Am J Physiol Heart Circ Physiol. 2009 Nov 13. [Epub ahead of print]
Aubert AE, Verheyden B, d'Ydewalle C, Beckers F, Van den Bergh O.
Sustained weightlessness affects all body functions, among these also cardiac autonomic control mechanisms. How this may influence neural response to central stimulation by a mental arithmetic task remains an open question. The hypothesis was tested that microgravity alters cardiovascular neural response to standardized cognitive load stimuli. Beat-to-beat heart rate, brachial blood pressure and respiratory frequency were collected in 5 astronauts, taking part in 3 different short duration (10-11 days) space missions to the International Space Station. Data recording was performed in supine position one month before launch, at day 5 or 8 in space, and on day 1, 14 and 25 days after landing. Heart rate variability parameters were obtained in the frequency domain...
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