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30 November 2010

Combined short-arm centrifuge and aerobic exercise training improves cardiovascular function and physical working capacity in humans

Chang-Bin YangABCDF, Shu ZhangABDE, Yu ZhangBC, Bing WangB, Yong-Jie YaoBE, Yong-Chun WangB, Yan-Hong WuB, Wen-Bin LiangE, Xi-Qing SunADEG

Med Sci Monit 2010; 16(12): CR575-583 :: ID: 881293

Abstract

Background: Musculoskeletal and cardiovascular deconditioning occurring in long-term spaceflight gives rise to the needs to develop new strategies to counteract these adverse effects. Short-arm centrifuge combined with ergometer has been proposed as a strategy to counteract adverse effects of microgravity. This study sought to investigate whether the combination of short-arm centrifuge and aerobic exercise training have advantages over short-arm centrifuge or aerobic exercise training alone.
Material/Methods: One week training was conducted by 24 healthy men. They were randomly divided into 3 groups: (1) short-arm centrifuge training, (2) aerobic exercise training, 40 W, and (3) combined short-arm centrifuge and aerobic exercise training. Before and after training, the cardiac pump function represented by stroke volume, cardiac output, left ventricular ejection time, and total peripheral resistance was evaluated. Variability of heart rate and systolic blood pressure were determined by spectral analysis. Physical working capacity was surveyed by near maximal physical working capacity test.
Results: The 1-week combined short-arm centrifuge and aerobic exercise training remarkably ameliorated the cardiac pump function and enhanced vasomotor sympathetic nerve modulation and improved physical working capacity by 10.9% (P<.05, n=8). In contrast, neither the short-arm centrifuge nor the aerobic exercise group showed improvements in these functions.
Conclusions: These results demonstrate that combined short-arm centrifuge and aerobic exercise training has advantages over short-arm centrifuge or aerobic exercise training alone in influencing several physiologically important cardiovascular functions in humans. The combination of short-arm centrifuge and aerobic exercise offers a promising countermeasure to microgravity.

Keywords: Heart Rate, Exercise - physiology, Centrifugation, Cardiac Output, Blood Pressure, Analysis of Variance, Hypogravity, Work Capacity Evaluation, young adult

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