利き腕,非利き腕運動時の筋交感神経活動に対するレジスタンストレーニングの影響

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Previously, we observed that the metaboreflex increase in muscle sympathetic nerve activity (MSNA) during handgrip exercise was greater in the dominant arm (DA) than in the nondominant arm (NDA) (J Exercise Sports Physiol 13: 29-37, 2006). This study tested whether the MSNA response during handgrip exercise in the NDA is enhanced when forearm use is increased. Ten volunteers trained with a unilateral NDA handgrip exercise, which consisted of three sets of ten 10-second static contractions with maximal effort, 10 seconds apart, five days per week, for four weeks. The subjects performed rhythmic handgripping under forearm circulatory arrest with a maximal effort followed by two minutes of post-exercise arterial occlusion (PEAO) before and after training. MSNA was recorded from the tibial nerve using a microneurography and was expressed as the total activity (bursts × burst area). Handgrip force, heart rate (HR), and blood pressure were measured simultaneously. MSNA during the last 30 sec of the handgrip increased to 425% for the DA and 337% for the NDA from the resting value before training and to 485 and 374%, respectively, after training. The higher levels persisted during PEAO and was greater for the DA than for the NDA, while no significant difference was observed during exercise. The force output of the handgrip during exercise increased in the NDA after training, but not in the DA. No difference in the HR or blood pressure response between the arms during exercise and PEAO was found before and after training. This study demonstrated that the lower MSNA response to muscle contraction in the NDA did not increase after resistance training, suggesting that it is impossible to change the difference between the DA and NDA with short-term resistance training.
日本運動生理学会の論文
2006-09-30

利き腕,非利き腕運動時の筋交感神経活動に対するレジスタンストレーニングの影響

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