EFFECTS OF LOW-LOAD, HIGHER-REPETITION VS. HIGH-LOAD, LOWER-REPETITION RESISTANCE TRAINING NOT PERFORMED TO FAILURE ON MUSCLE STRENGTH, MASS, AND ECHO INTENSITY IN HEALTHY YOUNG MEN: A TIME-COURSE STUDY
EFFECTS OF LOW-LOAD, HIGHER-REPETITION VS. HIGH-LOAD, LOWER-REPETITION RESISTANCE TRAINING NOT PERFORMED TO FAILURE ON MUSCLE STRENGTH, MASS, AND ECHO INTENSITY IN HEALTHY YOUNG MEN: A TIME-COURSE STUDY
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DOI：
10.1519/jsc.0000000000002278
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发表时间：
2020-12-01
影响因子：
3.2
通讯作者：
Ichihashi, Noriaki
中科院分区：
文献类型：
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作者：
Ikezoe, Tome;Kobayashi, Takuya;Ichihashi, Noriaki
本研究的目的是比较低负荷，高重复训练（LLHR）与高负荷，低重复训练（HLLR）对健康年轻男性肌肉力量，质量和回声强度的影响。15名健康男性（年龄23.1 ± 2.6岁）被随机分配到两组中的一组：LLHR组或HLLR组。膝伸肌进行抗阻训练，每周3天，共8周。每2周评估一次重复最大（1 RM）力量、最大等长力量、肌肉厚度和股直肌超声检查的肌肉回声强度。方差分析表明，没有显着的组x时间的相互作用，只有一个显着的主要影响的时间观察到的所有变量。8周的抗阻训练使1 RM、最大等长肌力和肌肉厚度分别增加36.2- 40.9%、24.0- 25.5%和11.3- 20.4%，而回声强度降低8.05- 16.3%。分别在第2、4和8周观察到肌肉强度、厚度和回声强度的显著改善。LLHR和HLLR程序之间的时间过程变化缺乏差异表明，低负荷训练可以通过增加重复次数对肌肉质量和特征产生类似的影响，即使没有失败。
The aim of this study was to compare the effects of low-load, higher-repetition training (LLHR) with those of high-load, lower-repetition training (HLLR) on muscle strength, mass, and echo intensity in healthy young men. Fifteen healthy men (age, 23.1 +/- 2.6 years) were randomly assigned to 1 of the 2 groups: LLHR or HLLR group. Resistance training on knee extensor muscles was performed 3 days per week for 8 weeks. One repetition maximum (1RM) strength, maximum isometric strength, muscle thickness, and muscle echo intensity on ultrasonography of the rectus femoris muscle were assessed every 2 weeks. Analysis of variance showed no significant group x time interaction, and only a significant main effect of time was observed for all variables. The 8-week resistance training increased 1RM, maximum isometric muscle strength, and muscle thickness by 36.2-40.9%, 24.0-25.5%, and 11.3-20.4%, respectively, whereas it decreased echo intensity by 8.05-16.3%. Significant improvements in muscle strength, thickness, and echo intensity were observed at weeks 2, 4, and 8, respectively. The lack of difference in time-course changes between LLHR and HLLR programs suggests that low-load training can exert similar effects on muscle mass and characteristics as high-load training by increasing the number of repetitions, even when not performed to failure.