Abating Heat Accrual During Exercise in Microgravity and Implications for Future Long-Term Missions

Area of Science:

• Space Medicine
• Human Physiology
• Exercise Science

Background:

• Manned Mars missions necessitate smaller spacecraft with limited exercise equipment.
• Microgravity (μG) and exercise both increase body heat, exacerbating heat gain during spaceflight.
• Effective heat management is crucial for long-duration missions due to exercise demands.

Purpose of the Study:

• To review the physiological challenges of thermoregulation during in-flight exercise in microgravity.
• To evaluate current exercise hardware and strategies for mitigating heat accrual.
• To identify potential solutions for managing heat gain on future long-duration space missions.

Main Methods:

• Literature review integrating data on microgravity, thermoregulation, exercise, energy balance, and cardiovascular physiology.
• Analysis of factors impacting heat balance during spaceflight.
• Discussion of strategies to limit heat accrual.

Main Results:

• Existing in-flight exercise protocols and equipment are inadequate for mitigating heat accrual on Mars missions.
• Current solutions do not meet the operational performance needs for astronauts.

Conclusions:

• Future missions should explore high-sodium beverages for fluid balance and palm cooling for heat transfer.
• Plyometric exercise utilizing gravity-independent hardware is recommended.
• Further research is needed to validate these strategies for reducing heat gain in microgravity.