- 期刊
Effects of a Single Bout of Intensive Eccentric Contractions at Varying Repetitions on Muscle Damage
單一回合不同反複次數的離心收縮運動對肌肉損傷的影響
摘要
This study examined whether performing different repetitions of a single bout of eccentric contractions would cause differing magnitudes of muscle damage and result in different recovery rates. A group of college-age male students (N=36) was recruited for the study. were randomly assigned into 24 (EC24; n=12), 50 (EC50 n=12), They and 70 (EC7O; n=12) eccentric exercise groups. A single bout of intensive eccentric exercise (EGG) was 24, 50, and 70 repetitions for EG24, EG50, and EG70, respectively, on nondominant elbow flexors using a dumbbell that was set at 80% of the pre-ECC MIF level. Upper arm circumference (CIR), ROM, MIF and plasma CK activity were measured before and immediately after ECC, and every 24 hours for 9 consecutive days after EGG for all groups. Muscle soreness was assessed before and for 9 consecutive days after ECC for all groups. There were significant changes (p＜.05) in all criterion measures following ECC for all groups. There were dramatic changes (p＜.05) in MIF ROM, GIR, and CK for EC70 as compared to EG50 and EG24 following ECC. Moreover there were no significant changes (p＞.05) after ECC among groups Furthermore, the recovery rate of MIF ROM, CIR, and CK for ECC for EC70 was slower after ECC among groups. Furthermore, the recovery rate of MIF ROM, CIR, and CK following ECC for EG70 was slower (p＜.05) than the EC50 and EC24 groups; and EG50 had a significantly slower (MIF, ROM, CIR, CK, p＜.05) recovery rate from muscle damage after ECC than EC24. The results of the present study showed that the larger the number of eccentric contractions, the greater the changes (p＜.05) in criterion measures (MIF, ROM, CIR, CK) and the slower the recovery rate (p＜.05) of muscle damage after ECC. Moreover there was a significant increase (p＜.05) in soreness following ECC for all groups. Therefore, this may provide a possible explanation for the different magnitude of muscle damage from ECC and the different recovery rate of muscle damage after ECC for each group. However muscle soreness following ECC showed no significant differences (p＞.05) among groups. Furthermore, use of muscle soreness may not a good indicator of exercise-induced muscle damage, and changes in indirect indicators of muscle damage are not necessarily accompanied with muscle soreness.
並列摘要
This study examined whether performing different repetitions of a single bout of eccentric contractions would cause differing magnitudes of muscle damage and result in different recovery rates. A group of college-age male students (N=36) was recruited for the study. were randomly assigned into 24 (EC24; n=12), 50 (EC50 n=12), They and 70 (EC7O; n=12) eccentric exercise groups. A single bout of intensive eccentric exercise (EGG) was 24, 50, and 70 repetitions for EG24, EG50, and EG70, respectively, on nondominant elbow flexors using a dumbbell that was set at 80% of the pre-ECC MIF level. Upper arm circumference (CIR), ROM, MIF and plasma CK activity were measured before and immediately after ECC, and every 24 hours for 9 consecutive days after EGG for all groups. Muscle soreness was assessed before and for 9 consecutive days after ECC for all groups. There were significant changes (p＜.05) in all criterion measures following ECC for all groups. There were dramatic changes (p＜.05) in MIF ROM, GIR, and CK for EC70 as compared to EG50 and EG24 following ECC. Moreover there were no significant changes (p＞.05) after ECC among groups Furthermore, the recovery rate of MIF ROM, CIR, and CK for ECC for EC70 was slower after ECC among groups. Furthermore, the recovery rate of MIF ROM, CIR, and CK following ECC for EG70 was slower (p＜.05) than the EC50 and EC24 groups; and EG50 had a significantly slower (MIF, ROM, CIR, CK, p＜.05) recovery rate from muscle damage after ECC than EC24. The results of the present study showed that the larger the number of eccentric contractions, the greater the changes (p＜.05) in criterion measures (MIF, ROM, CIR, CK) and the slower the recovery rate (p＜.05) of muscle damage after ECC. Moreover there was a significant increase (p＜.05) in soreness following ECC for all groups. Therefore, this may provide a possible explanation for the different magnitude of muscle damage from ECC and the different recovery rate of muscle damage after ECC for each group. However muscle soreness following ECC showed no significant differences (p＞.05) among groups. Furthermore, use of muscle soreness may not a good indicator of exercise-induced muscle damage, and changes in indirect indicators of muscle damage are not necessarily accompanied with muscle soreness.
延伸閱讀
- 何智巧、陳信良、陳忠慶、林明儒（2015）。離心運動引起不同程度延遲性肌肉酸痛與肌肉損傷指標反應之間的關係。嘉大體育健康休閒期刊，14(2)，140-152。https://doi.org/10.6169/NCYUJPEHR.14.2.12
- 陳忠慶、陳信良、鍾承融、吳昶潤（2007）。不同肌力測驗方式對評估離心運動引起肌肉損傷反應的比較。大專體育學刊，9(2)，117-129。https://doi.org/10.5297/ser.200706_9(2).0010
- 林明儒、藍宇斌、吳昶潤、吳慧君、林正常（2013）。不同最大等速離心運動對膝伸肌群引起肌肉損傷的影響。成大體育學刊，45(1)，69-87。https://doi.org/10.6406/JNCKUPER.201304_45(1).0005
- 鄭立夫、梁凱柔、周台英、謝忠展、曾國維、曾暐晉、許聖宗（2020）。離心運動引起肌肉損傷對肌力參數的影響。運動生理暨體能學報，()，21-31。https://doi.org/10.6127/JEPF.202006_(30).0003
- Chen, T. C. C., & Lee, P. H. (2003). 反複最大自主性離心收縮訓練對肌肉損傷和肌肉功能的影響. Annual Journal of Physical Education and Sports Science, (3), 73-87. https://doi.org/10.6694/JPESS.200312_(3).0007