For example, when adjusted for time, CXT ( p = 0.0033) and RXT ( p = 0.0039) had more than double the amount of elevation change than ROAD (2.0 ± 1.6 m However, other differences highlight some of the unique challenges of XT events. CXT bike durations were significantly higher than RXT ( p = 0.0003) or ROAD ( p = 0.001), as well as significant differences in NP RXT ( p = 0.0456), NP ROAD (0.0136), kJ expenditure RXT ( p = 0.0005), and kJ expenditure ROAD ( p = 0.0124). Race and field data are summarized in Table 1 There were no significant differences in temperature ( p > 0.13) or humidity ( p > 0.21). It is unclear whether XT cycling affects subsequent running performance different from ROAD cycling. XT athletes must be mindful of developing anaerobic fitness, technical ability, and aerobic fitness, all of which contribute to off-road cycling economy. Conclusions: XT race demands are unique and mirror mountain bike (MTB) and trail running demands. Race simulation data support these findings but failed to produce meaningful differences in running. OLS modelling indicates that slower running is linked to either greater total bike kJ expenditure (R 2 = 0.57 p < 0.001), or total meters gained (R 2 = 0.52 p < 0.001). Championship XT runs were slower than either regional ( p < 0.05) or ROAD ( p < 0.01) runs, but HR intensity profiles similar. Ordinary Least Squares (OLS) modelling suggested three variables were strongly related (R 2 = 0.84 p < 0.0001) to cycling performance: event type (XT vs ROAD), total meters climbed, and total bike duration. Championship XT events were longer ( p < 0.01), with higher kJ expenditure ( p < 0.001). XT events had twice the elevation change ( p Z2 or higher intensity. (3) Results: Weather conditions were not different across events. An ordinary least squares analysis was used to model differences between event types. Intensity was described using % HR max zones (Z) 1 87%, and W. (2) Methods: Laboratory and field data were collected when the athlete was at near peak fitness and included oxygen consumption (VO 2), heart rate (HR), power output (W), and blood lactate (BLC) during cycling and running, while HR, cycling W, and running metrics were obtained from training and race data files over a period of seven years. (1) Background: This report examines the unique demands of off-road triathlon (XT) by presenting physiological, field, and race data from a national champion off-road triathlete using several years of laboratory and field data to detail training and race intensity.
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