Inactivity and muscle: effect of resistance training during bed rest on muscle size in the lower limb
Inactivity and muscle: effect of resistance training during bed rest on muscle size in the lower limb
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DOI：
10.1046/j.1365-201x.2001.00869.x
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发表时间：
2001-08-01
期刊：
影响因子：
--
通讯作者：
Fukunaga, T
中科院分区：
文献类型：
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作者：
Akima, H;Kubo, K;Fukunaga, T
本研究旨在探讨动态压腿训练对人体下肢肌肉生理横截面积（PCSA）的影响，在20天的6度头低位卧床休息。5名健康男性组成了阻力训练组（BR-Tr），并使用先前两项研究的数据推导出10人对照组（BR-Cont）。BR-Tr在卧床休息期间每天进行两次动态腿部按压动作（上午和下午），包括膝关节伸展和跖屈：（1）以90%的最大负荷重复三组10次，（2）以40%的最大负荷重复至力竭。使用右大腿和腿的连续轴向磁共振（MR）图像估计膝伸肌（KE）、膝屈肌（KF）、跖屈肌（PF）和背屈肌群的PCSA。卧床休息期后，BR-Tr显示KE的PCSA显著增加。尽管两组KF的PCSA在卧床休息后显着下降，但占据KF约70%的BR-Tr中股二头肌（长头）和半腱肌的PCSA变化百分比显着高于BR-Cont。BR-Tr和BR-Cont组PF的PCSA均显著降低，幅度相似，分别为11.6%（P < 0.001）和11.9%（P < 0.001）。这些结果表明，卧床期间的动态压腿训练可以防止KE和部分KF的恶化，但不能防止小腿肌肉的恶化。
The present study aimed to investigate the effect of dynamic leg press training on the physiological cross-sectional areas (PCSAs) of human lower limb muscles during 20 days of 6 degrees head-down tilt bed rest. Five healthy men comprised the resistance training group (BR-Tr) and data from two previous studies were used to derive a 10-man control group (BR-Cont). The BR-Tr performed two sessions (morning and afternoon session) of dynamic leg press action including knee extension and plantar flexion daily for the bed rest period: (1) three sets of 10 repetitions at 90% of maximum load and (2) 40% of maximum load to exhaustion. The PCSAs of the knee extensor (KE), knee flexor (KF), plantar flexor (PF), and dorsiflexor muscle groups were estimated using serial axial magnetic resonance (MR) images of the right-thigh and leg. After the bed rest period, the BR-Tr showed a significant increase in the PCSA of the KE. Although PCSA of the KF in two groups significantly decreased after bed rest, percentage of change in PCSA of the biceps femoris (long head) and semitendinosus muscles in the BR-Tr, which occupied approximately 70% of the KF, was significantly higher than those in the BR-Cont. Both the BR-Tr and BR-Cont groups showed significant decreases in the PCSA of PF with similar magnitude of 11.6% (P < 0.001) and 11.9% (P < 0.001), respectively. These results suggest that dynamic leg press training during bed rest can prevent deteriorating of the KE and a part of KF, but not the calf muscles.