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<p>Crewmembers on future Lunar and Mars surface missions will perform numerous surface exploration extravehicular activities (EVAs). NASA standards dictate a nominal upper limit to the inspired partial pressure of CO<sub>2</sub> (P<sub>I</sub>CO<sub>2</sub>) of 15 mmHg in spacesuits; however, there is no suited P<sub>I</sub>CO<sub>2</sub> standard for emergency or contingency EVA scenarios. A laboratory-based study was conducted to characterize physical and cognitive performance, and self-reported symptomology during a simulated emergency one-hour EVA return to habitat scenario while being exposed to different P<sub>I</sub>CO<sub>2</sub> levels. Fifteen healthy subjects (12 M/3 F) underwent 7 testing conditions (P<sub>I</sub>CO<sub>2</sub> of 0, 5, 10, 15, 20, 25, and 30 mmHg) using a single-blinded, repeated-measures, counterbalanced design. All subjects completed the simulated contingency EVA scenario at all P<sub>I</sub>CO<sub>2</sub> levels. Although statistically detectable dose-responses were observed in several variables, these changes did not reach levels associated with clinically or operationally relevant impairment during the one-hour exposures up to 30 mmHg P<sub>I</sub>CO<sub>2</sub>.</p>

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Effects of carbon dioxide on physical and cognitive performance in a simulated spacesuit contingency scenario

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月21日

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  • N. Keller,
  • S. Thoolen,
  • B. Siders,
  • P. Estep,
  • R. Scully,
  • B. D. Levine,
  • T. Babb,
  • J. Pawelczyk,
  • A. Baughman,
  • M. Basner,
  • M. Young,
  • L. Chappell,
  • J. Norcross,
  • K. Marshall-Goebel,
  • A. Garbino

摘要

Crewmembers on future Lunar and Mars surface missions will perform numerous surface exploration extravehicular activities (EVAs). NASA standards dictate a nominal upper limit to the inspired partial pressure of CO2 (PICO2) of 15 mmHg in spacesuits; however, there is no suited PICO2 standard for emergency or contingency EVA scenarios. A laboratory-based study was conducted to characterize physical and cognitive performance, and self-reported symptomology during a simulated emergency one-hour EVA return to habitat scenario while being exposed to different PICO2 levels. Fifteen healthy subjects (12 M/3 F) underwent 7 testing conditions (PICO2 of 0, 5, 10, 15, 20, 25, and 30 mmHg) using a single-blinded, repeated-measures, counterbalanced design. All subjects completed the simulated contingency EVA scenario at all PICO2 levels. Although statistically detectable dose-responses were observed in several variables, these changes did not reach levels associated with clinically or operationally relevant impairment during the one-hour exposures up to 30 mmHg PICO2.