Acute Effects of Passive Stretching on the Electromechanical Delay and Evoked Twitch Properties: A Gender Comparison

作者：Costa Pablo B^*; Ryan Eric D; Herda Trent J; Walter Ashley A; Hoge Katherine M; Cramer Joel T

来源：Journal of Applied Biomechanics, 2012, 28(6): 645-654.

DOI：10.1123/jab.28.6.645

• electromyography
• rate of force development
• electrical stimulation
• mechanical properties
• muscle mechanics

This study examined the acute effects of passive stretching on electromechanical delay (EMD), peak twitch force (PTF), rate of force development (RFD), and peak-to-peak M-wave (PPM) for the soleus muscle during evoked isometric plantar flexion muscle actions. Fourteen men (mean age +/- SD = 21.2 +/- 2.4 years; body mass = 80.0 +/- 14.9 kg; height = 176.9 +/- 7.2 cm) and 20 women (20.9 +/- 2.5 years; 61.3 +/- 8.9 kg; 165.3 +/- 7.5 cm) volunteered for the study. Five single-square, supramaximal transcutaneous electrical stimuli (each separated by 5 s) were delivered to the tibial nerve before and after passive stretching. A time x gender interaction was observed for EMD, and the post hoc dependent-samples t tests indicated that EMD increased 4% for the women (p = .023), but not for the men (p = .191). There were no other stretching-related changes for PTF, RFD, or p-p M-wave for either the men or women (p %26gt; .05). These findings tentatively suggested that mechanical factors related to the stiffness of the muscle-tendon unit may contribute to the explanation for why stretching caused an acute increase in the EMD during evoked twitches in the women, but not in the men.

• 出版日期2012-12