Effect of strength training on the relationship between magnetic resonance relaxation time and muscle fibre composition
Effect of strength training on the relationship between magnetic resonance relaxation time and muscle fibre composition
复制标题
力量训练对磁共振松弛时间与肌纤维组成关系的影响
DOI：
10.1007/bf00236690
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Kunihiko Matsumoto
中科院分区：
文献类型：
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作者：
S. Kuno;S. Katsuta;M. Akisada;I. Anno;Kunihiko Matsumoto
研究了肌肉肥大对磁共振（MR）弛豫时间和肌纤维组成之间关系的影响。在 20 周的力量训练前后，测量了 5 名受试者的放松时间和肌肉纤维成分。经过 20 周的力量训练，所有受试者的肌纤维成分均表现出显着转变，以快肌 (FT) 纤维为主（FT 纤维面积百分比：平均值从 49.8%，SD 17.9% 至 57%，SD 5.6%；P<0.05）。力量训练后纵向松弛时间（T1）和横向松弛时间（T2）均显着延长（T1平均值为334.9 ms，SD 13.6～359.0 ms，SD 9.0，P<0.001；T2平均值为27.5 ms，SD 0.9～30.8 ms，SD 2.3，P<0.05）。在力量训练引起的肌纤维成分（%面积 FT）和放松时间的变化中观察到恒定的关系，两个参数之间具有高度相关性。这些结果表明 MR 弛豫时间可用于肌纤维成分的无创估计。
The effect of muscle hypertrophy on the relationship between magnetic resonance (MR) relaxation time and muscle fibre composition was investigated. Relaxation time and muscle fibre composition were measured in five subjects before and after a 20-week period of strength training. Muscle fibre composition in all subjects exhibited a significant shift to a predominance of fast-twitch (FT) fibres as a result of 20-week strength training (% area FT fibres: mean values from 49.8%, SD 17.9% to 57%, SD 5.6%;P<0.05). Longitudinal relaxation time (T1) and transverse relaxation time (T2) were prolonged significantly after strength training (T1mean values from 334.9 ms, SD 13.6 to 359.0 ms, SD 9.0,P<0.001; T2from 27.5 ms, SD 0.9 to 30.8 ms, SD 2.3,P<0.05). A constant relationship was observed in changes caused by strength training in muscle fibre composition (% area FT) and relaxation time, with a high correlation obtained between both parameters. These results indicate that MR relaxation time can be used for non-invasive estimation of muscle fibre composition.