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Reliability/validity of the Fortius trainer
Journal article   Peer reviewed

Reliability/validity of the Fortius trainer

J.J. Peiffer and B. Losco
International Journal of Sports Medicine, Vol.32(5), pp.353-356
2011
DOI: https://doi.org/10.1055/s-0031-1271772
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Abstract

This study examined the reliability/validity of power output measured using the Fortius Virtual Reality cycle trainer. 10 cyclists (age: 28 +/- 6 years; (V) over dotO(2)max: 60.9 +/- 7.2 ml . kg(-1) . min(-1); peak power: 393 +/- 82 W) completed three 20 km time trials on a Fortius cycle trainer. During each time trial, power output was measured at 1 Hz using the Fortius internal software and a PowerTap power monitor. Validity calculated for the Fortius trainer; Pearson correlation coefficient (r = 0.99; 95 % CI: 0.98-0.99; p < 0.01) and typical error of estimate (3.5 %; 95 % CI: 3.2-3.9 %), was similar to other established laboratory ergometers. No differences (F-2,F-16 = 0.32; p = 0.73) in mean 20 km power were observed between trial 1 (253 +/- 46 W), 2 (258 +/- 49 W), or 3 (255 +/- 50 W). Test-retest reliability (intraclass correlation coefficient (ICC) and coefficient of variation (CV)) was better between trial 2 and 3 (ICC = 1.00 (CI: 0.98-1.00); CV: 1.6 % (CI: 1.1-3.3 %)) compared with trial 1 and 2 (ICC = 0.98 (CI: 0.91-1.00); CV: 3.3% (CI: 2.2-6.4%)). The Fortius cycle trainer is a valid and reliable device for the measurement of power output in cyclists, thus providing an alternative to larger more expensive laboratory ergometers.

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Citation topics
1 Clinical & Life Sciences
1.172 Sports Science
1.172.648 Exercise Physiology
Web Of Science research areas
Sport Sciences
ESI research areas
Clinical Medicine
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