Int J Sports Med 2007; 28(6): 525-530
DOI: 10.1055/s-2006-955888
Training & Testing

© Georg Thieme Verlag KG Stuttgart · New York

Power Output Measurement during Treadmill Cycling

D. A. Coleman1 , J. D. Wiles1 , R. C. R. Davison2 , M. F. Smith3 , I. L. Swaine1
  • 1Department of Sport Science, Tourism and Leisure, Canterbury Christ Church University, Canterbury, United Kingdom
  • 2Department of Sport and Exercise Science, University of Portsmouth, Portsmouth, United Kingdom
  • 3School of Sport and Leisure, University of Lincoln, Lincoln, United Kingdom
Further Information

Publication History

accepted after revision September 27, 2006

Publication Date:
11 May 2007 (online)


The study aim was to consider the use of a motorised treadmill as a cycling ergometry system by assessing predicted and recorded power output values during treadmill cycling. Fourteen male cyclists completed repeated cycling trials on a motorised treadmill whilst riding their own bicycle fitted with a mobile ergometer. The speed, gradient and loading via an external pulley system were recorded during 20-s constant speed trials and used to estimate power output with an assumption about the contribution of rolling resistance. These values were then compared with mobile ergometer measurements. To assess the reliability of measured power output values, four repeated trials were conducted on each cyclist. During level cycling, the recorded power output was 257.2 ± 99.3 W compared to the predicted power output of 258.2 ± 99.9 W (p > 0.05). For graded cycling, there was no significant difference between measured and predicted power output, 268.8 ± 109.8 W vs. 270.1 ± 111.7 W, p > 0.05, SEE 1.2 %. The coefficient of variation for mobile ergometer power output measurements during repeated trials ranged from 1.5 % (95 % CI 1.2 - 2.0 %) to 1.8 % (95 % CI 1.5 - 2.4 %). These results indicate that treadmill cycling can be used as an ergometry system to assess power output in cyclists with acceptable accuracy.


Damian A. Coleman

Department of Sport Science
Tourism and Leisure
Canterbury Christ Church University




United Kingdom

Phone: + 44 12 27 78 26 39

Fax: + 44 12 27 47 04 42

Email: [email protected]