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Cardiopulmonary Responses to Supine Cycling during Short-Arm CentrifugationThe purpose of this study was to investigate cardiopulmonary responses to supine cycling with concomitant +G(sub z) acceleration using the NASA/Ames Human Powered Short-Arm Centrifuge (HPC). Subjects were eight consenting males (32+/-5 yrs, 178+/-5 cm, 86.1+/- 6.2 kg). All subjects completed two maximal exercise tests on the HPC (with and without acceleration) within a three-day period. A two tailed t-test with statistical significance set at p less than or equal to 0.05 was used to compare treatments. Peak acceleration was 3.4+/-0.1 G(sub z), (head to foot acceleration). Peak oxygen uptake (VO2(sub peak) was not different between treatment groups (3.1+/-0.1 Lmin(exp -1) vs. 3.2+/-0.1 Lmin(exp -1) for stationary and acceleration trials, respectively). Peak HR and pulmonary minute ventilation (V(sub E(sub BTPS))) were significantly elevated (p less than or equal to 0.05) for the acceleration trial (182+/-3 BPM (Beats per Minute); 132.0+/-9.0 Lmin(exp -1)) when compared to the stationary trial (175+/-3 BPM; 115.5+/-8.5 Lmin(exp -1)). Ventilatory threshold expressed as a percent of VO2(sub peak) was not different for acceleration and stationary trials (72+/-2% vs. 68+/-2% respectively). Results suggest that 3.4 G(sub z) acceleration does not alter VO2(sub peak) response to supine cycling. However, peak HR and V(sub E(sub BTPS)) response may be increased while ventilatory threshold response expressed as a function of percent VO2(sub peak) is relatively unaffected. Thus, traditional exercise prescription based on VO2 response would be appropriate for this mode of exercise. Prescriptions based on HR response may require modification.
Document ID
20020068899
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Vener, J. M.
(Utah Univ. Salt Lake City, UT United States)
Simonson, S. R.
(NASA Ames Research Center Moffett Field, CA United States)
Stocks, J.
(NASA Ames Research Center Moffett Field, CA United States)
Evettes, S.
(NASA Ames Research Center Moffett Field, CA United States)
Bailey, K.
(NASA Ames Research Center Moffett Field, CA United States)
Biagini, H.
(NASA Ames Research Center Moffett Field, CA United States)
Jackson, C. G. R.
(California State Univ. Fresno, CA United States)
Greenleaf, J. E.
(NASA Ames Research Center Moffett Field, CA United States)
Dalton, Bonnie P.
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Aerospace Medicine
Meeting Information
Meeting: Southwest Chapter Meeting, American College of Sports Medicine
Location: Salt Lake City, UT
Country: United States
Start Date: November 16, 2001
End Date: November 17, 2001
Funding Number(s)
PROJECT: RTOP 111-10-20
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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