Carbon Monoxide Levels in the Extravehicular Mobility Unit by Modeling and Operational Testing

Makowski, Matthew; Norcross, Jason; Alexander, David; Sanders, Robert W.; Conkin, Johnny; Young, Millennia

doi:10.3357/amhp.5220.2019

Cited by 1 publication

(1 citation statement)

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“…ISS EVAs are long-duration activities (up to 8 hours) and require a high level of cognitive effort, but they are relatively low physical intensity (~30% of maximal effort) and infrequently performed (~3 EVAs per 6-month mission). Oxygen utilization is monitored during all ISS EVAs from a safety perspective and the overall EVA intensity is dependent on the crewmember and the specific tasks comprising the EVA 30 . In comparison, partial gravity EVAs on the lunar surface not only will be more frequent (up to 3 to 4/week, and up to 24 total hrs per week) and performed on unknown and irregular terrain, but also will require new unrehearsed tasks with complex logistics and a higher level of physical and cognitive demand for some tasks (e.g., ambulation, habitat construction, geological sampling).…”

Section: Discussionmentioning

confidence: 99%

Effects of exercise countermeasures on multisystem function in long duration spaceflight astronauts

et al. 2023

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Exercise training is a key countermeasure used to offset spaceflight-induced multisystem deconditioning. Here, we evaluated the effects of exercise countermeasures on multisystem function in a large cohort (N = 46) of astronauts on long-duration spaceflight missions. We found that during 178 ± 48 d of spaceflight, ~600 min/wk of aerobic and resistance exercise did not fully protect against multisystem deconditioning. However, substantial inter-individual heterogeneity in multisystem response was apparent with changes from pre to postflight ranging from −30% to +5%. We estimated that up to 17% of astronauts would experience performance-limiting deconditioning if current exercise countermeasures were used on future spaceflight missions. These findings support the need for refinement of current countermeasures, adjunct interventions, or enhanced requirements for preflight physiologic and functional capacity for the protection of astronaut health and performance during exploration missions to the moon and beyond.

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Section: Discussionmentioning

confidence: 99%