Title

Reliability of physiological attributes and their association with stochastic cycling performance

Document Type

Journal Article

Publisher

Human Kinetics

Faculty

Faculty of Health, Engineering and Science

School

School of Exercise and Health Sciences

RAS ID

18416

Comments

This article was originally published as: Levin G.T., Laursen P.B., Abbiss C.R. (2014). Reliability of physiological attributes and their association with stochastic cycling performance. International Journal of Sports Physiology and Performance, 9(2), 309-315. Original article available here

Abstract

Purpose: To assess the reliability of a 5-min-stage graded exercise test (GXT) and determine the association between physiological attributes and performance over stochastic cycling trials of varying distance. Methods: Twenty-eight well-trained male cyclists performed 2 GXTs and either a 30-km (n = 17) or a 100-km stochastic cycling time trial (n = 9). Stochastic cycling trials included periods of high-intensity efforts for durations of 250 m, 1 km, or 4 km depending on the test being performing. Results: Maximal physiological attributes were found to be extremely reliable (maximal oxygen uptake [VO 2max]: coefficient of variation [CV] 3.0%, intraclass correlation coefficient [ICC] .911; peak power output [PPO]: CV 3.0%, ICC .913), but a greater variability was found in ventilatory thresholds and economy. All physiological variables measured during the GXT, except economy at 200 W, were correlated with 30-km cycling performance. Power output during the 250-m and 1-km efforts of the 30-km trial were correlated with VO2max, PPO, and the power output at the second ventilatory threshold (r = .58-.82). PPO was the only physiological attributed measured during the GXT to be correlated with performance during the 100-km cycling trial (r = .64). Conclusions: Many physiological variables from a reliable GXT were associated with performance over shorter (30-km) but not longer (100-km) stochastic cycling trials.

DOI

10.1123/IJSPP.2013-0048

Access Rights

Not open access

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