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Intermittent hypoxia does not increase exercise ventilation at simulated moderate altitude.

K Katayama1, K Sato, N Hotta

  • 1Research Center of Health, Physical Fitness and Sports, Nagoya University, Furocho, Chikusaku, Nagoya 464-8601, Japan. katayama@htc.nagoya-u.ac.jp

International Journal of Sports Medicine
|March 16, 2007
PubMed
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Intermittent hypoxia at rest did not enhance exercise ventilation at moderate altitude, despite increasing hypoxic ventilatory response (HVR) in some groups. This suggests resting chemosensitivity changes don't impact exercise performance at altitude.

Area of Science:

  • Exercise Physiology
  • Altitude Training
  • Respiratory Control

Background:

  • Intermittent hypoxia (IH) at rest can increase resting hypoxic ventilatory response (HVR).
  • Previous studies linked increased HVR to improved ventilation during exercise at simulated high altitude.
  • The effect of IH-induced HVR changes on exercise ventilation at moderate altitude remains unclear.

Purpose of the Study:

  • To investigate if IH at rest enhances exercise ventilation at moderate altitude.
  • To determine if IH-induced increases in hypoxic chemosensitivity correlate with exercise ventilation changes.

Main Methods:

  • Eighteen trained male runners participated in a 1-week intermittent hypoxia protocol.
  • Two groups received IH at simulated altitudes of 2500m (H-1) or 4300m (H-2) for 1 hour daily.

Related Experiment Videos

  • Resting HVR and exercise performance (ventilation, SaO2) at 2500m were measured before and after IH.

    • Main Results:

    • The H-2 group showed a significant increase in resting HVR post-IH (p < 0.05).
    • No significant changes in HVR were observed in the H-1 or control groups.
    • Neither ventilation nor arterial oxygen saturation (SaO2) during submaximal or maximal exercise at 2500m altitude changed in any group.

    Conclusions:

    • Short-term intermittent hypoxia at rest significantly increases resting hypoxic chemosensitivity at higher simulated altitudes (4300m).
    • However, this increase in resting chemosensitivity does not translate to improved ventilation during exercise at moderate altitude (2500m).
    • Resting hypoxic chemosensitivity may not be the primary determinant of exercise ventilation at moderate altitudes following IH.