Post-contraction potentiation can react inversely to post-activation potentiation depending on the test contraction force
Post-contraction potentiation can react inversely to post-activation potentiation depending on the test contraction force
复制标题
根据测试收缩力，收缩后增强可以与激活后增强反向反应
DOI：
10.1016/j.neulet.2023.137132
复制
发表时间：
2023
影响因子：
2.5
通讯作者：
Komiyama Tomoyoshi
中科院分区：
文献类型：
--
作者：
Ishii Tomoya;Sasada Syusaku;Komiyama Tomoyoshi
据报道，在弱屈肘期间肱二头肌的表面肌电图（EMG）活动在强屈肘后立即增加，即使在施加给定的力期间也是如此。这种现象被称为收缩后增强（EMG-PCP）。然而，测试收缩强度（TCI）对EMG-PCP的影响尚不清楚。该研究评估了不同总氯指数值下的五氯苯酚水平。16名健康参与者被要求在（测试1）和（测试2）条件收缩（MVC的50%）之前（测试1）和之后（测试2）执行力匹配任务（最大自主收缩[MVC]的2%，10%或20%）。在2% TCI下，测试2中的EMG振幅高于测试1。在20% TCI的情况下，测试2中的EMG振幅低于测试1。此外，EMG频谱分析表明，与测试1相比，测试2中的α和β频带功率比增强了2%TCI。这些研究结果表明，TCI是至关重要的，在确定肌电力的关系后，立即短暂的密集收缩。
The surface electromyographic (EMG) activity of the biceps brachii during weak elbow flexion reportedly increases immediately after strong elbow flexion, even during the exertion of a given force. This phenomenon is called post-contraction potentiation (EMG–PCP). However, the effects of test contraction intensity (TCI) on EMG–PCP remain unclear. This study evaluated PCP levels at various TCI values. Sixteen healthy participants were asked to perform a force matching task (2%, 10%, or 20% of the maximum voluntary contraction [MVC]) before (Test 1) and after (Test 2) a conditioning contraction (50% of MVC). With a 2% TCI, the EMG amplitude was higher in Test 2 than in Test 1. With a 20% TCI, the EMG amplitude was lower in Test 2 than in Test 1. Furthermore, EMG spectral analyses showed that the α- and β-band power ratios in Test 2 were enhanced by 2% TCI compared with Test 1. These findings suggest that TCI is crucial in determining the EMG–force relationship immediately after a brief intensive contraction.