Effects of magnitude and frequency of variations in external power output on simulated cycling time-trial performance

Wells, Marc and Atkinson, Greg and Marwood, Simon (2013) Effects of magnitude and frequency of variations in external power output on simulated cycling time-trial performance. Journal of Sports Sciences, 31. pp. 1639-1646. ISSN 0264-0414

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Mechanical models of cycling time-trial performance have indicated adverse effects of variations in external power output on overall performance times. Nevertheless, the precise influences of the magnitude and number of these variations over different distances of time trial are unclear. A hypothetical cyclist (body mass 70 kg, bicycle mass 10 kg) was studied using a mathematical model of cycling, which included the effects of acceleration. Performance times were modelled over distances of 4-40 km, mean power outputs of 200-600 W, power variation amplitudes of 5-15% and variation frequencies of 2-32 per time-trial. Effects of a "fast-start" strategy were compared with those of a constant-power strategy. Varying power improved 4-km performance at all power outputs, with the greatest improvement being 0.90 s for ± 15% power variation. For distances of 16.1, 20 and 40 km, varying power by ± 15% increased times by 3.29, 4.46 and 10.43 s respectively, suggesting that in long-duration cycling in constant environmental conditions, cyclists should strive to reduce power variation to maximise performance. The novel finding of the present study is that these effects are augmented with increasing event distance, amplitude and period of variation. These two latter factors reflect a poor adherence to a constant speed.

Item Type: Article
Additional Information and Comments: This is an Author's Original Manuscript of an article whose final and definitive form, the Version of Record, has been published in Journal of Sports Sciences, (2013), [copyright Taylor & Francis], available online at http://www.tandfonline.com/10.1080/02640414.2013.794299
Keywords: "mathematical model, pacing strategy, variable, constant, cycling speed "
Faculty / Department: Faculty of Science > School of Health Sciences
Depositing User: Karen Foxton
Date Deposited: 22 Mar 2016 09:44
Last Modified: 01 Apr 2016 12:25
URI: https://hira.hope.ac.uk/id/eprint/917

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