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Title: The measurement of maximal power output during short-term cycle ergometry
Authors: Coleman, Simon G.S.
Issue Date: 1994
Publisher: © S.G.S. Coleman
Abstract: One of the most popular methods of assessment of power output during short-term maximal of exercise is the Wingate Anaerobic Test (WAnT), but this test suffers from serious conceptual limitations. Therefore, the first aim of this study was to investigate the theoretical underpinnings and practical implementation of correct power measurement in the WAnT. The second aim was to design and construct a pair of force pedals, and the last objective was to use these pedals to analyse the force application and power output of elite sprint cyclists during maximal ergometry. The inertial and frictional characteristics of Monark ergometer flywheels were assessed using 'run-down' techniques. Moments of Inertia of 0.411 (±0.001) and 0.396 (±0.002) kg.m. 2 were found for the two Monark 864 ergometers measured, with the newer 814 ergometer possessing a value of 0.962 (±0.003) kg.m. 2 . Frictional torques of 0.0025 (±0.0030) to 0.1720 (±0.00 16) N.m. were found, depending on the attachments to the flywheel and chainset. These values were then utilised to correct the power outputs obtained during the WAnT. Corrected powers were found to produce significantly (P<0.001) larger peak and mean power outputs than those obtained using uncorrected methods. The methods used also produced significantly different (P<0.01) corrected power outputs to those of Lakomy (1986), who utilised an incorrect method of'acceleration-correction'. The force pedals were found to be highly linear in calibration and force measurement, as well as suitable for ergometer cycling. These were then used to test elite sprint cyclists on a modified Monark ergometer. The results of the sprint testing of cyclists found no overall significant difference between power measured indirectly (at the flywheel) and that measured at the pedals. There were significant differences between flywheel and pedal power outputs at high pedal velocity, and this was attributed to large crank torques, in agreement with Sjøgaard (1978). Also noted were differences in force application patterns between cyclists, indicating the use of a variety of pedalling techniques. It was concluded that inertial correction of the WAnT is mandatory for the accurate measurement of power output, and that this needs to be based on sound mechanical principles. This study has also shown that is possible to measure power accurately using indirect methods. However, if the individual techniques of elite sprint cyclists are to be examined in detail, it is necessary to utilise force pedals.
Description: Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.
URI: https://dspace.lboro.ac.uk/2134/7146
Appears in Collections:PhD Theses (Sport, Exercise and Health Sciences)

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