Agnirva Space Premier League - Expedition #32343: Building Stronger Astronauts: How Exercise in Space Keeps the Crew Healthy

When we think about space, we often imagine astronauts floating in zero gravity, marveling at Earth from afar. But living in space isn’t just a vacation—it’s hard work, especially for the human body. One big challenge? Staying fit. Without gravity, muscles and bones can weaken. That’s why the Integrated Resistance and Aerobic Training Study (iRAT) was created—to keep astronauts strong and healthy during long missions.

Led by Dr. Lori Ploutz-Snyder from the University of Michigan and developed by NASA’s Human Research Program, iRAT ran across numerous ISS expeditions. The goal? Test different workout routines that mix resistance (like weightlifting) and aerobic (like running or cycling) exercises to maintain astronauts’ strength, endurance, and overall health in space.

The absence of gravity causes a rapid decline in muscle mass and bone density. To combat this, astronauts used advanced equipment like the Advanced Resistive Exercise Device (ARED), treadmill, and stationary bicycle. The study tracked physical performance, muscle size, and bone strength over time.

Through careful analysis, iRAT provided valuable data showing how astronauts could maintain their fitness levels using a blend of exercises. This wasn’t just good news for astronauts—it also has big implications for elderly care and rehabilitation on Earth, where muscle loss can be a serious problem.

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