From the National Research Centre for the Working Environment, Copenhagen, Denmark (MDJ, ES, CHA, LLA); Department of Psychology, Lund University, Lund, Sweden (RP); Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark (MDJ, ES); and Arthroscopic Centre Amager and Gait Analysis Laboratory, Copenhagen University Hospital, Hvidovre, Denmark (MKZ).
Am J Phys Med Rehabil. 2014 Apr;93(4):320-7. doi: 10.1097/PHM.0000000000000043.
The aim of this study was to evaluate muscle activity during hamstring rehabilitation exercises performed in training machine compared with elastic resistance.
Six women and 13 men aged 28-67 yrs participated in a crossover study. Electromyographic (EMG) activity was recorded in the biceps femoris and the semitendinosus during the concentric and the eccentric phase of hamstring curls performed with TheraBand elastic tubing and Technogym training machines and normalized to maximal voluntary isometric contraction-EMG (normalized EMG). Knee joint angle was measured using electronic inclinometers.
Training machines and elastic resistance showed similar high levels of muscle activity (biceps femoris and semitendinosus peak normalized EMG >80%). EMG during the concentric phase was higher than during the eccentric phase regardless of exercise and muscle. However, compared with machine exercise, slightly lower (P < 0.05) normalized EMG values were observed using elastic resistance at 30- to 50-degree knee joint angle for the semitendinosus and the biceps femoris during the concentric and the eccentric phase, respectively. Perceived loading (Borg CR10) was significantly higher (P < 0.001) during hamstring curl performed with elastic resistance (7.58 ± 0.08) compared with hamstring curl performed in a machine (5.92 ± 0.03).
Hamstring rehabilitation exercise performed with elastic resistance induces similar peak hamstring muscle activity but slightly lower EMG values at more extended knee angles and with higher perceived loading as hamstring curls using training machines.
本研究旨在评估在训练机上进行腘绳肌康复运动与弹性阻力训练时的肌肉活动。
6 名女性和 13 名年龄在 28-67 岁的男性参与了一项交叉研究。在进行半腱肌和股二头肌的向心和离心阶段时，使用 Theraband 弹性管和 Technogym 训练机记录肌电图（EMG）活动，并将其归一化为最大自主等长收缩-EMG（归一化 EMG）。使用电子倾角仪测量膝关节角度。
训练机和弹性阻力显示出相似的高肌肉活动水平（股二头肌和半腱肌峰值归一化 EMG>80%）。无论运动和肌肉如何，向心阶段的 EMG 都高于离心阶段。然而，与机器运动相比，在 30-50 度膝关节角度下，使用弹性阻力进行半腱肌和股二头肌的向心和离心阶段时，归一化 EMG 值略低（P<0.05）。在进行弹性阻力的半腱肌和股二头肌的向心和离心阶段时，感知负荷（Borg CR10）分别为 7.58±0.08，明显高于在机器上进行的半腱肌和股二头肌的向心和离心阶段（5.92±0.03）。
使用弹性阻力进行的腘绳肌康复运动可引起相似的峰值腘绳肌肌肉活动，但在膝关节角度更大和感知负荷更高的情况下，EMG 值略低，与使用训练机进行的腘绳肌卷曲运动相比。
