Ventilation after Supplemental Oxygen Administration at High Altitude

Stephen R. Muza, Andrew J. Young, Michael N. Sawka, Vincent A. Forte, Paul Rock, Charles S. Fulco, Allen Cymerman

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Objective.-The present study assessed the effects of acute hyperoxia on resting-minute ventilation (V̇E) during altitude acclimatization to 4300 m. Methods.-Resting-minute ventilation, end-tidal partial pressure carbon dioxide (PETCO2) and oxygen (PETO2), and arterial oxygen saturation (SpO2) were measured during chronic poikilocapnic hypobaric hypoxia, supplemental oxygen breathing, and the subsequent return to hypobaric poikilocapnic hypoxia at altitude. Fifteen adult male lowlanders were studied at sea level and on the 3rd and 12th days at 4300 m. At sea level, subjects first breathed room air that was followed by 25-minute steady-state poikilocapnic hypoxia (FIO2 = 0.125). Ventilatory responses to acute poikilocapnic hypoxia (APH) were collected over the first 1-10 minutes, and responses to chronic poikilocapnic hypoxia (CPH) were collected over the last 3 minutes of the hypoxia exposure. At altitude, CPH was provided by ambient-air breathing (PIO2 = 86 mm Hg) that was interrupted by 10 minutes of oxygen breathing (FIO2 = 1.0, PIO 2 = 460 mm Hg) and then a subsequent return to ambient air to measure APH ventilatory responses. Results.-Between day 1 and day 12, during CPH, V̇E and SpO2 increased (P < .05) by 46% and 6%, respectively, whereas PETCO2 decreased. On day 3 and day 12, breathing oxygen did not lower V̇E compared with CPH. However, the V̇E during APH immediately after oxygen breathing at high altitude was always greater (P < .05) than during CPH and did not change with duration of residence at altitude. Conclusions.-These results show that short-duration oxygen breathing increases the subsequent ventilatory response to poikilocapnic hypoxia in altitude-acclimatized lowlanders, resulting in a transient elevation of SpO2.

Original languageEnglish
Pages (from-to)18-24
Number of pages7
JournalWilderness and Environmental Medicine
Volume15
Issue number1
DOIs
StatePublished - 1 Jan 2004

Fingerprint

Ventilation
Oxygen
Respiration
Altitude Sickness
Air
Oceans and Seas
Hypoxia
Hyperoxia
Partial Pressure
Acclimatization
Carbon Dioxide

Keywords

  • Altitude
  • Hypoxic ventilatory decline
  • Hypoxic ventilatory response
  • Oxygen
  • Poikilocapnic response
  • Ventilatory acclimatization

Cite this

Muza, Stephen R. ; Young, Andrew J. ; Sawka, Michael N. ; Forte, Vincent A. ; Rock, Paul ; Fulco, Charles S. ; Cymerman, Allen. / Ventilation after Supplemental Oxygen Administration at High Altitude. In: Wilderness and Environmental Medicine. 2004 ; Vol. 15, No. 1. pp. 18-24.
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abstract = "Objective.-The present study assessed the effects of acute hyperoxia on resting-minute ventilation (V̇E) during altitude acclimatization to 4300 m. Methods.-Resting-minute ventilation, end-tidal partial pressure carbon dioxide (PETCO2) and oxygen (PETO2), and arterial oxygen saturation (SpO2) were measured during chronic poikilocapnic hypobaric hypoxia, supplemental oxygen breathing, and the subsequent return to hypobaric poikilocapnic hypoxia at altitude. Fifteen adult male lowlanders were studied at sea level and on the 3rd and 12th days at 4300 m. At sea level, subjects first breathed room air that was followed by 25-minute steady-state poikilocapnic hypoxia (FIO2 = 0.125). Ventilatory responses to acute poikilocapnic hypoxia (APH) were collected over the first 1-10 minutes, and responses to chronic poikilocapnic hypoxia (CPH) were collected over the last 3 minutes of the hypoxia exposure. At altitude, CPH was provided by ambient-air breathing (PIO2 = 86 mm Hg) that was interrupted by 10 minutes of oxygen breathing (FIO2 = 1.0, PIO 2 = 460 mm Hg) and then a subsequent return to ambient air to measure APH ventilatory responses. Results.-Between day 1 and day 12, during CPH, V̇E and SpO2 increased (P < .05) by 46{\%} and 6{\%}, respectively, whereas PETCO2 decreased. On day 3 and day 12, breathing oxygen did not lower V̇E compared with CPH. However, the V̇E during APH immediately after oxygen breathing at high altitude was always greater (P < .05) than during CPH and did not change with duration of residence at altitude. Conclusions.-These results show that short-duration oxygen breathing increases the subsequent ventilatory response to poikilocapnic hypoxia in altitude-acclimatized lowlanders, resulting in a transient elevation of SpO2.",
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Ventilation after Supplemental Oxygen Administration at High Altitude. / Muza, Stephen R.; Young, Andrew J.; Sawka, Michael N.; Forte, Vincent A.; Rock, Paul; Fulco, Charles S.; Cymerman, Allen.

