the Chinese population, men with both HGS weakness and asymmetry were associated with increased odds of hip fracture, while no significant association was observed in women.


Assuntos
Força da Mão , Fraturas do Quadril , Debilidade Muscular , Humanos , Masculino , Feminino , Fraturas do Quadril/epidemiologia , Idoso , Força da Mão/fisiologia , Debilidade Muscular/epidemiologia , Debilidade Muscular/fisiopatologia , China/epidemiologia , Estudos Longitudinais , Pessoa de Meia-Idade , Incidência , Fatores de Risco , Fatores Sexuais , Idoso de 80 Anos ou mais , População do Leste Asiático
18.
J Alzheimers Dis ; 99(1): 393-402, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38669541

RESUMO

Background: The joint associations of handgrip strength (HGS) weakness and asymmetry with cognitive decline remain understudied in older adults. Objective: To investigate the associations between HGS weakness, asymmetry, and lower cognitive function in a nationally representative sample of older Americans. Methods: This cross-sectional study utilized data from the National Health and Nutrition Examination Survey 2011-2014. Weakness was defined as HGS <26 kg for men and <16 kg for women. Asymmetry was determined by calculating the ratio of dominant to non-dominant HGS. Participants with an HGS ratio <0.90 or >1.10 were classified as having any HGS asymmetry. Those with an HGS ratio >1.10 exhibited dominant HGS asymmetry, while those with an HGS ratio <0.90 displayed nondominant HGS asymmetry, respectively. Lower cognitive functioning was defined as global cognitive composite scores more than 1 standard deviation below the mean. Covariate-adjusted logistic regression models were used to analyze the associations between HGS asymmetry/weakness and lower cognitive functioning. Results: Compared to individuals with non-weak and symmetric HGS, those with any HGS asymmetry alone and weakness alone had 1.017 (95% confidence interval [CI]: 0.707-1.463) and 1.391 (95% CI: 0.542-3.571) greater odds for cognitive decline, while co-occurrence of both HGS asymmetry and weakness was associated with 3.724 (95% CI: 1.711-8.107) greater odds for lower cognitive function after controlling for confounders. Cnclusions: Individuals exhibiting both diminished and asymmetrical HGS demonstrated an elevated susceptibility to cognitive impairment, thereby implying that the inclusion of HGS asymmetry assessment in conjunction with weakness evaluation may enhance the accuracy of prognosticating cognitive decline.


Assuntos
Disfunção Cognitiva , Força da Mão , Debilidade Muscular , Inquéritos Nutricionais , Humanos , Masculino , Feminino , Força da Mão/fisiologia , Estudos Transversais , Idoso , Debilidade Muscular/fisiopatologia , Debilidade Muscular/epidemiologia , Disfunção Cognitiva/fisiopatologia , Disfunção Cognitiva/epidemiologia , Disfunção Cognitiva/diagnóstico , Idoso de 80 Anos ou mais , Estados Unidos/epidemiologia , Pessoa de Meia-Idade , Cognição/fisiologia
19.
Rev Assoc Med Bras (1992) ; 70(8): e20240061, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-39166672

RESUMO

AIM: The aim of the study was to determine the respiratory muscle strength of stroke patients and compare them with healthy individuals. METHOD: The study was conducted with 171 patients who had a stroke between 2017 and 2021 and 32 healthy controls. Respiratory muscle strength and inspiratory and expiratory mouth pressure (MIP and MEP) were measured using the portable MicroRPM device (Micro Medical, Basingstoke, UK). RESULTS: The stroke group exhibited significantly lower values in both MIP for men (p<0.001) and women (p=0.013) and maximal expiratory pressure for men (p<0.001) and women (p=0.042), compared with the healthy control group. Notably, there was a significant difference in the MIPmen (p=0.026) and MEPmen (p=0.026) values when comparing the reference values, which were calculated based on age and sex, with those of the healthy group. The baseline values calculated according to age for stroke patients were as follows: MIPmen 31.68%, MIPwomen 63.58%, MEPmen 22.54%, and MEPwomen 42.30%. CONCLUSION: This study highlights the significant respiratory muscle weakness experienced by stroke patients, with gender-specific differences. It highlights the importance of incorporating respiratory assessments and interventions into stroke rehabilitation protocols to improve the overall health and well-being of stroke patients.


Assuntos
Força Muscular , Músculos Respiratórios , Acidente Vascular Cerebral , Humanos , Masculino , Feminino , Músculos Respiratórios/fisiopatologia , Estudos de Casos e Controles , Acidente Vascular Cerebral/fisiopatologia , Acidente Vascular Cerebral/complicações , Pessoa de Meia-Idade , Força Muscular/fisiologia , Idoso , Adulto , Fatores Sexuais , Valores de Referência , Debilidade Muscular/fisiopatologia , Debilidade Muscular/etiologia , Reabilitação do Acidente Vascular Cerebral/métodos
20.
J Affect Disord ; 363: 401-408, 2024 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-39029688

RESUMO

BACKGROUND: Handgrip strength (HGS) weakness and asymmetry were recently reported to be associated with age-related health conditions. However, little is known about their combined effects on depression. We aimed to explore the joint association of HGS asymmetry and weakness with depressive symptoms in Chinese middle and older aged population. METHODS: 8700 participants aged ≥45 years were enrolled from China Health and Retirement Longitudinal Study (2015-2018). HGS weakness was determined as maximal HGS < 28 kg in males and <18 kg in females. HGS asymmetry was measured by HGS ratio and was defined using two different rules. Specifically, HGS ratio < 0.90 or >1.10 (10 % rule) and <0.80 or >1.20 (20 % rule) were considered as asymmetry. Participants were classified into four groups: normal and symmetric HGS, asymmetry only, weakness only, and both weakness and asymmetry. Depressive symptoms were assessed by the 10-item Center for Epidemiologic Studies Depression Scale, with scores ≥12 defined as depression. The logistic regression and multiple linear regression models were conducted to estimate the associations between HGS status and depressive symptoms. RESULTS: The three-year incidence of depression was 19.2 %. After adjusting for covariates, compared to normal and symmetric HGS, participants with both HGS asymmetry and weakness showed the greatest risk of incident depression (10 % rule: OR 1.55, 95 % CI 1.19-2.02; 20 % rule: OR 1.71, 95 % CI 1.16-2.50). The coexistence of asymmetry and weakness was related to a significant increase in depression score (10 % rule: ß 0.96, 95 % CI 0.38-1.54; 20 % rule: ß 0.94, 95 % CI 0.08-1.81). The complete case analysis supported the results, and the associations were not modified by age, sex, and hand dominance. LIMITATIONS: Depressive assessment was based on self-reported screening instrument. CONCLUSIONS: The presence of both HGS asymmetry and weakness was associated with a higher risk of depression. Examining HGS asymmetry along with weakness may aid in identifying individuals at risk of depression to enable early interventions.


Assuntos
Depressão , Força da Mão , Debilidade Muscular , Humanos , Masculino , Feminino , Pessoa de Meia-Idade , Força da Mão/fisiologia , Idoso , China/epidemiologia , Depressão/epidemiologia , Depressão/fisiopatologia , Debilidade Muscular/fisiopatologia , Debilidade Muscular/epidemiologia , Estudos Longitudinais , Estudos de Coortes , Incidência
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