Fugl-Meyer A R, Gerdle B, Eriksson B E, Jonsson B
Scand J Rehabil Med. 1985;17(2):47-52.
The reliability and validity of isokinetic measurement of plantar flexion endurance has been studied by a method previously described by us which utilizes simultaneous measurements of mechanical contractional work (CW) and integrated electromyogram (iEMG). The reliability was gauged by test/re-test with a two year's interval; while validity was assessed by myoelectric power spectrum analyses. The output/input balance (CW/iEMG) remained unchanged for the group as well as inter-individually. Changes in myoelectric power spectrum as function of number of contractions were clearly indicative of fatigue. Under the present conditions fatigue of fast twitch motor units may explain the rapid decreases in output and excitation followed by nearly steady state levels of all registered parameters. As is the case for non-fatigued isokinetic plantar flexions, the motor unit recruitment order appears quite stereotyped during plantar flexion fatigue. The findings of significantly lower mean power spectrum during the first part of each contraction than during the second part may support the size-principle described by Henneman.
我们之前描述的一种方法对跖屈耐力等速测量的可靠性和有效性进行了研究，该方法利用了对机械收缩功（CW）和积分肌电图（iEMG）的同步测量。通过间隔两年的重测来评估可靠性；而有效性则通过肌电功率谱分析来评估。该组以及个体间的输出/输入平衡（CW/iEMG）保持不变。肌电功率谱随收缩次数的变化清楚地表明了疲劳。在当前条件下，快肌运动单位的疲劳可能解释了输出和兴奋的快速下降，随后所有记录参数达到近乎稳定的水平。与非疲劳等速跖屈的情况一样，在跖屈疲劳期间运动单位的募集顺序似乎相当刻板。每次收缩第一部分的平均功率谱显著低于第二部分的这一发现可能支持亨内曼描述的大小原则。
