Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 29.583
Filtrar
1.
Zhonghua Yi Xue Za Zhi ; 100(41): 3246-3249, 2020 Nov 10.
Artigo em Chinês | MEDLINE | ID: mdl-33167112

RESUMO

Objective: To analyze the mechanism of invasive blood pressure change in radial artery caused by arm elevation by observing pressure, velocity and diameter of radial artery. Methods: Twenty-six hemodynamically stable hepatobiliary surgery patients admitted to the intensive care unit from June to December 2018 after general anesthesia in Tsinghua Changgung Hospital were selected. When the arm was raised, the invasive blood pressure was recorded, and the inner diameter and blood flow velocity of the radial artery were measured by Doppler ultrasound. The data following a normal distribution were compared with paired t test. Results: After arm elevation for 30 s, systolic blood pressure of radial artery decreased and diastolic blood pressure increased significantly((107±16) mmHg vs (120±17) mmHg, (75±6) mmHg vs (71±9) mmHg, t=25.0, -12.6, both P<0.05), but there was no significant difference in mean arterial pressure ((87±10) mmHg vs (87±11) mmHg, t=1.1, P>0.05). The peak velocity, end-diastolic velocity and resistance index of the radial artery increased significantly, and the transverse and longitudinal inner diameters of the radial artery decreased significantly after the arm was elevated for 30 s (t=-63.4, -14.6, -22.5, 31.4, 25.3, all P<0.01). Conclusions: Kinetic pressure compensation and vascular resistance compensation may be the main mechanism of radial artery pressure change when the arm is elevated. Arm elevation can be used as a vascular resistance response test clinically.


Assuntos
Pressão Arterial , Hidrodinâmica , Braço , Velocidade do Fluxo Sanguíneo , Pressão Sanguínea , Determinação da Pressão Arterial , Humanos , Artéria Radial
2.
Artigo em Chinês | MEDLINE | ID: mdl-33036526

RESUMO

Objective: To study the differences of different signal processing method of surface electromyography (sEMG) in judging muscle fatigue. Methods: From July to October 2019, based on the model of simulated manual lifting operation, the original sEMG signals from 13 volunteers of brachial radial muscle, brachial two-headed muscle, triangle muscle, left vertical spine muscle, right vertical spine muscle and lateral femoral muscle were collected in the operation activities. Three different electromyography signal processing methods (all signal from motion beginning to the end, peak signal and ehe specified motion signal) were used to analyze the original data in time domain (RMS) and frequency domain (MDF) , the data difference between different electromyography signal processing methods was analyzed by using Wilcoxon rank and sum test and nonlinear curve fitting method. Results: The age of the subjects of the simulated lifting operation was (24.31±2.02) years old, height (173.78±4.84) cm, weight (66.28±5.58) kg, body mass index (BMI) 21.94±1.58. The thickness of triceps skinfold was (14.08±4.86) mm, and the thickness of the skin fold under the scapula was (15.54±3.59) mm. After processing the original signal data by using different sEMG signal interception methods, the normality test, Levene's test, and the Wilcoxon test showed that, except for the MDF index of the brachial two-headed muscle, the differences in the RMS and MDF signals of the other muscles were statistically significant (P<0.016) . The all signal processing method dealed with data distribution dispersion better than other methods, and the rate of change of RMS signal slope was higher than other methods. Non-linear regression results showed that all signal processing method had low volatility in processing data, and the regression equation had a high degree of fit. Conclusion: Different electromyography signal processing methods have differences. The all signal processing method which intercepts from starting point to the end point of action cycle has the least data volatility, and electromyography time domain and frequency domain index with the highest sensitivity of time, which is suitable for the application of surface electromyography to judge muscle fatigue in dynamic and complex operations.


Assuntos
Remoção , Fadiga Muscular , Adulto , Braço , Eletromiografia , Humanos , Músculo Esquelético , Adulto Jovem
3.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 4758-4761, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33019054

RESUMO

Human-robot interactions help in various industries and enhance the user experience in different ways. However, constant safety monitoring is needed in environments where human users are at risk, such as rehabilitation therapy, space exploration, or mining. One way to improve safety and performance in robotic tasks is to include biological information of the user in the control system. This can help regulate the energy that is delivered to the user. In this work, we estimate the energy absorbing capabilities of the human arm, using the metric Excess of Passivity (EOP). EOP data from healthy subjects were obtained based on Forcemyography of the subjects' arm, to expand the sources of biological information and improve estimations.Clinical relevance- This protocol can help determine the ability of rehabilitation patients to withstand robotic stimulation with high amplitudes of therapeutic forces, as needed in assistive therapy.


