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Related Experiment Video

Updated: Mar 18, 2026

Experimental Protocol of a Three-minute, All-out Arm Crank Exercise Test in Spinal-cord Injured and Able-bodied Individuals

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[WORK-REST CYCLE OF COSMONAUTS IN MISSIONS 22/23-39/40 OF THE INTERNATIONAL SPACE STATION].

S I Stepanova, O I Karpova, V A Galichiy

Aviakosmicheskaia I Ekologicheskaia Meditsina = Aerospace and Environmental Medicine

|June 28, 2016

Summary

Russian astronauts on the International Space Station experienced demanding work schedules, with overwork common. Workload distribution improved in later years, potentially reducing critical stress levels during key operations.

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Last Updated: Mar 18, 2026

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Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

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Area of Science:

Space Medicine
Human Physiology in Space
Occupational Health

Context:

Analysis of Russian crewmembers' work-rest cycles (WRC) during 17 International Space Station (ISS) crew rotations (2010-2014).
Review of medical reports, overwork logs, and sleep shift data to assess WRC intensity.
Identification of factors contributing to demanding schedules, including extravehicular activities and docking operations.

Purpose:

To evaluate the intensity and patterns of work-rest cycles in ISS crewmembers.
To identify key operational factors influencing crew workload.
To assess changes in workload distribution over time.

Summary:

69% of flight weeks were characterized by hard work schedules.
Factors contributing to high workload included EVAs, docking/undocking, joint operations, and mission-specific tasks.
Workload distribution appeared more uniform in 2013-2014 compared to 2010-2012, potentially mitigating critical stress.

Impact:

Findings suggest a potential improvement in workload management on the ISS.
Understanding WRC intensity is crucial for maintaining crew health and performance during long-duration spaceflight.
This analysis provides insights for optimizing future space mission planning and crew support.