Journal article
Operation Everest II: An indication of deterministic chaos in human heart rate variability at simulated extreme altitude
Abstract
It has been shown that fluctuation of human heartbeat intervals (heart rate variability, HRV) reflects variations in autonomic nervous system activity. We studied HRV at simulated altitudes of over 6000 m from Holter electrocardiograms recorded during the Operation Everest II study (Houston et al. 1987). Stationary, ∼30-min segments of HRV data from six subjects at sea level and over 6000m were supplied to (1) spectral analysis to evaluate …
Authors
Yamamoto Y; Hughson RL; Sutton JR; Houston CS; Cymerman A; Fallen EL; Kamath MV
Journal
Biological Cybernetics, Vol. 69, No. 3, pp. 205–212
Publisher
Springer Nature
Publication Date
July 1993
DOI
10.1007/bf00198960
ISSN
0340-1200