Assuntos
Braço , Robótica , Humanos , Miografia , Fenômenos Físicos
4.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 4909-4912, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33019089

RESUMO

Vibro-tactile feedback offers a complementary augmentation cue for motor guidance and training. Motivated by the needs of prosthetic vision rehabilitation, we explore the use of the cylindrical forearm surface to deliver arm guidance cues via vibro-tactile stimulation. We present 'VibroSleeve', a novel wearable arm motion guidance aid made up of 4x4 arrangement of vibration coin motors embedded within an elastic sleeve for delivering vibro-tactile patterns to the forearm. In this paper, we present the concept and design of VibroSleeve, along with results of preliminary evaluation. We outline key insights gained into the perceptual aspects of calibration and usable intensity bandwidth critical for reliable interpretation of encoded information. Our results demonstrate feasibility of the approach, and provide foundations for future work on developing the sleeve as a rehabilitation aid for guiding the arm towards visually perceived targets.


Assuntos
Braço , Dispositivos Eletrônicos Vestíveis , Retroalimentação , Tato , Vibração
5.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 4921-4925, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33019092

RESUMO

Individuals with neurological impairment, particularly those with cervical level spinal cord injuries (SCI), often have difficulty with daily tasks due to triceps weakness or total loss of function. More demanding tasks, such as sit-skiing, may be rendered impossible due to their extreme strength demands. Design of exoskeletons that address this issue by providing supplemental strength in arm extension is an active field of research but commercial devices are not yet available for use. Most current designs employ electric motors that necessitate the addition of bulky power sources and extraneous wiring, rendering the devices impractical in daily life. The possibility of powering an upper extremity exoskeleton passively has been explored, but to date, none have delivered sufficient function or strength to provide useful assistance for sit-skiing. We seek to rectify this with the design of a passively actuated exoskeletal arm brace capable of operating in two, adjustable-strength modes: one for low level gravity compensation to aid in active range of motion, and the other for more stringent weight bearing activities. The mechanism developed through this paper allows for an affordable, lightweight, modular device that can be adjusted and customized for the needs of each individual patient.


Assuntos
Exoesqueleto Energizado , Braço , Fenômenos Biomecânicos , Humanos , Músculo Esquelético , Amplitude de Movimento Articular
6.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 3909-3912, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33018855

RESUMO

Haptic feedback allows an individual to identify various object properties. In this preliminary study, we determined the performance of stiffness recognition using transcutaneous nerve stimulation when a prosthetic hand was moved passively or was controlled actively by the subjects. Using a 2x8 electrode grid placed along the subject's upper arm, electrical stimulation was delivered to evoke somatotopic sensation along their index finger. Stimulation intensity, i.e. sensation strength, was modulated using the fingertip forces from a sensorized prosthetic hand. Object stiffness was encoded based on the rate of change of the evoked sensation as the prosthesis grasped one of three objects of different stiffness levels. During active control, sensation was modulated in real time as recorded forces were converted to stimulation amplitudes. During passive control, prerecorded force traces were randomly selected from a pool. Our results showed that the accuracy of object stiffness recognition was similar in both active and passive conditions. A slightly lower accuracy was observed during active control in one subject, which indicated that the sensorimotor integration processes could affect haptic perception for some users.


Assuntos
Membros Artificiais , Estimulação Elétrica Nervosa Transcutânea , Braço , Estimulação Elétrica , Mãos
7.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 4882-4885, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33019083

RESUMO

Many researchers have developed assist-suits to support repetitive and strenuous physical labor, but existing suits show unsatisfactory responsiveness and restrict arm motions. Therefore, we propose a method for an arm-assist-suit that synchronizes arm motions by using electromyography (EMG) to predict arm trajectory. EMG is used to measure and record electrical signals while muscles are active. Further, predicted arm-joint motions and estimated arm-joint angles are used for arm trajectory predictions. In this study, we attempted the prediction of elbow-joint motions and the timing of motion changes. Two subjects executed twelve types of elbow-joint movements that had four start and endpoints. We measured seven muscle types with EMG points on the right arm(hand, elbow, and shoulder) a motion capture system, respectively. After processing these data, we applied a multiclass logistic regression, which is a machine-learning technique, to predict elbow-joint motions, namely, rest, flexion, and extension. The precision in elbow joint motion prediction shows a difference between the two subjects for the three motions analyzed. Additionally, the rest prediction accuracy is lower than both flexion and extension for each subject. The prediction of elbow-joint motion change timing does not correlate with the elbow-joint motion predictions, with the timing prediction precision being very low and thus, causing some difficulties. To overcome these difficulties, and improve precision in future work, we plan to apply an independent component analysis to eliminate noise and add or change features.Clinical Relevance- This study aims to establish a benchmark for future research on the improvement of responsiveness and range-of-motion of arm-assist-suits.


