Xenofondos Anthi, Patikas Dimitrios, Koceja David M, Behdad Tahayori, Bassa Eleni, Kellis Eleftherios, Kotzamanidis Christos
Laboratory of Coaching and Sport Performance, Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Serres, Greece.
Laboratory of Neuromechanics, Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Ag. Ioannis, 62110, Serres, Greece.
Muscle Nerve. 2015 Aug;52(2):252-9. doi: 10.1002/mus.24533. Epub 2014 Dec 16.
Our knowledge of the neurophysiology of post-activation potentiation (PAP) is limited. The purpose of this study was to examine the effect of PAP on twitch torque and H-reflex amplitude after a 10-s maximal voluntary contraction (MVC).
PAP measurements were assessed with the plantarflexors in a relaxed state and during a tonic contraction at 10% MVC.
The H-reflex/maximum M-wave ratio (H/M) decreased significantly (P<0.05) and returned to baseline levels after 1 min. The decrement in H/M was depressed when the plantarflexors were active at 10% MVC, and the depression was more obvious in the lateral gastrocnemius than in the soleus muscle.
The inhibition induced immediately after contraction could be attributed to post-activation depression. We conclude that PAP after a 10-s MVC cannot be attributed to increased motor neuron excitability through the reflex pathway as assessed by the H-reflex technique.
我们对激活后增强（PAP）神经生理学的了解有限。本研究的目的是检验10秒最大自主收缩（MVC）后PAP对抽搐扭矩和Hoffmann反射（H反射）波幅的影响。
在放松状态下以及在10%MVC的强直性收缩过程中，对跖屈肌进行PAP测量。
H反射与最大M波比值（H/M）显著降低（P<0.05），并在1分钟后恢复到基线水平。当跖屈肌以10%MVC的强度收缩时，H/M的降低受到抑制，并且在腓骨外侧肌中这种抑制比在比目鱼肌中更明显。
收缩后立即产生的抑制可能归因于激活后抑制。我们得出结论，10秒MVC后的PAP不能归因于通过H反射技术评估的反射通路中运动神经元兴奋性的增加。
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