[Effects of exercise training during 21 d -6 degrees head down bed rest on dynamic posture equilibrium and motor coordination].
OBJECTIVE
To study the effects of 21 d -6 degrees head down bed rest (HDBR) with exercise training on dynamic posture equilibrium and motor coordination.


METHODS
Ten healthy young men were randomly divided into HDBR control groups and HDBR exercise groups, with 5 in each group. The subjects in the exercise group performed exercise with a bicycle ergometer in the supine position 1 h/d during bed rest. Dynamic posture equilibrium as well as isokinetic concentric muscular strength were determined before and after 21 d HD-BR.


RESULTS
After HDBR, average dynamic proprioception score and dynamic motor coordination decreased significantly, relative peak torque (peak torque /body weights PT/BW) also decreased significantly and accompanied with increase of the peak torque ratio between hamstrings and quadriceps (H/Q) in HDBR control groups. Average dynamic proprioception score and dynamic motor coordination in the HDBR exercise groups remained above the HDBR control groups, but the H/Q ratio showed no significant change.


CONCLUSIONS
The results showed that exercise training during 21 d -6 degrees head-down tilt bed-rest do have beneficial effects on retaining the dynamic posture equilibrium and dynamic motor coordination of the subjects after bed rest.
Institute of Space Medico-Engineering, Beijing, China.
Yu-sheng
YS
Liu
Wei-fen
WF
Huang
Xing-hua
XH
Liu
Jun
J
Wang
Dong-ming
DM
Zhao
Xuan
X
Wu
D000293:Adolescent; D000328:Adult; D001510:Bed Rest; D015444:Exercise / Q000502:physiology; D005081:Exercise Therapy; D018475:Head-Down Tilt; D006801:Humans; D008297:Male; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011434:Proprioception / Q000502:physiology; D011597:Psychomotor Performance / Q000502:physiology*; D019415:Torque; D018474:Weightlessness Simulation