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Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
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Heart rate variability during two sequential mountaineering expeditions.

Yegor Tryliskyy1

  • 1Bogomolets National Medical University, Ostrovskogo 13, Kiev, Ukraine. yegor_triliskiy@ukr.net

Travel Medicine and Infectious Disease
|May 24, 2011
PubMed
Summary

Altitude acclimatization, assessed via heart rate variability and acute mountain sickness scores, was retained for at least 30 days after a 5360m expedition. This preserved acclimatization prevented significant physiological stress upon re-exposure to high altitude.

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Area of Science:

  • Physiology
  • Altitude Medicine
  • Mountaineering Science

Background:

  • Altitude acclimatization is crucial for high-altitude expeditions.
  • Understanding acclimatization retention is vital for safety and performance.
  • Previous research has not fully quantified acclimatization duration after extreme altitude exposure.

Purpose of the Study:

  • To assess the duration of altitude acclimatization retention after initial exposure to 5360m.
  • To evaluate physiological markers of acclimatization and de-acclimatization.
  • To investigate the impact of preserved acclimatization on subsequent high-altitude exposure.

Main Methods:

  • Spectral heart rate variability analysis was used to assess physiological stress.
  • Lake Louise Scoring System was employed to quantify acute mountain sickness.
  • Two sequential mountaineering expeditions to 5360m and 5642m with a 30-day interval were conducted.

Main Results:

  • Initial expedition showed varying heart rate variability alterations and acute mountain sickness.
  • Following a 30-day interval, heart rate variability normalized, and no acute mountain sickness was observed.
  • Acclimatization to 5360m was developed and preserved for 30 days, preventing significant physiological stress upon re-exposure.

Conclusions:

  • Altitude acclimatization to 5360m is retained for at least 30 days.
  • Preserved acclimatization effectively prevents acute mountain sickness and significant physiological stress.
  • This finding has implications for planning multi-stage high-altitude expeditions.