Key result
Continuous leg exercise at 600 kpm/min prevented circulatory collapse during +3 Gz gravitational stress, which otherwise occurred in 5 of 8 subjects during motionless resting.
Why the study?
Does leg exercise improve tolerance to exaggerated gravitational stress in subjects exposed to +3 Gz?
Does leg exercise improve tolerance to exaggerated gravitational stress in subjects exposed to +3 Gz?
Answers are grounded in this paper and cite their sources.
Leg exercise during exaggerated gravitational stress (+3 Gz) prevents circulatory collapse and improves circulatory stability.
Rosenhamer, G. Antigravity effects of leg exercise. Acta physiol. scand. 1968. 72. 72–80, To investigate the effects of leg exercise on the overall tolerance to exaggerated gravitational stress, 8 subjects were exposed for 13 min to a threefold increase of the force of gravity in centrifuge experiments (+ 3 Gz) while in the sitting position, both during motionless resting and when exercising at 600 kpm/min on a bicycle ergometer. In all subjects, continuous leg exercise prevented the occurrence of circulatory collapse. which otherwise became imminent in 5 subjects after 5 to 12 min in the resting condition as evidenced by blackout or rapid increase in heart rate. Subjectively, exercise was experienced as less stressful than the resting condition. The improved circulatory stability with exercise was also reflected by uniformity of individual heart rate responses, the group mean value increasing from 152 to 160 beats/min during the 6th to 12th min.
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G. Rosenhamer (1968) studied Exaggerated gravitational stress (n=8). Continuous leg exercise on a bicycle ergometer vs. Motionless resting was evaluated on Occurrence of circulatory collapse. Continuous leg exercise at 600 kpm/min prevented circulatory collapse during +3 Gz gravitational stress, which otherwise occurred in 5 of 8 subjects during motionless resting.
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