Journal of Applied Physiology
Vol 90 #1 January, 2001
Effects of long-term space flight on mechanical properties of muscles in humans
By Daniel Lambertz, Chantal Perot, Rustem Kaspranski, and Francis Goubel
This study looked at the effects of long-term spaceflight on muscles in humans. Different muscle actions were measured before and two-three days after spaceflight.
Results from the study found that there was an increase in musculotendinous stiffness as a result of eccentric exercises that were performed aboard the Mir station. The stiffness was likely an adaptive response to both microgravity and exercise. This is possible brought about by a lack of gravity
There was also a decrease in musculoarticular stiffness as a result of passive motion during periods of immobilization. This is known to limit the increase in joint stiffness. Other findings from this report include an increase in the maximal force production and a decrease in shortening velocity.
The researchers concluded that those in space have to practice physical exercise on board to maintain muscle strength that they have on Earth. Physical activity in a space station should include an appropriate combination of exercise modes that will counteract neuromuscular perturbations.
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