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Knee-Joint Proprioception During 30-Day 6 deg Head-Down Bed Rest with Isotonic and Isokinetic Exercise TrainingTo determine if daily isotonic exercise or isokinetic exercise training coupled with daily log proprioceptive training, would influence log proprioceptive tracking responses during Bed Rest (BR), 19 men (36 +/- SD 4 years, 178 +/- 7 cm, 76.8 +/- 7.8 kg) were allocated into a NO-Exercise (NOE) training control group (n = 5), and IsoTanic Exercise (ITE, n = 7) and IsoKinetic Exercise (IKE, n = 7) training groups. Exercise training was conducted during BR for two 30-min period / d, 5 d /week. Only the IKE group performed proprioceptive training using a now isokinetic procedure with each lower extremity for 2.5 min before and after the daily exercise training sessions; proprioceptive testing occurred weekly for all groups. There were no significant differences in proprioceptive tracking scores, expressed as a percentage of the perfect score of 100, in the pro-BR ambulatory control period between the three groups. Knee extension and flexion tracking responses were unchanged with NOE during BR, but were significantly greater (*p less than 0.05) at the end of BR in both exercise groups when compared with NOE responses (extension: NOE 80.7 +/- 0.7%, ITE 82.9 +/- 0.6%, IKE 86.5* +/- 0.7%; flexion: NOE 77.6 +/- 1.50, ITE 80.0 +/- 0.8% (NS), IKE 83.6* +/- 0.8%). Although proprioceptive tracking was unchanged during BR with NOE, both lsotonic exercise training (without additional propriaceptive training) and especially isokinetic exercise training when combined with daily proprioceptive training, significantly improved knee proprioceptive tracking responses after 30 d of BR.
Document ID
Document Type
Reprint (Version printed in journal)
Bernauer, E. M. (NASA Ames Research Center Moffett Field, CA United States)
Walby, W. F. (NASA Ames Research Center Moffett Field, CA United States)
Ertl, A. C. (California Univ. Davis, CA United States)
Dempster, P. T. (Loredan Biomedical, Inc. Davis, CA United States)
Bond, M. (Loredan Biomedical, Inc. Davis, CA United States)
Greenleaf, J. E. (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Subject Category
Aerospace Medicine
Report/Patent Number
NAS 1.26:203339
Funding Number(s)
PROJECT: DA Proj. 3A1-61101-A-91-C
PROJECT: RTOP 199-22-32
PROJECT: RTOP 199-21-12
PROJECT: RTOP 199-22-12
PROJECT: RTOP 199-22-22
PROJECT: RTOP 199-22-44
Distribution Limits
Public Use Permitted.
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