Assuntos
Braço , Articulação do Cotovelo , Eletromiografia , Cotovelo , Humanos , Movimento
8.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 690-693, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33018081

RESUMO

The nonstationarity measure of surface Electromyography (sEMG) signals provide an index for muscle fatigue conditions. In this paper, a new framework has been proposed for the analysis of sEMG signal using Instantaneous Spectral Centroid (ISC). The novelty of the proposed work is use of topological signal processing method to quantify the nonstationarity of sEMG signal. For this, the signals are recorded from the biceps brachii muscles of 25 healthy subjects in isometric contraction. The analytical signals corresponding to nonfatigue and fatigue segments are computed using Hilbert Transform. Further, topological features such as center of gravity (CoG), triangular area function (TAF) and ISC are calculated from the geometrical representation of a transformed signal. The result indicates the increase of TAF in fatigue condition and the significant right shift of CoG in x-axis for 80% of subjects. Importantly, the ISC estimate is decreased by 17% upon fatiguing for 84% of subjects. The obtained results show statistical significance with p < 0.05. It is observed that the shape parameters are varied in accordance with the changes observed in global characteristics of sEMG signals during muscle fatigue. The preliminary results show that the topological features are able to quantify the nonstationarity in sEMG signal. Therefore, the proposed method can be used as a fatigue index for diagnosing various neuromuscular disorders.Clinical Relevance-This method can be used to establish metrics of muscle fatigue for the benefit of physicians especially in the field of fitness, sports, pre and post-surgery surveillance and rehabilitation.


Assuntos
Contração Isométrica , Fadiga Muscular , Animais , Braço , Eletromiografia , Músculo Esquelético
9.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 3577-3580, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33018776

RESUMO

Electrical stimulation of the vagus nerve has been shown to enhance cortical plasticity and may benefit upper extremity rehabilitation following stroke. As an initial step towards assessing the potential of other craniocervical nerves as neuromodulation targets during rehabilitation, we explored the ability of non-invasive stimulation of cervical spine afferents, paired with a proprioceptive discrimination task, to improve sensory function in neurologically intact human subjects. On each trial, subjects' arms were moved by a robot from a test position, along a random path, to a judgment position located 1-4 cm away. Subjects responded 'same' if the judgment position was the same as the test or 'different' if it was not. These responses were used to compute proprioceptive sensitivity and bias. Three groups of 20 subjects received transcutaneous electric nerve stimulation to the C3/C4 cervical spine at one of three frequencies (30 Hz, 300 Hz, 3 kHz) for 10 minutes prior to task performance. A fourth group served as a sham. We found a statistically significant interaction between stimulation frequency and displacement distance on proprioceptive sensitivity. In summary, stimulation of cervical spine afferents may enhance arm proprioceptive function, though in unimpaired subjects these gains depend on both stimulation frequency and discrimination distance.Clinical Relevance- This study provides preliminary data on the potential for non-invasive stimulation of cervical spine afferents to enhance recovery of function following stroke and other neurological disorders.


Assuntos
Reabilitação do Acidente Vascular Cerebral , Acidente Vascular Cerebral , Estimulação Elétrica Nervosa Transcutânea , Braço , Humanos , Extremidade Superior
10.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 3739-3742, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-33018814

RESUMO

The objective of this study was to quantify the differences in surface electromyogram (EMG) signal characteristics between affected and contralateral arm muscles of hemispheric stroke survivors. EMG signals were recorded from the biceps brachii muscles using single differential electrodes. Four chronic stroke subjects performed isometric elbow flexions at sub-maximal voluntary contraction levels on both the affected and contralateral limbs. The force generated on the contralateral side was matched to the force generated on the affected side. We observed different types of EMG activation on the affected side compared to the contralateral side.Specifically, two subjects showed lower RMS EMG activity on the affected side whereas two subjects showed greater EMG activity on the affected side compared to the contralateral side. Analysis of the peak amplitudes of the EMG activity showed greater number of peaks in the EMG on affected side compared to the contralateral side in all subjects. The histogram of the peak amplitudes showed greater number of smaller peak amplitudes in subjects with lower EMG activity on the affected side suggesting a reliance on smaller motor units. Our combined EMG signal analysis techniques on one set of recorded signals provides insight regarding potential mechanisms of weakness.Clinical Relevance- Decoding neural information from surface EMG signals without decomposition into individual motor units could provide clinicians with quick insight about disease progress and potential treatment.


