4.5 Article

Peak exercise oxygen uptake during and following long-duration spaceflight

期刊

JOURNAL OF APPLIED PHYSIOLOGY
卷 117, 期 3, 页码 231-238

出版社

AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.01251.2013

关键词

aerobic capacity; weightlessness; International Space Station

资金

  1. NASA Human Research Program

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This investigation was designed to measure aerobic capacity ((V) over dot O-2peak) during and after long-duration International Space Station (ISS) missions. Astronauts (9 males, 5 females: 49 +/- 5 yr, 77.2 +/- 15.1 kg, 40.6 +/- 6.4 ml.kg(-1).min (-1) [mean +/- SD]) performed peak cycle tests similar to 90 days before flight, 15 days after launch, every similar to 30 days in-flight, and on recovery days 1 (R + 1), R + 10, and R + 30. Expired metabolic gas fractions, ventilation, and heart rate (HR) were measured. Data were analyzed using mixed-model linear regression. The main findings of this study were that (V) over dot O-2peak decreased early in-flight (similar to 17%) then gradually increased during flight but never returned to preflight levels. (V) over dot O-2peak was lower on R + 1 and R + 10 than preflight but recovered by R + 30. Peak HR was not different from preflight at any time during or following flight. A sustained decrease in (V) over dot O-2peak during and/or early postflight was not a universal finding in this study, since seven astronauts were able to attain their preflight (V) over dot O-2peak levels either at some time during flight or on R + 1. Four of these astronauts performed in-flight exercise at higher intensities compared with those who experienced a decline in (V) over dot O-2peak , and three had low aerobic capacities before flight. These data indicate that, while (V) over dot O-2peak may be difficult to maintain during long-duration ISS missions, aerobic deconditioning is not an inevitable consequence of long-duration spaceflight.

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