Striking muscle adaptations induced by volume-dependent repeated bouts of low-intensity eccentric exercise of the elbow flexors

Trevor C. Chen*, Wei Chin Tseng, Hsin Lian Chen, Kuo Wei Tseng, Tai Ying Chou, Yuh Chuan Huang, Kazunori Nosaka

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

2 引文 斯高帕斯(Scopus)

摘要

We investigated the effects of repeating 30 low-intensity eccentric contractions with a dumbbell corresponding to 10% maximal isometric strength (10%EC) on muscle strength and hypertrophy, and muscle damage after 30 maximal eccentric contractions (MaxEC) of the elbow flexors. Young men were placed into 1 of 3 experimental groups that performed 10%EC either once, twice a week for 4 (8 bouts) or 8 weeks (16 bouts) before MaxEC, or a control group that performed 2 bouts of MaxEC separated by 2 weeks (n = 13/group). Repeating 16 bouts of 10%EC increased (P < 0.05) maximal voluntary contraction strength (30 6 21%) and muscle thickness (4.2 6 2.3%) greater than 8 bouts (16 6 4%, 1.9 6 1.3%). Changes in the muscle damage markers after MaxEC were smaller (P < 0.05) for the experimental groups than the control group, and the magnitude of muscle damage protection was greater (P < 0.05) after 16 bouts (65 6 30%) than 8 bouts (55 6 33%), followed by 1 bout (34 6 27%). The protection by 16 bouts was similar (P = 0.81) to that shown by the second MaxEC of the control group. These results showed that 10%EC produced potent muscle adaptation effects accumulatively and conferred muscle damage protection, but 1 bout of 10%EC was still effective for conferring approximately 20% of the protection of that by 16 bouts. Novelty: Repeating low-intensity eccentric exercise induces large increases in muscle strength and hypertrophy. Low-intensity eccentric exercise protects muscle damage induced by maximal eccentric contractions, and the protection is reinforced by repeating it. These are especially beneficial for individuals who are frail and cannot tolerate high-intensity resistance training.

原文英語
頁(從 - 到)897-905
頁數9
期刊Applied Physiology, Nutrition and Metabolism
46
發行號8
DOIs
出版狀態已發佈 - 2021

ASJC Scopus subject areas

  • 內分泌學、糖尿病和代謝
  • 生理學
  • 營養與營養學
  • 生理學(醫學)

指紋

深入研究「Striking muscle adaptations induced by volume-dependent repeated bouts of low-intensity eccentric exercise of the elbow flexors」主題。共同形成了獨特的指紋。

引用此