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J Sports Sci. 2017 Jul;35(14):1451-1458. doi: 10.1080/02640414.2016.1215495. Epub 2016 Aug 23.

The validity and reliability of a sample of 10 Wattbike cycle ergometers.

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a School of Sport , Leeds Beckett University , Leeds , UK.
b School of Social and Health Sciences , Leeds Trinity University , Leeds , UK.


The purpose of the study was to assess the validity and inter-bike reliability of 10 Wattbike cycle ergometers, and to assess the test-retest reliability of one Wattbike. Power outputs from 100 to 1000 W were applied using a motorised calibration rig (LODE) at cadences of 70, 90, 110 and 130 rev · min-1, which created nineteen different intensities for comparison. Significant relationships (P < 0.01, r2 = 0.99) were found between each of the Wattbikes and the LODE. Each Wattbike was found to be valid and reliable and had good inter-bike agreement. Within-bike mean differences ranged from 0.0 W to 8.1 W at 300 W and 3.3 W to 19.3 W at 600 W. When taking into account the manufacturers stated measurement error for the LODE (2%), the mean differences were less than 2%. Comparisons between Wattbikes at each of the nineteen intensities gave differences from 0.6 to 25.5 W at intensities of 152 W and 983 W, respectively. There was no significant difference (P > 0.05) between the measures of power recorded in the test-retest condition. The data suggest that the Wattbike is an accurate and reliable tool for training and performance assessments, with data between Wattbikes being able to be used interchangeably.


Wattbike; cycling; ergometer; reliability; validity

[Indexed for MEDLINE]

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