Influence of temperature and protocol on the calibration of the Computrainer electronically-braked cycling ergometer

Davison, R. C. R., Corbett, Jo and Ansley, Les (2009) Influence of temperature and protocol on the calibration of the Computrainer electronically-braked cycling ergometer. International Sportmed Journal, 10 (2). pp. 66-77. ISSN 1528-3356

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Abstract

Background
The RacerMate Inc. CompuTrainer is an increasingly popular ergometer in Sport Science laboratories, yet there is little information on the characteristics and validity of the CompuTrainer calibration procedure.

Aim
To investigate the effect of a range of environmental temperatures on the CompuTrainer calibration procedure and validate the power output against an SRM powermeter.

Methods
A bicycle fitted with an SRM Training System was attached to a CompuTrainer ergometer. The calibration procedure was repeated (up to 5 occasions) interspaced with 2min cycling at 200W and ~90rpm. The cyclist then cycled for a further 2min at 200W for a direct comparison with the SRM training system. This process was repeated at seven different random calibration values at a range of environmental temperatures (15, 20, 28 and 38oC).

Results
At all temperatures there was a large decline in calibration pressure after the first 2min of cycling, with no further decline after 6min of cycling. This decline was inversely correlated with the temperature (r<sup>2</sup> = 0.7). In low temperatures (15º and 20oC) the CompuTrainer significantly underestimated SRM power by 7.3 ± 5.8 W (95%CI: 4.2-10.4W; Range 1-18W; p = 0.0002) but was similar (-0.3 ± 4.4W) in high temperatures (28° and 38oC) (95%CI: -2.7-2.0W; Range -9-5W; p = 0.78).

Conclusions
Both temperature and calibration procedure were shown to affect power measurement and thus these authors have suggested an alternative procedure to enhance the reliability and validity of the CompuTrainer ergometer.

Item Type: Article
Uncontrolled Keywords: comparison, cycling,SRM.
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > School of Life Sciences > Sport, Exercise and Rehabilitation
Related URLs:
Depositing User: EPrints Services
Date Deposited: 25 Mar 2010 09:42
Last Modified: 10 Aug 2015 11:44
URI: http://nrl.northumbria.ac.uk/id/eprint/438

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