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Int J Sports Med 2013; 34(12): 1058-1062
DOI: 10.1055/s-0033-1341436
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Analysis of Square-wave Bouts to Verify VO2max

D. Sedgeman
1   Department of Human Performance, Minnesota State University, Mankato, United States
,
L. Dalleck
2   Human Performance, Minnesota State University, Mankato, United States
,
I. E. Clark
3   Viola Holbrook Human Performance Research Laboratory, Minnesota State University, Mankato, United States
,
N. Jamnick
3   Viola Holbrook Human Performance Research Laboratory, Minnesota State University, Mankato, United States
,
R. W. Pettitt
4   Kinesiology, California State University, Fresno, United States
› Author Affiliations
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Publication History



accepted after revision 24 February 2013

Publication Date:
05 June 2013 (online)

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Abstract

Submaximal and supramaximal square-wave bouts have been reported to consistently verify ‘true’ VO2max. Although a direct comparison between both protocols exists, knowledge on the statistical consistency between the protocols using the same group of participants is lacking. The purpose of this study was to conduct an analysis of the submaximal and supramaximal verification bout performed shortly subsequent to a graded exercise test (GXT). On 2 separate occasions, 6 males and 7 females (age: 29±9 years) completed a GXT protocol and an exhaustive, square-wave bout at either end-GXT power minus 2-stages or 105% end-GXT power. No differences (p>0.05) in VO2max were observed between the GXT and square-wave bouts. The typical error (ml/kg/min) for submaximal (1.09) and supramaximal (1.04) trials was similar. Likewise, similar relative measures of consistency were observed for the submaximal (ICC α=0.97, CV=2.4%) and supramaximal trials (ICC α=0.95, CV=2.3%). For a GXT lasting ~10–12 min, the submaximal or supramaximal protocols appear to be equally effective.

Key words

gas exchange threshold - graded exercise test - extreme domain - constant load exercise - VO2max - verification bout
 

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