Assuntos
Articulação do Cotovelo , Acidente Vascular Cerebral , Braço , Eletromiografia , Humanos , Músculo Esquelético
11.
Med Probl Perform Art ; 35(3): 162-166, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32870968

RESUMO

AIMS: Among musicians, string players have the highest prevalence for musculoskeletal overuse. Playing a violin or viola requires rapid, repetitive, and complicated movements of the hands and fingers. This cross-sectional study aimed to examine whether violin/viola, violin/cello, and violin/French horn players experience more intense musculoskeletal pain than other instrumentalists. METHODS: The study sample consisted of 590 orchestra musicians (354 male, 236 female, mean age 36 yrs). Self-administered questionnaires were used to assess pain of the back, neck, shoulder, face, jaw, and upper extremity. Pain intensity during the last 7 days was measured by an 11-point numeric rating scale (NRS) with a score from 0 to 10, as well as was disadvantage at work and leisure. RESULTS: Of the interviewed musicians, 20% presented playing-related musculoskeletal disorders at the time of the interview. Compared to other professional orchestra musicians, violin and viola players reported significantly more intense pain in the hand during the last week. Also, they had experienced more frequent neck pain ever and in 5 years than the others. During the past 30 days, violin and viola players had also perceived more harm in their upper limb joints. Violin/cello and violin/French horn players did not differ from the others. CONCLUSIONS: Our study showed that musicians playing the violin or viola have more intense hand pain and more frequent neck pain than other musicians, but these seem to disturb their daily tasks only a little.


Assuntos
Dor Musculoesquelética , Música , Cervicalgia , Doenças Profissionais , Adulto , Braço , Estudos Transversais , Feminino , Humanos , Masculino
12.
J Sports Sci ; 38(20): 2314-2320, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32965184

RESUMO

This study was designated to investigate the kinematical differences between successful and faulty spikes, in order to identify the best strategies leading to better spike performance. Simulating a real-game condition, 13 elite youth attackers performed 6 spikes in the presence of 2 blocks. The kinematic variables of the spike performances were recorded using 6 optoelectronic cameras (Vicon Motion systems, Oxford, UK). The paired sample t-test was used to compare the kinematic variables recorded during the delivery of successful and faulty spikes. Among the successful trials, both the angular velocities of the knees (≈12.4%) and hips (≈13.3%), and the vertical velocity of the centre of mass at take-off (≈6.5%) and arm swing (≈8.2%) were considerably higher during the plant phase. Consequently, the jump (≈4.3%) and spike (≈1.5%) heights, as well as the wrist velocity (≈5.5%), were significantly higher during the jump phase of successful spikes. In successful spike performances, the attackers adopted higher hip and knee angular velocities, combined with efficient arm swings, to produce higher take-off velocities and reach higher jump heights. This approach provides them with the better position regarding the ball and the blockers to find the best path and hit the ball with higher arm velocities.


Assuntos
Destreza Motora/fisiologia , Voleibol/fisiologia , Adolescente , Braço/fisiologia , Desempenho Atlético/fisiologia , Fenômenos Biomecânicos , Cotovelo/fisiologia , Quadril/fisiologia , Humanos , Joelho/fisiologia , Ombro/fisiologia , Estudos de Tempo e Movimento , Punho/fisiologia
13.
J Spec Oper Med ; 20(3): 52-61, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32969004

RESUMO

BACKGROUND: The OMNA Marine Tourniquet is a 5.1cm-wide, simple redirect buckle, hoop-and-loop secured, ratcheting tourniquet designed for storage and use in marine environments. This study evaluated self-application effectiveness and pressures. METHODS: Triplicate secured, occlusion, and completion pressures were measured during 60 subjects pulling down or up thigh applications and nondominant, single-handed arm applications. Arm pressure measurements required circumferences =30cm. RESULTS: Thirty-one subjects had arm circumferences ≥30cm. All 540 applications were effective; 376 of 453 applications had known secured pressures >150mmHg (89 of 93 arm). Thigh down versus up pulling directions were not different (secured, occlusion, and completion pressures and ladder tooth advances). Occlusion pressures were 348mmHg (275-521mmHg) for combined thighs and 285mmHg (211-372mmHg) for arms. Completion pressures were 414mmHg (320-588mmHg) for combined thighs and 344mmHg (261-404mmHg) for arms. Correlations between secured pressures and occlusion ladder tooth advances (clicks) were r2 = 0.44 for combined thighs and 0.68 for arms. Correlations between occlusion pressures and occlusion clicks were poor (r2 = 0.24, P < .0001 for combined thighs and r2 = 0.027, P = .38 for arms). CONCLUSIONS: The OMNA Marine Tourniquet can be self-applied effectively, including one-handed applications. Occlusion and completion pressures are similar to reported 3.8cm-wide Ratcheting Medical Tourniquet pressures.


