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Effect of stroke rate on the distribution of net mechanical power in rowing

Effect of stroke rate on the distribution of net mechanical power in rowing Abstract The aim of this study was to assess the effect of manipulating stroke rate on the distribution of mechanical power in rowing. Two causes of inefficient mechanical energy expenditure were identified in rowing. The ratio between power not lost at the blades and generated mechanical power ( ) and the ratio between power not lost to velocity fluctuations and were used to quantify efficiency (e propelling and e velocity respectively). Subsequently, the fraction of that contributes to the average velocity ( ) was calculated (e net). For nine participants, stroke rate was manipulated between 20 and 36 strokes per minute to examine the effect on the power flow. The data were analysed using a repeated-measures analysis of variance. Results indicated that at higher stroke rates, , , e propelling, and e net increase, whereas e velocity decreases (P < 0.0001). The decrease in e velocity can be explained by a larger impulse exchange between rower and boat. The increase in e propelling can be explained because the work at the blades decreases, which in turn can be explained by a change in blade kinematics. The increase in e net results because the increase in e propelling is higher than the decrease in e velocity. Our results show that the power equation is an adequate conceptual model with which to analyse rowing performance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Sports Sciences Taylor & Francis

Effect of stroke rate on the distribution of net mechanical power in rowing

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Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1466-447X
eISSN
0264-0414
DOI
10.1080/02640410600718046
pmid
17365527
Publisher site
See Article on Publisher Site

Abstract

Abstract The aim of this study was to assess the effect of manipulating stroke rate on the distribution of mechanical power in rowing. Two causes of inefficient mechanical energy expenditure were identified in rowing. The ratio between power not lost at the blades and generated mechanical power ( ) and the ratio between power not lost to velocity fluctuations and were used to quantify efficiency (e propelling and e velocity respectively). Subsequently, the fraction of that contributes to the average velocity ( ) was calculated (e net). For nine participants, stroke rate was manipulated between 20 and 36 strokes per minute to examine the effect on the power flow. The data were analysed using a repeated-measures analysis of variance. Results indicated that at higher stroke rates, , , e propelling, and e net increase, whereas e velocity decreases (P < 0.0001). The decrease in e velocity can be explained by a larger impulse exchange between rower and boat. The increase in e propelling can be explained because the work at the blades decreases, which in turn can be explained by a change in blade kinematics. The increase in e net results because the increase in e propelling is higher than the decrease in e velocity. Our results show that the power equation is an adequate conceptual model with which to analyse rowing performance.

Journal

Journal of Sports Sciences – Taylor & Francis

Published: Feb 15, 2007

Keywords: Efficiency; mechanics; power distribution; rowing

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