PHYSIOLOGICAL BENEFITS OF EXERCISE IN ARTIFICIAL GRAVITY: A BROADBAND COUNTERMEASURE TO SPACE FLIGHT RELATED DECONDITIONING

摘要

Current countermeasures to space flight related physiological deconditioning have not been sufficiently effective. We believe that a comprehensive countermeasure is the combination of intermittent centrifugation (artificial gravity) and exercise. We aim to test the long-term effectiveness of this combination in terms of fitness benefits. As a first-order determination of effectiveness, subjects are participating in a four- or eight-week exercise program. Three times per week, they exercise using a stair-stepper on a short-radius (2m) centrifuge spinning at 30 RPM, maintaining a target heart rate that is systematically increased over the exercise period. During the sessions, foot forces and stepping cadence, heart rate, and perceived exertion were measured. Before and after the four- or eight-week exercise program, measurements included: body fat percentage, lumbar bone mineral content, quadriceps extension strength, and heart rate and respiratory parameters for a given work rate. We find that stair-stepping on a centrifuge is safe and comfortable. Preliminary fitness results indicate that stair-stepping on a centrifuge may be effective in improving aerobic fitness, body composition, and strength. These results indicate that such a combination may also be effective as a countermeasure to space flight deconditioning.