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Energy expenditure while performing gymnastic-like motion in spacelab during spaceflight: case study
Masahiro Kaneko1, Kazuki Miyatsuji, Satoru Tanabe
1Biomechanics Laboratory, Osaka University of Health and Sport Sciences, Osaka, Japan 590-0496. kaneko@ouhs.ac.jp
Summary
Astronauts can safely perform gymnastic-like exercises in space. This cosmic exercise requires energy expenditure similar to fast walking, making it suitable for maintaining fitness during spaceflight without adverse effects.
Area of Science:
- Space physiology
- Biomechanics
- Exercise science
Background:
- Assessing astronaut energy expenditure is crucial for long-duration space missions.
- Understanding the biomechanics of exercise in microgravity is essential for astronaut health and performance.
Purpose of the Study:
- To estimate the energy cost of a gymnastic-like exercise performed by an astronaut in space (cosmic exercise).
- To compare the mechanical work and energy expenditure of this exercise to terrestrial activities.
Main Methods:
- Measured mechanical work around the center of mass (COM) during spaceflight using video analysis.
- Calculated internal mechanical work (W(int)) against inertia.
- Compared astronaut's exercise to a similar motion performed by a terrestrial control subject.
Main Results:
- Astronaut's total mechanical power was approximately 119 W.
- Control subject had similar total power, but half was external work against gravity.
- Estimated energy expenditure for cosmic exercise was 476 W (7.7 W/kg), comparable to fast walking.
Conclusions:
- The studied cosmic exercise is appropriate and safe for astronauts in space.
- The exercise involves no center of mass shifts or vibratory disturbances.
- This form of exercise can help maintain astronaut fitness during spaceflight.
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