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Effects of priming exercise on VO2 kinetics and the power-duration relationship.

Burnley, Mark, Davison, Glen, Baker, Jonathan Robert (2011) Effects of priming exercise on VO2 kinetics and the power-duration relationship. Medicine and science in sports and exercise, 43 (11). pp. 2171-9. ISSN 1530-0315. (doi:10.1249/MSS.0b013e31821ff26d) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:43972)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1249/MSS.0b013e31821ff26d

Abstract

PURPOSE

This study aimed to investigate the influence of prior heavy- and severe-intensity exercise on the oxygen uptake (V·O?) kinetics and the power-duration relationship.

METHODS

Ten cyclists performed 13 exercise tests during a 4-wk period, consisting of a ramp test to determine the gas exchange threshold (GET) and the peak V·O?, followed by a series of square-wave tests to exhaustion under three conditions: no prior exercise (control), prior heavy exercise (6 min at a work rate above GET but below critical power [CP)], and prior severe exercise (6 min at a work rate above the CP). Pulmonary gas exchange was measured throughout the exhaustive exercise bouts and the parameters of the power-duration relationship (CP and the curvature constant, W') were determined from the linear work-time model.

RESULTS

Prior heavy exercise increased the amplitude of the primary V·O? response (by ? 0.19 ± 0.28 L·min(-1), P = 0.001), reduced the V·O? slow component trajectory (by 0.04 ± 0.09 L·min(-2), P = 0.002), and increased the time to exhaustion (by ? 52 ± 92 s, P = 0.005). The CP was unchanged (control vs prior heavy: 284 ± 47 vs 283 ± 44 W; 95% confidence interval, -7 to 5 W), whereas the W' was increased by heavy-intensity priming (16.0 ± 4.8 vs 18.7 ± 4.8 kJ; 95% confidence interval, 0.3-5.2 kJ). Severe-intensity exercise had a similar effect on the V·O? kinetics but had no effect on the time to exhaustion, the CP (275 ± 45 W), or the W' (16.7 ± 4.7 kJ).

CONCLUSIONS

Prior heavy-intensity exercise primes the V·O? kinetics and increases the amount of work that can be performed above the CP.

Item Type: Article
DOI/Identification number: 10.1249/MSS.0b013e31821ff26d
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > School of Sport and Exercise Sciences
Depositing User: Glen Davison
Date Deposited: 01 Nov 2014 22:57 UTC
Last Modified: 16 Feb 2021 12:56 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/43972 (The current URI for this page, for reference purposes)
Davison, Glen: https://orcid.org/0000-0003-4340-0074
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