Bergström M, Hultman E
Acta Physiol Scand. 1986 May;127(1):107-10. doi: 10.1111/j.1748-1716.1986.tb07881.x.
Force and relaxation time were measured during intermittent electrical stimulation of the quadriceps muscle on 14 volunteers. Each stimulation had a duration of 1.6 s and the work to rest ratio was 1:1. Relaxation times increased during the first 20-30 contractions and then reached a plateau. The rate of increase in relaxation time during the first contractions as well as the plateau levels were found to correlate to maximal oxygen uptake capacity, predicted from submaximal cycle ergometer tests. Since slow-twitch fibres are known to produce work at a lower energy cost it is suggested that studies of relaxation time changes could provide functional estimates of fibre-type proportions in the quadriceps muscle.
在对14名志愿者的股四头肌进行间歇性电刺激期间，测量了力量和放松时间。每次刺激持续1.6秒，工作与休息的比例为1:1。放松时间在最初的20 - 30次收缩期间增加，然后达到平稳状态。发现最初收缩期间放松时间的增加速率以及平稳水平与通过次最大运动强度自行车测力计测试预测的最大摄氧量相关。由于已知慢肌纤维以较低的能量成本产生功，因此有人提出，对放松时间变化的研究可以提供股四头肌中纤维类型比例的功能估计。
