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首页> 外文期刊>European journal of applied physiology >Biomechanics of handcycling propulsion in a 30-min continuous load test at lactate threshold: Kinetics, kinematics, and muscular activity in able-bodied participants
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Biomechanics of handcycling propulsion in a 30-min continuous load test at lactate threshold: Kinetics, kinematics, and muscular activity in able-bodied participants

机译：在乳酸阈值30分钟连续载载试验中的手环推进的生物力学：能够身体参与者的动力学，运动学和肌肉活动

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Purpose This study aims to investigate the biomechanics of handcycling during a continuous load trial (CLT) to assess the mechanisms underlying fatigue in upper body exercise. Methods Twelve able-bodied triathletes performed a 30-min CLT at a power output corresponding to lactate threshold in a racing recumbent handcycle mounted on a stationary ergometer. During the CLT, ratings of perceived exertion (RPE), tangential crank kinetics, 3D joint kinematics, and muscular activity of ten muscles of the upper extremity and trunk were examined using motion capturing and surface electromyography. Results During the CLT, spontaneously chosen cadence and RPE increased, whereas crank torque decreased. Rotational work was higher during the pull phase. Peripheral RPE was higher compared to central RPE. Joint range of motion decreased for elbow-flexion and radial-duction. Integrated EMG (iEMG) increased in the forearm flexors, forearm extensors, and M. deltoideus (Pars spinalis). An earlier onset of activation was found for M. deltoideus (Pars clavicularis), M. pectoralis major, M. rectus abdominis, M. biceps brachii, and the forearm flexors. Conclusion Fatigue-related alterations seem to apply analogously in handcycling and cycling. The most distal muscles are responsible for force transmission on the cranks and might thus suffer most from neuromuscular fatigue. The findings indicate that peripheral fatigue (at similar lactate values) is higher in handcycling compared to leg cycling, at least for inexperienced participants. An increase in cadence might delay peripheral fatigue by a reduced vascular occlusion. We assume that the gap between peripheral and central fatigue can be reduced by sport-specific endurance training.
机译：目的本研究旨在在连续载荷试验（CLT）期间调查手工的生物力学，以评估上身运动中疲劳的机制。方法12个能够在安装在固定的测力计上的赛车躺椅中对应于乳酸阈值的动力输出的30分钟的CLT。在CLT期间，使用运动捕获和表面肌电学，检查了感知劳动（RPE），切向曲柄动力学，3D关节运动学和躯干的十个肌肉的肌肉活动的评级。在CLT期间的结果，自发选择的节奏和RPE增加，而曲柄扭矩降低。拉阶段旋转工作较高。与中央RPE相比，外周RPE较高。用于弯头屈曲和径向延伸的关节运动范围减少。在前臂屈肌，前臂伸肌和M. deltoideus（Pars Spinalis）中，集成的EMG（IEMG）增加。发现早期的活化发作，用于M. deltoideus（Pars clavicularis），M.pectralis Major，M. rectus abdominis，M.二头肌Brachii和前臂屈肌。结论疲劳相关的改变似乎类似于手环和循环。最远端肌肉负责曲柄上的力传递，因此可能因神经肌肉疲劳而受到影响。结果表明，与腿部循环相比，外周疲劳（在类似的乳酸值）中较高，至少对于缺乏经验的参与者。减少血管闭塞的慢性疲劳可能会增加外周疲劳。我们假设外围和中央疲劳之间的间隙可以通过体育特异性耐力训练来减少。

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