Assuntos
Torniquetes , Braço , Mãos , Humanos , Pressão , Coxa da Perna
14.
PLoS One ; 15(8): e0236504, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32745109

RESUMO

The aim of this study was to compare underwater fin swimming performance using dolphin, flutter and breaststroke kicks with and without diving gear. Performance was evaluated in terms of average swimming velocity. The parameters of spatiotemporal structure of the stroke reflecting to the swimming economy were employed. Conscious modifications in propulsion technique were considered here with the aim of controlling swimming performance. A total of ten professional scuba divers swam at maximal speed underwater for 50m using each of three techniques: dolphin, flutter, or breaststroke kicks. Swimmers' performance was compared between holding their breath and using breathing apparatus. Two cameras recorded their movements in sagittal and transverse planes. The average swimming velocity (vav), stroke length (SL), stroke rate (SR), index of variation of intracycle velocity (VIVIndex) and stroke index (SI) were estimated. Relative to the other techniques, the dolphin kick without a diving gear demonstrated the highest vav and low SI and VIVIndex values, which reflects the most advantageous economy of propulsion at given velocity. Given the lack of statistical differences, using the breaststroke kick and flutter kick when swimming with a diving gear seems to be comparable to dolphin-kick in terms of average velocity and parameters reflecting the economy of propulsion. Thus, a search for fin swimming techniques with the aim of achieving specific goals seemed reasonable. The results suggest, that performance achieved while using various fin swimming techniques was probably controlled by different strategies of leg movements. These strategies revealed differences in a spatiotemporal (SR-SL) structure of the stroke and they were closely associated in terms of the velocity variation decrease.


Assuntos
Fenômenos Biomecânicos/fisiologia , Mergulho/fisiologia , Golfinhos/fisiologia , Natação/fisiologia , Animais , Braço/fisiologia , Humanos , Masculino , Movimento/fisiologia
15.
Am J Occup Ther ; 74(5): 7405205100p1-7405205100p9, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32804628

RESUMO

IMPORTANCE: Constraint-induced movement therapy (CIMT) is a common treatment for children with unilateral cerebral palsy (CP). Although clinic-based assessments have demonstrated improvements in arm function after CIMT, whether these changes are translated and sustained outside of a clinic setting remains unclear. OBJECTIVE: Accelerometers were used to quantify arm movement for children with CP 1 wk before, during, and 4 wk or more after CIMT; measurements were compared with those from typically developing (TD) peers. DESIGN: Observational. SETTING: Tertiary hospital and community. PARTICIPANTS: Seven children with CP (5 boys, 2 girls; average [AVE] age ± standard deviation [SD] = 7.4 ± 1.2 yr) and 7 TD peers (2 boys, 5 girls; AVE age ± SD = 7.0 ± 2.3 yr). INTERVENTION: 30-hr CIMT protocol. OUTCOMES AND MEASURES: Use ratio, magnitude ratio, and bilateral magnitude were calculated from the accelerometer data. Clinical measures were administered before and after CIMT, and parent surveys assessed parent and child perceptions of wearing accelerometers. RESULTS: During CIMT, the frequency and magnitude of paretic arm use among children with CP increased in the clinic and in daily life. After CIMT, although clinical scores showed sustained improvement, the children's accelerometry data reverted to baseline values. Children and parents in both cohorts had positive perceptions of accelerometer use. CONCLUSIONS AND RELEVANCE: The lack of sustained improvement in accelerometry metrics after CIMT suggests that therapy gains did not translate to increased movement outside the clinic. Additional therapy may be needed to help transfer gains outside the clinic. WHAT THIS ARTICLE ADDS: Accelerometer measurements were effective at monitoring arm movement outside of the clinic during CIMT and suggested that additional interventions may be needed after CIMT to sustain benefits.


