作者: H.E.J. Veeger , L.H.V. van der Woude , R.H. Rozendal
DOI: 10.1016/1050-6411(91)90014-V
关键词: Propulsion 、 Elbow 、 Mathematics 、 Manual wheelchair 、 Physical therapy 、 Wheelchair 、 Physical medicine and rehabilitation 、 Shoulder flexion 、 Electromyography 、 Pectoralis Muscle 、 Mechanical advantage 、 Biophysics 、 Clinical neurology 、 Neuroscience (miscellaneous)
摘要: Abstract To study joint contributions in manual wheelchair propulsion, we developed a three-dimensional model of the upper extremity. The was applied to data collected an experiment on ergometer which mechanical advantage (MA) manipulated. Five male able-bodied subjects performed two exercise tests (external power output P ext = 0.25–0.50 W · kg −1 ) against increasing speeds (1.11–1.39–1.67 m.s ), simulated MA 0.58–0.87. Results indicated decrease efficiency (ME) with that could not be related forces or torques. Increase increases On average, highest torques were noted shoulder flexion and adduction (35.6 24.6 N m at MA=0.58 0.50 ). Peak elbow extension −10.6 8.5 m. Based combination electromyographic (EMG) records extremity muscles, anterior deltoid pectoralis muscles are considered prime movers propulsion. Coordinative aspects propulsion concerning function (biarticular) directing propulsive redistribution closed chain discussed. We found no conclusive evidence for role extensors direction forces.