title: Reproducibility of the maximum accumulated oxygen deficit and run time to exhaustion during short-distance running.
abstract: The aim of this study was to determine the reproducibility of the maximal accumulated oxygen deficit and the associated exercise time to exhaustion during short-distance running. Fifteen well-trained males (mean +/- s: VO2max = 58.0+/-4.6 ml x kg(-1) x min(-1)) performed the maximum accumulated oxygen deficit test at an exercise intensity equivalent to 125% VO2max. The test was repeated at the same time of day on three occasions within 3 weeks. There was no significant systematic bias between trials for either maximum accumulated oxygen deficit (man +/- s: trial 1 = 69.0+/-13.1; trial 2 = 71.4+/-12.5; trial 3 = 70.4+/-15.0 ml O2 Eq x kg(-1); ANOVA, F = 0.70, PP= 0.51) or exercise time to exhaustion (trial 1 = 194 + 31.1; trial 2 = 198 + 33.2; trial 3 = 201 + 36.8 s; F= 1.49, P = 0.24). In addition, other traditional measures of reliability were also favourable. These included intraclass correlation coefficients of 0.91 and 0.87, and sample coefficients of variation of 6.8% and 5.0%, for maximum accumulated oxygen deficit and exercise time to exhaustion respectively. However, the '95% limits of agreement' were 0+/-15.1 ml O2 Eq (1.01 multiply/divide 1.26 as a ratio) and 0+/-33.5 s (1.0 multiply/divide 1.18 as a ratio) for maximum accumulated oxygen deficit and exercise time to exhaustion respectively. We estimate that the sample sizes required to detect a 10% change in exercise time to exhaustion and maximum accumulated oxygen deficit after a repeated measures experiment are 10 and 20 respectively. Unlike the results of previous maximum accumulated oxygen deficit studies, we conclude that it is not a reliable measure.
authors.affiliation: Department of Sport and Exercise Sciences, University of Luton, UK. mike.doherty@luton.ac.uk
authors.forename: M
authors.initials: M
authors.lastname: Doherty
authors.forename: P M
authors.initials: PM
authors.lastname: Smith
authors.forename: K
authors.initials: K
authors.lastname: Schroder
mesh_terms: D000328:Adult; D015308:Anaerobic Threshold / Q000502:physiology; D000704:Analysis of Variance; D002245:Carbon Dioxide / Q000032:analysis; D016001:Confidence Intervals; D005080:Exercise Test / Q000592:standards*; D017079:Exercise Tolerance / Q000502:physiology*; D006801:Humans; D008297:Male; D010100:Oxygen / Q000032:analysis; D010101:Oxygen Consumption / Q000502:physiology*; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D018709:Statistics, Nonparametric; D013997:Time Factors
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen