Prediction of Half-Marathon Power Target using the 9/3-Minute Running Critical Power Test

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Abstract

Running power output allows for controlling variables that have been previously overlooked by relying solely on speed, such as surface, gradient and weight. The ability to measure this external load variable now enables the analysis of concepts that have pre-dominantly been studied in cycling, such as the Critical Power (CP), in the context of running. This study aims to predict the CP target at which trained athletes run a half-marathon and determine whether races of this distance can serve as a valid alternative to update the CP record. A group of nine trained athletes performed the 9/3-minute Stryd CP test and participated in a half-marathon race in two separate testing sessions conducted in the field. The average power during a half-marathon race is a valid alternative method for determining the CP in trained athletes, as evidenced by the agreement (95% CI:-0.11 to 0.37 W/kg) and trivial systematic bias (0.13 W/kg) between methods. The linear regression model half-marathon power = 0.97 + 0.75∙CP (W/kg) showed low standard error of estimate (0.29 W/kg) and significant large association between methods (r = 0.88; p = 0.002). Coaches and athletes should be aware that the CP target for a half-marathon race is 97.3% of the CP determined by the 9/3-minute Stryd CP test.

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APA

Olaya-Cuartero, J., Pueo, B., Villalon-Gasch, L., & Jiménez-Olmedo, J. M. (2023). Prediction of Half-Marathon Power Target using the 9/3-Minute Running Critical Power Test. Journal of Sports Science and Medicine, 22(3), 525–530. https://doi.org/10.52082/jssm.2023.525

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