Related Experiment Videos
[Protein turnover during and after extended space flight]
Aviakosmicheskaia I Ekologicheskaia Meditsina = Aerospace and Environmental Medicine
|August 19, 2000
Summary
Spaceflight significantly reduces protein synthesis by 46%, impacting astronaut health. Maintaining energy balance through diet is crucial for long-duration space missions to mitigate these effects.
Area of Science:
- Space physiology
- Biochemistry
- Astronaut health
Background:
- Understanding protein turnover is vital for astronaut health during prolonged space missions.
- Previous estimations of protein synthesis reduction during spaceflight were based on bed-rest studies, potentially underestimating the impact.
Purpose of the Study:
- To investigate the effects of long-duration spaceflight on protein turnover in astronauts.
- To compare spaceflight-induced changes in protein synthesis with those observed in bed-rested individuals.
Main Methods:
- Utilized a 15N-glycine tracer technique to measure protein synthesis rates.
- Studied four Russian cosmonauts and two U.S. astronauts aboard the Russian orbital station MIR.
Main Results:
- Protein synthesis decreased by an average of 46% during spaceflight.
- This reduction significantly exceeded estimates derived from bed-rest studies.
- Observed a negative energy balance associated with reduced protein synthesis.
Conclusions:
- Long-duration spaceflight markedly impairs protein synthesis, more than previously thought.
- A negative energy balance during spaceflight is linked to reduced protein synthesis.
- Ensuring a balance between energy intake and expenditure is critical for cosmonauts on extended missions.