[abstract] OXYGEN UPTAKE AND HEART RATE RELATIONSHIP IN DUAL-CYCLE MAXIMAL EXERCISE.

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[abstract] OXYGEN UPTAKE AND HEART RATE RELATIONSHIP IN DUAL-CYCLE MAXIMAL EXERCISE.

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Title: [abstract] OXYGEN UPTAKE AND HEART RATE RELATIONSHIP IN DUAL-CYCLE MAXIMAL EXERCISE.
Author: Foster, PP; Feiveson, AH; Genhardt, ML; Schneider, SM
Abstract: INTRODUCTION. Aerobic prebreathe exercise on a dual cycle ergometer has been shown to dramatically reduce the incidence of decompression illness (DCI) at altitude. For this whole-body exercise, we determined the relationship between heart rate (HR) and oxygen consumption (VO2) during a graded maximal exercise protocol. METHODS. The study involved II healthy women and men subjects who passed USAF Class III Physical examinations and were representative of the astronaut population in age and body mass index. Two series of progressive incremental (2.5 min steps) maximal tests were performed using an electronically controlled and load-stabilized ergometer with subjects in the seated position: for leg and arm ergometry and leg ergometry only. Leg and arm exercise represented respectively 88 percent and 1.2 percent of the total workload. Measurements of VO2, HR, ECG, VCO2 / VO2, V[{sub}E] , V[{sub}T], and rate of perceived exertion (Borg scale) were taken during the final 30 s of each level during the graded VO2peak test. See figure on page 16. RESULTS. With dual-cycle ergometry, we found a nonlinear relationship between VO2 and HR averaged over the subjects. The relationship was VO2 (L/min) equal to .51 + 0.019 x e^(0.028xHR). (R^2 equal to 0.96). In contrast, with leg-only ergometry, the relationship was linear. However, the maximal HR and VO2max were not significantly different in both tests. CONCLUSIONS. We observed a nonlinear relationship between VO2 and HR in the whole-body exercise whereas it was linear for leg-only exercise.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/5351
Date: 2000

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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