Space Travelers Will Need High-Intensity Exercise To Protect Heart Health From Long-Term Effects of Weightlessness – SciTechDaily

• Sustained low-intensity exercise does not completely counteract the effects of weightlessness on the heart muscle, which will atrophy over time in a gravity-free environment.
• Short bursts of repeated high-intensity activity during shorter space missions may be more successful in keeping the heart healthy.

As NASA seeks to build a lunar outpost, visit Mars and commercialize spaceflight, the long-term effects of weightlessness on the human heart are of critical importance, according to researchers….

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