In: Wilderness and Environmental Medicine, Vol. 15, No. 1, 01.01.2004, p. 18-24.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ventilation after Supplemental Oxygen Administration at High Altitude

AU - Muza, Stephen R.

AU - Young, Andrew J.

AU - Sawka, Michael N.

AU - Forte, Vincent A.

AU - Rock, Paul

AU - Fulco, Charles S.

AU - Cymerman, Allen

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N2 - Objective.-The present study assessed the effects of acute hyperoxia on resting-minute ventilation (V̇E) during altitude acclimatization to 4300 m. Methods.-Resting-minute ventilation, end-tidal partial pressure carbon dioxide (PETCO2) and oxygen (PETO2), and arterial oxygen saturation (SpO2) were measured during chronic poikilocapnic hypobaric hypoxia, supplemental oxygen breathing, and the subsequent return to hypobaric poikilocapnic hypoxia at altitude. Fifteen adult male lowlanders were studied at sea level and on the 3rd and 12th days at 4300 m. At sea level, subjects first breathed room air that was followed by 25-minute steady-state poikilocapnic hypoxia (FIO2 = 0.125). Ventilatory responses to acute poikilocapnic hypoxia (APH) were collected over the first 1-10 minutes, and responses to chronic poikilocapnic hypoxia (CPH) were collected over the last 3 minutes of the hypoxia exposure. At altitude, CPH was provided by ambient-air breathing (PIO2 = 86 mm Hg) that was interrupted by 10 minutes of oxygen breathing (FIO2 = 1.0, PIO 2 = 460 mm Hg) and then a subsequent return to ambient air to measure APH ventilatory responses. Results.-Between day 1 and day 12, during CPH, V̇E and SpO2 increased (P < .05) by 46% and 6%, respectively, whereas PETCO2 decreased. On day 3 and day 12, breathing oxygen did not lower V̇E compared with CPH. However, the V̇E during APH immediately after oxygen breathing at high altitude was always greater (P < .05) than during CPH and did not change with duration of residence at altitude. Conclusions.-These results show that short-duration oxygen breathing increases the subsequent ventilatory response to poikilocapnic hypoxia in altitude-acclimatized lowlanders, resulting in a transient elevation of SpO2.

AB - Objective.-The present study assessed the effects of acute hyperoxia on resting-minute ventilation (V̇E) during altitude acclimatization to 4300 m. Methods.-Resting-minute ventilation, end-tidal partial pressure carbon dioxide (PETCO2) and oxygen (PETO2), and arterial oxygen saturation (SpO2) were measured during chronic poikilocapnic hypobaric hypoxia, supplemental oxygen breathing, and the subsequent return to hypobaric poikilocapnic hypoxia at altitude. Fifteen adult male lowlanders were studied at sea level and on the 3rd and 12th days at 4300 m. At sea level, subjects first breathed room air that was followed by 25-minute steady-state poikilocapnic hypoxia (FIO2 = 0.125). Ventilatory responses to acute poikilocapnic hypoxia (APH) were collected over the first 1-10 minutes, and responses to chronic poikilocapnic hypoxia (CPH) were collected over the last 3 minutes of the hypoxia exposure. At altitude, CPH was provided by ambient-air breathing (PIO2 = 86 mm Hg) that was interrupted by 10 minutes of oxygen breathing (FIO2 = 1.0, PIO 2 = 460 mm Hg) and then a subsequent return to ambient air to measure APH ventilatory responses. Results.-Between day 1 and day 12, during CPH, V̇E and SpO2 increased (P < .05) by 46% and 6%, respectively, whereas PETCO2 decreased. On day 3 and day 12, breathing oxygen did not lower V̇E compared with CPH. However, the V̇E during APH immediately after oxygen breathing at high altitude was always greater (P < .05) than during CPH and did not change with duration of residence at altitude. Conclusions.-These results show that short-duration oxygen breathing increases the subsequent ventilatory response to poikilocapnic hypoxia in altitude-acclimatized lowlanders, resulting in a transient elevation of SpO2.

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KW - Hypoxic ventilatory decline

KW - Hypoxic ventilatory response

KW - Oxygen

KW - Poikilocapnic response

KW - Ventilatory acclimatization

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