<ul><li>Exposure to microgravity causes a decline in muscle size, strength, and endurance.</li><li>Astronauts on the International Space Station (ISS) have minimal losses in muscle size, strength, and endurance if they adhere to the exercise schedule.</li><li>New exploration countermeasure systems may not be able to support exercise as required to maintain human performance.</li><li>NASA is conducting research to mitigate the risk of reduced physical performance capabilities due to reduced muscle size, strength, and endurance.</li></ul>

Risk of Reduced Physical Performance Capabilities Due to Reduced Muscle Size, Strength, and Endurance (Muscle Risk)

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