García de Frutos, José M., Orquín-Castrillón, Francisco Javier, Marcos-Pardo, Pablo Jorge, Rubio-Arias, Jacobo Á., Martinez-Rodriguez, Alejandro Acute Effects of Work Rest Interval Duration of 3 HIIT Protocols on Cycling Power in Trained Young Adults García-De Frutos JM, Orquín-Castrillón FJ, Marcos-Pardo PJ, Rubio-Arias JÁ, Martínez-Rodríguez A. Acute Effects of Work Rest Interval Duration of 3 HIIT Protocols on Cycling Power in Trained Young Adults. International Journal of Environmental Research and Public Health. 2021; 18(8):4225. https://doi.org/10.3390/ijerph18084225 URI: http://hdl.handle.net/10045/114632 DOI: 10.3390/ijerph18084225 ISSN: 1661-7827 (Print) Abstract: High-Intensity Interval Training (HIIT) is described as a succession of short duration and maximum or near-maximum intensity efforts, alternated by recovery periods during which exercise continues at a lower intensity (active recovery) or is interrupted (passive recovery). Our objective was to evaluate the acute responses of three HIIT protocols of different work/rest interval times over the total time of the session, with self-selectable load and up to exhaustion, “all out”.The sample was composed of 22 male participants (n = 22) between 19 and 24 years old. The HIIT protocol consisted of one of the three HIIT protocols, of 30, 60 and 90 s density ratio 1:1 and with passive rest, with a total exercise duration of 10 min. The test was performed in a cycloergometer set in workload mode independent of the pedaling frequency. The comparison of the three HIIT protocols shows that the duration of the work/rest intervals, starting from 30 s of work, in the cycloergometer, there are no significant differences in the levels of lactate concentration in the blood, nor in the heart rate, since a similar amount is obtained in the three protocols. The percentage of maximum power developed reached in each HIIT protocol is related to the duration of the working intervals. Keywords:Power loss, Blood lactate concentration, Youth, Athletic performance MDPI info:eu-repo/semantics/article