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    Area of Science:

    • Space exploration
    • Human physiology
    • Exercise science

    Background:

    • Sedentary lifestyles and lack of physical activity are major global health risks.
    • Studying the effects of reduced physical activity is challenging due to difficulties in standardizing conditions.
    • Simulated space missions offer unique environments to study human adaptation and countermeasures.

    Purpose of the Study:

    • To investigate the effectiveness of a combined exercise regimen in preventing physical deconditioning during long-term isolation.
    • To assess physical performance stability in subjects undergoing a simulated space mission.
    • To evaluate the impact of training interruptions on physical performance maintenance.

    Main Methods:

    • Six male subjects from diverse nationalities participated in the 520-day Mars-500 simulated space mission.
    • A structured exercise program incorporating resistive and cyclic training was implemented, with two planned breaks.
    • Physical performance was assessed using incremental loading tests, maximal voluntary effort tests, and bicycle ergometry (PWC-170).

    Main Results:

    • Subjects' physical performance levels remained at or above their initial baseline values throughout the isolation period.
    • The implemented training system successfully counteracted the negative effects of reduced physical activity.
    • Despite two pauses in the training, physical performance did not degrade below baseline.

    Conclusions:

    • A comprehensive exercise program, including resistive and cyclic activities, is effective in maintaining physical performance during prolonged isolation.
    • The findings support the development of exercise countermeasures for long-duration space missions and terrestrial sedentary scenarios.
    • Stability or improvement in physical performance was achieved, highlighting the efficacy of the intervention.