Wretling M L, Henriksson-Larsén K
Department of Clinical Physiology, University of Umeå, Sweden.
Int J Sports Med. 1998 Aug;19(6):401-7. doi: 10.1055/s-2007-971936.
The purpose of this study was to elucidate if the m. quadriceps femoris was fully activated during the first contractions of a series of repetitive maximal contractions and if there was any difference in the development of fatigue between sexes. To do this sixteen untrained subjects performed two series of contractions in an isokinetic dynamometer: one series of single maximum contractions and one series of repetitive maximum contractions. The EMG activity of m. vastus lateralis, m. vastus medialis and m. rectus femoris was recorded. The subjects were unable to perform maximum effort during the first repetitions of each trial, which might influence the results of fatigue studies, if these contractions are chosen as reference. We also found in contrast to other studies a decrease in RMS between the reference contraction and the fatigue level. We have not been able to display any difference between males and females during fatigue either in relative mechanical output nor in electromyographic parameters or experience in fatigue during isokinetic knee-extensions.
本研究的目的是阐明在一系列重复性最大收缩的首次收缩过程中股四头肌是否被充分激活，以及性别之间在疲劳发展方面是否存在差异。为此，16名未经训练的受试者在等速测力计上进行了两组收缩：一组单次最大收缩和一组重复性最大收缩。记录了股外侧肌、股内侧肌和股直肌的肌电图活动。在每个试验的首次重复过程中，受试者无法尽最大努力，若将这些收缩作为参考，可能会影响疲劳研究的结果。与其他研究相反，我们还发现参考收缩和疲劳水平之间的均方根值有所下降。在等速膝关节伸展过程中，无论是相对机械输出、肌电图参数还是疲劳体验方面，我们都未能显示出男性和女性在疲劳方面存在任何差异。