Assuntos
Paralisia Cerebral , Acelerometria , Braço , Criança , Feminino , Humanos , Masculino , Movimento , Modalidades de Fisioterapia , Resultado do Tratamento
16.
Int. j. morphol ; 38(4): 1148-1154, Aug. 2020. tab
Artigo em Inglês | LILACS | ID: biblio-1124908

RESUMO

The aim of this study is to investigate rs1805086 and rs1805065 polymorphisms of MSTN gene of national and amateur Turkish arm wrestlers and people leading a sedentary lifestyle, and the anthropometric properties such as hand, wrist, and forearm circumferences of national and amateur Turkish arm wrestlers are aimed to be explored. In this study, a total of 79 volunteers who were 24 national (7 females, 17 males) Turkish arm wrestlers, 21 amateur (7 females, 14 males) Turkish arm wrestlers and 34 sedentary people (12 females, 22 males) participated. To analyse the data, Statistical Package for the Social Sciences, SPSS 22 (SPSS Inc., Chicago, IL, USA) was used. As a result of the study, when data on rs1805086 and rs1805065 polymorphisms of MSTN gene were examined respectively, it was found out that MSTN 153KK genotype was 100.0% dominant in both national (n=24) and amateur (n=21) arm wrestlers, and it was 94.12 % dominant in sedentary people. KR genotype was observed in 5.88 % of the sedentary people. The data from the other rs1805065 polymorphism of MSTN gene showed that all participants (n = 45, 100.0 %) were carriers of normal homozygous genotype. Furthermore, for both female group and male group, there found to be statistically significant difference in terms of anthropometric properties. It can be concluded that though there was no significant difference between national and amateur Turkish arm wrestlers in terms of their MSTN gene characteristics; in terms of anthropometric properties, significant differences were discovered. It was found out that on these athletes, not MSTN gene polymorphisms but anthropometric properties were effective.


El objetivo de este estudio fue investigar los polimorfismos rs1805086 y rs1805065 del gen MSTN de luchadores de brazos turcos, nacionales y aficionados, y personas que llevan un estilo de vida sedentario, y las propiedades antropométricas además de las circunferencias de manos, muñecas y antebrazos de los luchadores de brazos turcos nacionales y aficionados. En este estudio, participaron un total de 79 voluntarios: 24 luchadores de brazos turcos nacionales (7 mujeres, 17 hombres), 21 luchadores de brazos turcos aficionados (7 mujeres, 14 hombres) y 34 personas sedentarias (12 mujeres, 22 hombres). Para analizar los datos, se utilizó el Paquete Estadístico para las Ciencias Sociales, SPSS 22 (SPSS Inc., Chicago, IL, EE. UU.). Como resultado del estudio, cuando se examinaron los datos sobre los polimorfismos rs1805086 y rs1805065 del gen MSTN respectivamente, se descubrió que el genotipo MSTN 153KK era 100,0 % dominante en luchadores de brazos nacionales (n = 24) y aficionados (n = 21) , y era 94,12 % dominante en personas sedentarias. El genotipo KR se observó en el 5,88 % de las personas sedentarias. Los datos del otro polimorfismo rs1805065 del gen MSTN mostraron que todos los participantes (n = 45; 100,0 %) eran portadores del genotipo homocigoto normal. Además, tanto para el grupo femenino como para el masculino, se encontró una diferencia estadísticamente significativa en términos de propiedades antropométricas. Se puede concluir que, aunque no hubo una diferencia significativa entre los luchadores de brazos turcos nacionales y aficionados en términos de sus características genéticas MSTN; en términos de propiedades antropométricas, se descubrieron diferencias significativas. Se descubrió que, en estos atletas, no fueron los polimorfismos del gen MSTN sino las propiedades antropométricas las efectivas.


Assuntos
Humanos , Masculino , Feminino , Braço/anatomia & histologia , Polimorfismo Genético , Luta Romana , Miostatina/genética , Atletas , Turquia , Punho/anatomia & histologia , Antropometria , Desempenho Atlético/fisiologia , Antebraço/anatomia & histologia , Genótipo , Mãos/anatomia & histologia
17.
Medicine (Baltimore) ; 99(34): e21830, 2020 Aug 21.
Artigo em Inglês | MEDLINE | ID: mdl-32846828

