Effect of centrifuge-induced artificial gravity and ergometric exercise on cardiovascular deconditioning, myatrophy, and osteoporosis induced by a -6 degrees head-down bedrest
Iwase, S.; Takada, H.; Watanabe, Y.; Ishida, K.; Akima, H.; Katayama, K.; Iwase, M.; Hirayanagi, K.; Shiozawa, T.; Hamaoka, T.; Masuo, Y.; Custaud, M.-A.
Journal of Gravitational Physiology a Journal of the International Society for Gravitational Physiology 11(2): P243-P244
2004
ISSN/ISBN: 1077-9248 PMID: 16240530 Document Number: 572707
We have reported that centrifuge-induced artificial gravity with ergometric exercise could reduce developing cardiovascular deconditioning in humans. In the present study, we examined this load could prevent the myatrophy and osteoporosis induced by head-down bedrest for 20 days. Subjects were ten healthy male volunteers with informed consent. They were requested to lie down at -6 degrees for 20 days, and evaluation for cardiovascular deconditioning, myatrophy, and osteoporosis. As the result, high G-load with low intensity exercise suppressed the orthostatic intolerance and increase in serum osteoporotic marker, whereas low G-load with high intensity ergometric exercise maintained the maximal oxygen intake, heart dimension, and prevented myatrophy. The combination of high/low G-load with low/high intensity exercise will determine the optimal protocol for prevention of cardiovascular deconditioning, myatrophy, and osteoporosis.