Resumo

FERRETTI, Guido. The effects of microgravity exposure on maximal oxygen consumption in humans. Rev Cubana Invest Bioméd [online]. 2019, vol.38, n.3, e271.  Epub 01-Set-2019. ISSN 0864-0300.

After a short summary of the multifactorial models of maximal O2 consumption (VO2max) limitation, microgravity exposure is discussed as a convenient experimental condition to test these models. The following points are highlighted: 1) The decrease of (VO2max) in microgravity concerns specifically exercise performed in upright posture upon resumption of gravity exposure; 2) The decrease of (VO2max) after microgravity exposure has two components: one is fast and is related to cardiovascular adaptation, the other is slow and is related to the development of muscle atrophy; 3) (VO2max) does not decrease during microgravity or in supine posture upon resumption of gravity exposure, if the time in microgravity is sufficiently short; 4) cardiovascular oxygen transport accounts for 70% of (VO2max) limitation also after microgravity exposure.

Palavras-chave : microgravity; exercise; cardiovascular oxygen transport; muscle atrophy; models.

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