The purpose of this study was to assess the validity and reliability of the Wattbike
cycle ergometer against the SRM Powermeter using a dynamic calibration rig (CALRIG)
and trained and untrained human participants. Using the CALRIG power outputs of 50–1 250 W
were assessed at cadences of 70 and 90 rev.min−1. Validity and reliability data were also obtained from 3 repeated trials in both
trained and untrained populations. 4 work rates were used during each trial ranging
from 50–300 W. CALRIG data demonstrated significant differences (P<0.05) between SRM and Wattbike across the work rates at both cadences. Significant
differences existed in recorded power outputs from the SRM and Wattbike during steady
state trials (power outputs 50–300 W) in both human populations (156±72 W vs. 153±64 W
for SRM and Wattbike respectively; P<0.05). The reliability (CV) of the Wattbike in the untrained population was 6.7%
(95%CI 4.8–13.2%) compared to 2.2% with the SRM (95%CI 1.5–4.1%). In the trained population
the Wattbike CV was 2.6% (95%CI 1.8–5.1%) compared to 1.1% with the SRM (95%CI 0.7–2.0%).
These results suggest that when compared to the SRM, the Wattbike has acceptable accuracy.
Reliability data suggest coaches and cyclists may need to use some caution when using
the Wattbike at low power outputs in a test-retest setting.
cycling - ergometry - calibration - power output - testing - talent identification
