Document Detail

VO2max May Not Be Reached During Exercise to Exhaustion above Critical Power.
MedLine Citation:
PMID:  22330019     Owner:  NLM     Status:  Publisher    
PURPOSE: This study was designed to determine whether VO2 reaches a maximum, equivalent to that attained in an incremental exercise test to exhaustion, during "submaximal" fatigue-inducing constant-power exercise bouts above Critical Power (CP). METHODS: Nine males (age: 24.6 ± 3.6 yr.; ht: 182.8 ± 6.9 cm; wt: 77.8 ± 12.1 kg) and 4 females (age: 29.0 ± 7.3 yr.; ht: 170.8 ± 3.2 cm; wt: 61.8 ± 8.2 kg) underwent an incremental VO2max test (IET) on a cycle ergometer, followed by 4 or 5 randomly assigned, constant-power exercise bouts to exhaustion, on separate days. Critical power for each subject was estimated using linear and nonlinear regression. RESULTS: IET VO2max averaged 3.55 ± 0.92 l/min (Respiratory exchange ratio = 1.21 ± 0.05; heart rate = 186 ± 10 bpm; 96.1 ± 6.3% age-predicted max). Mean peak VO2 (range 3.32 ± 0.88 to 3.54 ± 0.91 l/min) during the 3 highest constant-power bouts (two of which were 53 to 82 W less than peak power output attained during IET) was not significantly different than IET VO2max. Eleven of 13 subjects exceeded their IET VO2max during at least one of the constant-power exercise bouts. However, peak VO2 (3.11 ± 0.79 l/min) during the lowest constant-power exercise bout, which ranged from 10 W to 36 W above CP estimated with a 2-parameter nonlinear model, was significantly lower than IET VO2max (88.2 ± 9.4% of IET VO2max). CONCLUSIONS: At power outputs above CP, VO2 does not necessarily increase to maximum during constant-power exercise to exhaustion. Additionally, the highest VO2 values measured during a traditional VO2 "max" test (i.e., IET) may not reflect the highest attainable VO2 despite VO2max criteria being met.
Brandon J Sawyer; R Hugh Morton; Christopher J Womack; Glenn A Gaesser
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-9
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Arizona State University, School of Nutrition and Health Promotion, Phoenix, AZ 2Massey University, School of Sport and Exercise, Palmerston North, New Zealand 3James Madison University, Department of Kinesiology, Harrisonburg, VA.
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