RESUMO

Brachial plexus birth palsy (BPBP) is a neurologic injury that can result in mild to full paralysis of the affected upper extremity. In severe cases, nerve surgery is often performed before age 1 year. Several studies report gains in elbow flexion with onabotulinum toxin type A (OBTT-A) injections to the triceps; however, its use in infants is not widely reported. The purpose of this study is to present our experience using these injections before 6 months of age to therapeutically unmask elbow flexion and diagnostically guide surgical decision making.This is a retrospective observational cohort study. The cohort included infants with BPBP who received OBTT-A injection to the triceps before age 6 months. Indications for the injections include trace elbow flexion and palpable co-contraction of the biceps and triceps. Elbow flexion was evaluated using the Toronto Test score. Therapeutic success was defined as an increase in post-injection scores. These scores were then used diagnostically as an indication for surgery if the infant did not achieve full elbow flexion by 8 months. A treatment algorithm for OBTT-A triceps injection was developed based on all treatment options offered to infants with elbow flexion deficits seen in the clinic.Of the 12 infants that received OBTT-A triceps injections, 10 (83%) had improved Toronto test elbow flexion scores post-injection. Gains in elbow flexion once attained were maintained. Of the 9 OBTT-A infants with at least 2 years follow-up, 4 achieved full elbow flexion without surgery; the remainder after surgery. No complications with OBTT-A injections were noted and patients were followed on average 6 years. The average age at time of injection was 4 months (range: 2-5 months). Compared to other treatments given, OBTT-A infants tended to present with more elbow flexion than the 4 infants requiring immediate surgical intervention and less elbow flexion than the 16 infants treated conservatively.OBTT-A injection to the triceps in infants with BPBP before 6 months of age therapeutically improved elbow flexion and diagnostically guided surgical decisions when full elbow flexion was not achieved by 8 months of age with no known complications.


Assuntos
Toxinas Botulínicas Tipo A/uso terapêutico , Articulação do Cotovelo/fisiopatologia , Músculo Esquelético/fisiopatologia , Paralisia do Plexo Braquial Neonatal/tratamento farmacológico , Fármacos Neuromusculares/uso terapêutico , Amplitude de Movimento Articular/efeitos dos fármacos , Braço , Toxinas Botulínicas Tipo A/administração & dosagem , Criança , Pré-Escolar , Tomada de Decisão Clínica , Seguimentos , Humanos , Lactente , Injeções Intramusculares , Paralisia do Plexo Braquial Neonatal/fisiopatologia , Paralisia do Plexo Braquial Neonatal/cirurgia , Fármacos Neuromusculares/administração & dosagem , Estudos Retrospectivos
18.
PLoS One ; 15(8): e0237887, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32817652

RESUMO

The effects of High-Intensity Functional Training (HIFT) on body composition and the relationship of the latter with performance are not well defined. In this work we investigated, by means of Dual-energy X-ray Absorptiometry, the relative proportions of fat-, lean soft tissue-, and mineral mass in CrossFit® (CF, a popular mode of HIFT) participants (n = 24; age, 28.2 ± 3.39 y; BMI, 25.3 ± 2.04 kg/m2) with at least 1 year of CF training experience and weekly amount of training > 10 h/w (n = 13; Higher Training, HT) or < 10 h/w (n = 11; Lower Training, LT) as well as age- matched and BMI-matched physically active controls (CHT, CLT). Performance was assessed in the "Fran" workout. Data were analyzed by one-way or repeated measures ANOVA where needed. Association between variables was assessed with the Pearson's correlation coefficient r. Partial correlation was used where needed. Results showed that HT performed better than LT in the "Fran" (P < 0.001) and they had higher whole-body bone mineral density (P = 0.026) and higher lean soft mass (P = 0.002), and borderline lower percent fat mass (P = 0.050). The main difference between CF participants (HT, LT) and their respective controls (CHT, CLT) was a lower adiposity in the former. In CF participants, performance positively correlated with appendicular lean soft tissue mass (P = 0.030). It can be concluded that, in CF participants, a higher amount of weekly training improves most notably lean body mass and increases performance in association with increased skeletal muscle mass. CF participation is especially effective in reducing fat mass vs. age- and BMI-matched physically active controls.


Assuntos
Composição Corporal/fisiologia , Exercício Físico/fisiologia , Treinamento Intervalado de Alta Intensidade/métodos , Músculo Esquelético/fisiologia , Absorciometria de Fóton , Tecido Adiposo , Adiposidade/fisiologia , Adulto , Braço/fisiologia , Glicemia , Índice de Massa Corporal , Peso Corporal , Densidade Óssea , Capilares/fisiologia , Humanos , Masculino , Músculo Esquelético/anatomia & histologia , Adulto Jovem
19.
PLoS One ; 15(8): e0238197, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32841286

