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Related Experiment Videos

Altitude acclimatization attenuates plasma ammonia accumulation during submaximal exercise.

P M Young1, P B Rock, C S Fulco

  • 1Altitude Research Division, US Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1987
PubMed
Summary

Altitude acclimatization reduces plasma ammonia after exercise in active individuals. This adaptation may improve endurance and alter energy use during prolonged high-altitude exposure.

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Area of Science:

  • Exercise Physiology
  • Altitude Training
  • Human Performance

Background:

  • High altitude exposure significantly impacts physiological responses to exercise.
  • Understanding adaptations to altitude is crucial for athletes and military personnel.

Purpose of the Study:

  • To investigate the effects of acclimatization to 4,300 m on plasma ammonia concentrations during submaximal exercise.
  • To compare these effects between sedentary and active individuals.

Main Methods:

  • Subjects performed 30 min of submaximal cycle exercise (75% VO2max) at sea level and high altitude (4,300 m).
  • Plasma ammonia concentrations and maximal oxygen uptake (VO2max) were measured.
  • Participants were categorized into sedentary and active groups.

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Main Results:

  • VO2max decreased significantly with acute high altitude exposure in both groups.
  • The active group maintained VO2max with chronic exposure, unlike the sedentary group.
  • Post-exercise plasma ammonia increased with acute altitude exposure but decreased in the active group after chronic acclimatization.

Conclusions:

  • Altitude acclimatization, particularly in active individuals, leads to reduced post-exercise plasma ammonia accumulation.
  • This reduction in ammonia may enhance endurance capacity and modify substrate utilization during exercise at high altitude.