Suzuki Y, Haruna Y, Kobayashi H, Kawakubo K, Goto S, Gunji A
Dept. of Health Administration, Univ. of Tokyo.
J Gravit Physiol. 1997 Jul;4(2):P123-4.
Due to prolonged bed rest (BR), maximal oxygen uptake (VO2max) might be decreased by above -8%, even if a moderate supine bicycle exercise (SBE) was performed for 45 to 60 minutes every day during BR. However, the decrement of VO2max was lowered to below -5% by isometric training and using a reverse gradient garment. Further it was rather slightly increased by SBE training with gradually increasing load from 40% to 90% VO2max. The facts suggest the dependency of the decrease of VO2max during BR on exercising muscle mass (MM) and strength. In the present study, therefore, the effects of isokinetic knee extension (Ik-KnE) training on VO2max, exercising MM and muscle contraction strength during BR were investigated. Then, the relationships between changes in VO2max and the muscle mass and strength were considered.
由于长期卧床休息（BR），最大摄氧量（VO2max）可能会下降超过8%，即使在卧床休息期间每天进行45至60分钟的适度仰卧位自行车运动（SBE）。然而，通过等长训练和使用反向梯度服装，VO2max的下降幅度降低到了-5%以下。此外，通过从40%VO2max逐渐增加到90%VO2max负荷的SBE训练，VO2max反而略有增加。这些事实表明，卧床休息期间VO2max的下降依赖于运动肌肉量（MM）和力量。因此，在本研究中，研究了等速膝关节伸展（Ik-KnE）训练对卧床休息期间VO2max、运动MM和肌肉收缩力量的影响。然后，考虑了VO2max变化与肌肉量和力量之间的关系。
