Prediction of muscle fiber composition using multiple repetition testing.
Prediction of muscle fiber composition using multiple repetition testing.
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使用多次重复测试预测肌纤维组成。
DOI：
10.5114/biolsport.2021.99705
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发表时间：
2021-06
期刊：
影响因子：
5.6
通讯作者：
Ahmetov II
中科院分区：
文献类型：
--
作者：
Hall ECR;Lysenko EA;Semenova EA;Borisov OV;Andryushchenko ON;Andryushchenko LB;Vepkhvadze TF;Lednev EM;Zmijewski P;Popov DV;Generozov EV;Ahmetov II
直接测定肌纤维成分是侵入性的，而且昂贵，间接方法也需要专家资源和专业知识。在80%1RM下进行抗阻运动被认为是间接估计肌纤维组成的一种手段，尽管这一假设从未被直接方法验证过。本研究的目的是探讨80%1RM后蹲练习完成重复次数与肌纤维组成之间的关系。测定30名娱乐活动参与者（10名女性，20名男性）的1 RM后蹲负荷，然后记录80%1RM的连续重复次数。观察了重复次数与股外侧肌快缩纤维百分比的关系。完成的重复次数范围为5 - 15次，与性别、年龄、1 RM、训练频率、训练类型、训练经验、BMI或肌纤维横截面积无关。快缩肌纤维的百分比与完成的重复次数呈负相关（r =-0.38，P = 0.039）。重复5 - 8次的受试者（n = 10）比重复11-15次的受试者（n = 11）有更多的快缩肌纤维（57.5 ± 9.5 vs 44.4 ± 11.9%，P = 0.013）。其余参与者重复9或10次（n = 9），平均具有相同比例的快肌纤维和慢肌纤维。总之，在80%的1 RM完成的重复次数与肌纤维成分中度相关。
Direct determination of muscle fiber composition is invasive and expensive, with indirect methods also requiring specialist resources and expertise. Performing resistance exercises at 80% 1RM is suggested as a means of indirectly estimating muscle fiber composition, though this hypothesis has never been validated against a direct method. The aim of the study was to investigate the relationship between the number of completed repetitions at 80% 1RM of back squat exercise and muscle fiber composition. Thirty recreationally active participants’ (10 females, 20 males) 1RM back squat load was determined, before the number of consecutive repetitions at 80% 1RM was recorded. The relationship between the number of repetitions and the percentage of fast-twitch fibers from vastus lateralis was investigated. The number of completed repetitions ranged from 5 to 15 and was independent of sex, age, 1RM, training frequency, training type, training experience, BMI or muscle fiber cross-sectional area. The percentage of fast-twitch muscle fibers was inversely correlated with the number of repetitions completed (r = –0.38, P = 0.039). Participants achieving 5 to 8 repetitions (n = 10) had significantly more fast-twitch muscle fibers (57.5 ± 9.5 vs 44.4 ± 11.9%, P = 0.013) than those achieving 11–15 repetitions (n = 11). The remaining participants achieved 9 or 10 repetitions (n = 9) and on average had equal proportion of fast- and slow-twitch muscle fibers. In conclusion, the number of completed repetitions at 80% of 1RM is moderately correlated with muscle fiber composition.
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作者：
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作者：
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