Int J Sports Med 2014; 35(02): 118-124
DOI: 10.1055/s-0033-1345135
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

The Incidence of V˙O 2 plateau at V˙O 2max in a Cardiac-Diseased Population

P. B. Nolan
1  Department of Sport and Exercise Science, The University of Auckland, New Zealand
,
R. Maddison
2  National Institute for Health Innovation, The University of Auckland, New Zealand
,
L. Dalleck
1  Department of Sport and Exercise Science, The University of Auckland, New Zealand
› Author Affiliations
Further Information

Publication History



accepted after revision 11 March 2013

Publication Date:
14 August 2013 (eFirst)

Abstract

We sought to determine the incidence of V˙O 2 plateau at V˙O 2max in a cardiovascular-diseased (CVD) population using 4 different sampling intervals (15-breath moving average, 15 s, 30 s, and 60 s) and 3 different V˙O 2 plateau criteria (≤50 mL · min−1, ≤80 mL · min−1, and ≤150 mL · min−1). A total of 69 people (62±10 yrs.) with recently diagnosed CVD performed a maximal exercise test (10:07±2:24 min) on a treadmill. The test was classified as maximal (n=57, 2 430±605 mL · min−1) if self-terminated due to fatigue or classified as symptom-limited (n=12, 1 683±438 mL · min−1) if symptoms presented. Chi-square analysis revealed a significant (p<0.05) effect of sampling interval on incidence of V˙O 2 plateau at V˙O 2max across all 3 V˙O 2 plateau criteria. The sampling interval had an increasingly stronger influence on the incidence of V˙O 2 plateau at V˙O 2max with smaller criterion thresholds as evidenced by the Cramer’s V statistics: [≤50 mL · min−1 (Cramer’s V=0.548, p<0.05], ≤80 mL · min−1 [Cramer’s V=0.489, p<0.05], ≤150 mL · min−1 [Cramer’s V=0.214, p<0.05]. Incidence of V˙O2 plateau at V˙O 2max in CVD individuals is significantly influenced by the sampling interval applied. Based on our findings we recommend a15 breath moving average and V˙O 2 plateau criterion of ≤50 mL · min−1.