Resumen:
Objectives
To assess the reliability, validity, and sensitivity of a novel device (Notio Konect™) which is purported to provide a real-time analysis of aerodynamic drag area (CdA) during cycling.
Design
Observational, cross-sectional study.
Methods
Fifteen trained cyclists rode in an indoor velodrome using three different positions (upright, aero [holding aero bars], and optimized aero [similar to aero, but wearing a time-trial helmet]). They completed six 1-min trials in each position. The CdA was measured with Notio and with two other systems (Track Aero System™ [TAS] and a validated mathematical model).
Results
The CdA measured with Notio showed good reliability (intra-class correlation coefficient [ICC] = 0.92, 90% confidence interval [CI] = 0.89–0.95). Notio showed an almost perfect relationship with both TAS (ICC = 0.99, 90% CI = 0.98–0.99) and the mathematical model (ICC = 0.99, 90% CI = 0.98–0.99). However, the CdA values provided by the former (0.308 ± 0.051 m2) were significantly higher (albeit with a trivial effect size [ES]) compared with TAS (0.300 ± 0.051 m2, p < 0.001, ES = 0.15) and the mathematical model (0.303 ± 0.051 m2, p = 0.005, ES = 0.09). The CdA was higher in...