Jumping workouts could help astronauts prevent the type of cartilage damage they are likely to endure during lengthy missions to Mars and the Moon, a new study suggests. The researchers found that mice in a nine-week program of reduced movement experienced cartilage thinning and cellular clustering, both early indicators of arthritis. But mice that performed jump training three times a week showed the opposite effect -- thicker, healthier cartilage with normal cellular structure.
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