doi:10.1055/a-2079-1363engSitko, SebastiánCirer-Sastre, RafelLópez-Laval, IsaacAn update of the Allen & Coggan Equation to predict 60-min power output In cyclists of different performance levelsART-2023-137056The Allen & Coggan protocol suggests that 95% of the power output during a 20-min time trial is a valid surrogate for 60-min maximal power. The validity of this concept has not been studied previously in cyclists with different performance levels. As a result, we classified 120 cyclists in our study as recreationally trained, trained, well trained or professional, based on their maximal oxygen consumption. Participants performed a functional threshold power testing protocol based on a 20-min time trial and a 60-min time trial, separated by a 72-hour rest. Sixty-minute maximal power was successfully modeled with 20-min maximal power and performance group using 2/3 of the dataset (R2=0.77, 95% CrI [0.74, 0.79]) with different coefficients for each group: Professional: PO60min=PO20min × 0.96; well trained: PO60min=PO20min × 0.95; trained: PO60min=PO20min × 0.92 and recreationally trained: PO60min=PO20min × 0.88. The predictions of the original equation and our model were assessed using the remaining third of the data. The predictive performance of the updated equation was better (original: R2=0.51, mean absolute error=27 W, mean bias=–12 W; updated: R2=0.54, mean absolute error=25 W, mean bias=–7 W).2023http://zaguan.unizar.es/record/13169210.1055/a-2079-1363http://zaguan.unizar.es/record/131692oai:zaguan.unizar.es:131692INTERNATIONAL JOURNAL OF SPORTS MEDICINE 44, 13 (2023), 983-987All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/closedAccess