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Related Experiment Videos

Heart rate variability during gravity transitions.

B Seps1, F Beckers, A E Aubert

  • 1Laboratory Experimental Cardiology, University Hospital Gasthuisberg, KU Leuven, Leuven, Belgium.

Computers in Cardiology
|December 23, 2003
PubMed
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Parabolic flights reveal autonomic nervous system changes during altered gravity. Standing position showed higher heart rate variability (HRV) in microgravity, suggesting frequency domain analysis is viable even with short data segments.

Area of Science:

  • * Human physiology
  • * Aerospace medicine
  • * Autonomic nervous system function

Background:

  • * Parabolic flights simulate microgravity and hypergravity, offering unique research opportunities.
  • * Previous time-domain analysis indicated altered vagal modulation in microgravity during standing.
  • * Frequency domain analysis of heart rate variability (HRV) was hypothesized to provide deeper insights.

Purpose of the Study:

  • * To investigate autonomic nervous system responses using frequency domain HRV during parabolic flight.
  • * To assess the feasibility of frequency analysis on ultra-short data segments.

Main Methods:

  • * Subjects underwent parabolic flights with alternating microgravity (0 g) and hypergravity (approx. 1.8 g) phases.
  • * Heart rate variability was analyzed in both supine and standing positions.

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  • * Frequency domain parameters (Total Power, HF, LF, LF/HF, HF%, LF%) were calculated for different gravity phases.

    • Main Results:

    • * No significant frequency parameter differences were observed in the supine position across gravity phases.
    • * In the standing position, microgravity (0 g) showed significantly higher Total Power, HF, LF, LF/HF, and HF% compared to other phases.
    • * Standing position at 0 g exhibited a significantly lower LF% compared to 1.8 g.

    Conclusions:

    • * Frequency domain HRV analysis is feasible and informative even with ultra-short data segments obtained during parabolic flights.
    • * Altered gravity significantly impacts autonomic nervous system regulation, particularly in the standing position.
    • * The findings highlight the sensitivity of HRV to gravitational changes and support its use in aerospace physiology research.