Elsevier

Acta Astronautica

Volume 33, July 1994, Pages 101-111
Acta Astronautica

Part 1—Physiological response
Effects of daily mild supine exercise on physical performance after 20 days bed rest in young persons

https://doi.org/10.1016/0094-5765(94)90114-7Get rights and content

Abstract

To investgate the effects of daily mild supine exercise on physical performance capacity identified as maximal oxygen uptake rate (VO2max) after 20 days bed-rest, 3 male students performed a supine pedaling at 40 % intensity of VO2max for one hour every day, while 6 male and 5 female students were control. Before and after the bed-rest, muscle mass and strength of exercising leg and cardio-vascular responses during −40 mmHg lower body negative pressure (LBNP) and moderate upright cycling exercise were measured. Despite the exercise programme VO2max was similarly decreased to the control subjects after the bed-rest. The delta VO2max was correlated to delta % left ventricular fractional shortening during LBNP, and also % delta VO2max to % delta stroke volume of the moderate exercise (both p<0.05). The exercise programme should be too weak to maintain cardiovascular functions and thus to present the decrease in VO2max against pro-longed bed-rest as well as weightlessness stress.

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