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Upright exercise or supine lower body negative pressure exercise maintains exercise responses after bed restAdaptation to bed rest or space flight is accompanied by an impaired ability to exercise in an upright position. We hypothesized that a daily, 30-min bout of intense, interval exercise in upright posture or supine against lower body negative pressure (LBNP) would maintain upright exercise heart rate and respiratory responses after bed rest. Twenty-four men (31 +/- 3 yr) underwent 5 d of 6 degree head-down tilt: eight performed no exercise (CON), eight performed upright treadmill exercise (UPex), and eight performed supine treadmill exercise against LBNP at -51.3 +/- 0.4 mm Hg (LBNPex). Submaximal treadmill exercise responses (56, 74, and 85% of VO2peak) were measured pre- and post-bed rest. In CON, submaximal heart rate, respiratory exchange ratio, and ventilation were significantly greater (P < or = 0.05) after bed rest. In UPex and LBNPex, submaximal exercise responses were similar pre- and post-bed rest. Our results indicate that a daily 30-min bout of intense, interval upright exercise training or supine exercise training against LBNP is sufficient to maintain upright exercise responses after 5 d of bed rest. These results may have important implications for the development of exercise countermeasures during space flight.
Document ID
20040172938
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lee, S. M.
(Inc. Houston, TX, United States)
Bennett, B. S.
Hargens, A. R.
Watenpaugh, D. E.
Ballard, R. E.
Murthy, G.
Ford, S. R.
Fortney, S. M.
Date Acquired
August 22, 2013
Publication Date
July 1, 1997
Publication Information
Publication: Medicine and science in sports and exercise
Volume: 29
Issue: 7
ISSN: 0195-9131
Subject Category
Aerospace Medicine
Funding Number(s)
CONTRACT_GRANT: M01 RR00073
Distribution Limits
Public
Copyright
Other
Keywords
NASA Center ARC
NASA Discipline Cardiopulmonary
NASA Center JSC

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