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Ventilatory acclimatization to hypoxia in mice: Methodological considerations.

Catherine M Ivy1, Graham R Scott1

  • 1Department of Biology, McMaster University, Hamilton, ON, Canada.

Respiratory Physiology & Neurobiology
|December 20, 2016
PubMed
Summary

Hypoxia acclimation enhances breathing and oxygen levels in mice. Measurement methods significantly impact observed ventilatory acclimatization to hypoxia (VAH) responses.

Keywords:
Gas exchangeHigh altitudeMouse strainRespirationTotal ventilation

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Area of Science:

  • Physiology
  • Environmental Medicine
  • Respiratory Physiology

Background:

  • Ventilatory acclimatization to hypoxia (VAH) is crucial for adapting to low oxygen environments.
  • Understanding VAH mechanisms is vital for managing high-altitude exposure and respiratory diseases.

Purpose of the Study:

  • To investigate ventilatory acclimatization to hypoxia (VAH) in CD1 mice.
  • To compare VAH responses measured by barometric methods versus pneumotachography.

Main Methods:

  • Assessed responses to progressive step reductions in oxygen (O2) fraction (21%-8%) in mice.
  • Utilized barometric methods on unrestrained mice and pneumotachography with pulse oximetry on restrained mice.
  • Included mice acclimated to normoxia and hypobaric hypoxia (60kPa for 6-8 weeks).

Main Results:

  • Hypoxia acclimation increased hypoxic ventilatory response, arterial O2 saturation (SaO2), heart rate, hypoxic chemosensitivity, and respiratory water loss.
  • Acclimation blunted the hypoxic depression of metabolism and body temperature.
  • Measurement methods influenced the magnitude and direction of observed VAH effects, with pneumotachography often showing greater effects.

Conclusions:

  • Hypoxia acclimation significantly alters physiological responses to low oxygen.
  • The choice of measurement technique critically impacts the assessment of ventilatory acclimatization to hypoxia.
  • Careful consideration of measurement methodology is essential for accurate VAH research.