Effect of conditioning contraction intensity on postactivation potentiation is muscle dependent
Effect of conditioning contraction intensity on postactivation potentiation is muscle dependent
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DOI：
10.1016/j.jelekin.2014.01.002
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发表时间：
2014-04-01
影响因子：
2.5
通讯作者：
Kawakami, Yasuo
中科院分区：
文献类型：
--
作者：
Fukutani, Atsuki;Hirata, Kosuke;Kawakami, Yasuo
我们的目的是研究条件反射收缩强度对激活后增强（PAP）程度的影响是否依赖于肌肉。11名健康男性同时进行拇指内收和足底屈曲作为条件收缩。条件反射收缩强度设定为最大自主等距收缩（MVC）的20%、40%、60%、80%或100%。在调理收缩前后，分别测量各关节的抽搐力矩，计算PAP的程度。在足底屈曲时，当调节收缩强度增加到80% MVC时，PAP的程度显著变大（p < 0.05）。相比之下，只有在60%的MVC下，拇指内收的PAP程度才显著增加（p < 0.05），但在更高的强度下则没有增加。这些结果表明，调节收缩强度对PAP程度的影响是肌肉依赖性的。我们的研究结果表明，具有次最大强度的条件收缩可以充分唤起肌肉中相当大的PAP，其中大多数肌纤维以次最大强度被招募，从而减轻由条件收缩引起的肌肉疲劳。(C) 2014 Elsevier Ltd.版权所有。
We aimed to examine whether the influence of conditioning contraction intensity on the extent of post-activation potentiation (PAP) is muscle dependent. Eleven healthy males performed both thumb adduction and plantar flexion as a conditioning contraction. The conditioning contraction intensities were set at 20%, 40%, 60%, 80%, or 100% of the maximal voluntary isometric contraction (MVC).Before and after the conditioning contraction, twitch torque was measured for the respective joint to calculate the extent of PAP. In plantar flexion, the extent of PAP became significantly larger as the conditioning contraction intensity increased up to 80% MVC (p < 0.05). In contrast, the extent of PAP in thumb adduction increased significantly only up to 60% MVC (p < 0.05), but not at higher intensities.These results indicate that the influence of the conditioning contraction intensity on the extent of PAP is muscle dependent. Our results suggest that a conditioning contraction with submaximal intensity can sufficiently evoke sizable PAP in the muscle where most of muscle fibers are recruited at submaximal intensities, thereby attenuating muscle fatigue induced by the conditioning contraction. (C) 2014 Elsevier Ltd. All rights reserved.