RESUMO

The aim of this study was to compare artistic swimmers (ASs) and water polo players (WPs) in their polyrhythmic production ability and entrainment between arm and leg motion frequency. Nine ASs and nine WPs participated in the study. First, we assessed the natural eggbeater kick frequency of each participant without any additional motion for 20 s. We then required the participants to perform a circular arm movement in synchronization with two sequences of metronome rhythms (either 100%, 80% and 120% or100%, 120% and 80% of their natural eggbeater kick frequency) while maintaining their natural eggbeater kick frequency. All tasks were repeated three times. The participants' performances were recorded by a motion capture system synchronized with the metronome. A two-way mixed-design ANOVA was performed on the coefficient of variation of natural eggbeater kick frequency obtained from the first task to confirm the consistency of participants' kicking motion. In the second task, a three-way mixed-design ANOVA was performed on the average frequency of the arm and leg motions to assess the entrainment between the two. In the first task, there were no significant main effects and interaction between group and trial in the coefficient of variation of eggbeater kick frequency, suggesting that both WPs and ASs maintained their natural eggbeater kick frequency equally consistently. In the second task, however, WPs were not able to maintain their natural eggbeater kick frequency when they were required to do circular arm movements at 120% tempo (p < .01). On the other hand, ASs successfully maintained their natural eggbeater kick frequency with all metronome rhythms, suggesting that they have a better polyrhythmic production ability than WPs.


Assuntos
Música , Natação/fisiologia , Esportes Aquáticos/fisiologia , Adolescente , Adulto , Braço/fisiologia , Desempenho Atlético/fisiologia , Fenômenos Biomecânicos , Feminino , Humanos , Perna (Membro)/fisiologia , Masculino , Destreza Motora/fisiologia , Movimento/fisiologia , Amplitude de Movimento Articular/fisiologia , Adulto Jovem
20.
Eur J Vasc Endovasc Surg ; 60(3): 403-409, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32768278

RESUMO

OBJECTIVE: Vein is regarded superior to artificial graft in peripheral arterial bypass surgery. However, this option is often limited owing to previous use or removal of the ipsilateral greater saphenous vein (iGSV). In this case, the contralateral great saphenous vein (cGSV), the small saphenous vein (SSV), or arm veins (AV) are possible alternatives. Experience with all three grafts for below knee vein bypass is reported. METHODS: Consecutive patients treated at an academic tertiary referral centre between January 1998 and July 2018 using the cGSV, SSV, or AV as the main peripheral bypass graft were analysed. Study end points were primary patency, secondary patency, limb salvage, and survival. RESULTS: Over the observed time period, 2642 bypass operations for treatment of peripheral artery disease with below knee target arteries were performed at the authors' institution: 1937 procedures using the iGSV; 644 bypass procedures using the cGSV (n = 186; 28.9%), SSV (n = 101; 15.7%), or AV (n = 357; 55.4%); and 61 procedures using a prosthetic graft. The median follow up period was 2.3 years (range 9 days-18.5 years). Thirty day mortality was 1.9% for the whole group and similar between the three groups. After five years, primary and secondary patency rates were comparable between the three groups. Secondary patency was 75% (95% confidence interval [CI] 66-83) in the cGSV and SSV groups, and 65% (95% CI 57-73) in the AV group (p = .47). Limb salvage and survival after five years were, respectively, 73% (95% CI 65-81) and 89% (95% CI 82-95) in the cGSV group, 79% (95% CI 69-89) and 87% (95% CI 79-95) in the SSV group, and 74% (95% CI 68-80) and 83% (77-89) in the AV group (p = .46). CONCLUSION: All three types of alternative autologous vein graft are equal regarding outcome parameters. Vascular surgeons should consider all autologous options if their preferred choice is not available.


Assuntos
Braço/irrigação sanguínea , Implante de Prótese Vascular , Extremidade Inferior/irrigação sanguínea , Doença Arterial Periférica/cirurgia , Veia Safena/transplante , Adulto , Idoso , Idoso de 80 Anos ou mais , Amputação , Implante de Prótese Vascular/efeitos adversos , Bases de Dados Factuais , Feminino , Oclusão de Enxerto Vascular/etiologia , Oclusão de Enxerto Vascular/fisiopatologia , Oclusão de Enxerto Vascular/cirurgia , Humanos , Salvamento de Membro , Masculino , Pessoa de Meia-Idade , Doença Arterial Periférica/diagnóstico por imagem , Doença Arterial Periférica/fisiopatologia , Reoperação , Estudos Retrospectivos , Fatores de Risco , Fatores de Tempo , Resultado do Tratamento , Grau de Desobstrução Vascular
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA