The effect and complexity of various pacing strategies on the energy expenditure during a 20km cycling time trial

Chuckravanen, Dineshen, Thomas, Kevin, Stone, Mark, St Clair Gibson, Alan, Ansley, Les and Thompson, Kevin (2009) The effect and complexity of various pacing strategies on the energy expenditure during a 20km cycling time trial. In: International Sports Science and Sports Medicine Conference, 20 - 22 August 2009, Newcastle-upon-Tyne.

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Abstract

Pacing strategy is important in athletic competition so that the available metabolic resources are used effectively to complete a physical activity in the minimum time possible1. According to the Central Governor Model2, 3 (CGM), there is a central regulator that paces the peripheral systems during an exercise task to reach the endpoint of that activity without homeostasis failure4, 5. In this study, the energy expenditure through aerobic and anaerobic metabolisms is investigated for various pacing strategies that are self-paced, even-paced and variable-paced for a 20 km cycling time trial. Fractal analysis using the Higuchi algorithm is applied to the power outputs to determine the fractal dimension (FD) or complexity of these pacing strategies. There is no significant difference in the gross mechanical efficiency of mean (±SD) of 18.1±1% in between the pacing strategies for all cyclists. The total amounts of work done by all the cyclists for self-paced, even- paced and variable-paced strategies are 5.14 MJ, 5.15 MJ and 5.13 MJ, respectively, and the means of the fractal dimensions for these pacing strategies are 1.33±0.03, 1.0 and 1.38±0.01 respectively. It is found that there is a significant difference (p<0.01) between the aerobic powers and the anaerobic powers derived from the various pacing strategies. Moreover, blood lactate concentration is highest in variable paced with 5.8±1.7 mmol l?1 followed by self paced with 5.0±1.7 mmol l?1 and least in even paced strategy of 4.1±1.3 mmol l?1, and the mean ratings of perceived exertion (RPE) for self-paced, even-paced and variable-paced are 15.4±1.3, 13.9±1.1 and 15.2±1.2 respectively. As the mean of the fractal dimension of the power outputs of the cyclists for the various pacing strategies increases, there is a corresponding increase in blood lactate concentration. RPE values were higher for self-paced and variable-paced than for the even paced strategy.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	C600 Sports Science
Department:	Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User:	EPrint Services
Date Deposited:	23 Jul 2010 10:35
Last Modified:	31 Jul 2021 08:38
URI:	http://nrl.northumbria.ac.uk/id/eprint/221

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