Date of Award

Summer 2000

Document Type

Thesis

Degree Name

Master of Science in Education (MSEd)

Department

Human Movement Sciences

Program/Concentration

Physical Education

Committee Director

David P. Swain

Committee Member

J. David Branch

Committee Member

Brian C. Leutholtz

Call Number for Print

Special Collections; LD4331.E44 B46

Abstract

Simple, valid, and accurate means for estimating aerobic capacity from submaximal cycle ergometry are needed for use with the general public. Current popular methods such as the ACSM cycle ergometer protocol have been shown to overestimate maximal oxygen uptake (VO2max) by as much as 26%. In the current study, VO2max was estimated using a new protocol based on a single 6-min stage designed to elicit 70% HRR. The data was also used to estimate VO2max by the Astrand method for comparison. Forty-nine healthy males and females, aged 18-44 yr (X = 26 ± 1) performed a 6-minute submaximal cycling protocol (VO2Reserve method) immediately followed by a maximal test. Heart rate (HR), respiratory exchange ratio (RER), and VO2max were determined. The submaximal test using the VO2Reserve method provided a valid estimate of VO2max (r = 0.91, SEE = 3 .4 mlmin-1.kg-1) when compared to measured VO2max values. Furthermore, no overprediction or underprediction of the mean VO2max was found. A significant number of subjects achieved a ¾HRR that was higher than the recommended 70%. Improved accuracy in the estimation of VO2max was observed at higher intensities of exercise. Individuals exercising at ≤ 70% HRR, > 70 to 79.9% HRR, and ≥ 80% HRR showed a correlation coefficient and SEE of r = 0.85 and SEE= 4.8 mlmin-1.kg-1, r = 0.89 and SEE= 4.2 mlmin-1.kg-1, and r = 0.97 and SEE= 2.1 mlmin-1.kg-1, respectively. The Astrand method of estimation also proved to be valid (r = 0.83, SEE= 5.4 mlmin-1.kg-1), although it was not as accurate as the VO2Reserve method. The VO2Reserve method is valid and accurate as a means of estimating VO2max, with reservations. It is not recommended for use at this time due to the higher than recommended intensity levels achieved by the subjects during the protocol.

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DOI

10.25777/asjw-6e85

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