Nieto, ClaudioSánchez, RaimundoBesomi, ManuelaOlavide, Pablo2022-03-172022-03-172021Nieto-Jiménez, C.; Sánchez, R.; Besomi, M. y Naranjo-Orellana, J. One Year Follow-Up with Heart Rate Variability in Trail Runners. Revista Internacional de Medicina y Ciencias de la Actividad Física y el Deporte.http://cdeporte.rediris.es/revista/inpress/artseguimiento1462e.pdfhttp://cdeporte.rediris.es/revista/inpress/artseguimiento1462e.pdfhttp://hdl.handle.net/11447/5738This study aims to analyze HRV measures to provide reference values for UltraTrail Running (UTR) athletes. Sixteen Chilean UTR (12 men and 4 women) weremonitored over one year follow up. These are baseline records for each participant over a full year, during which they maintained their usual training, competitive, and rest activities. The variable use to evaluate the parasympathetic activity was, the square root of the mean value of the sum of the squared differences of all successive RR intervals (RMSSD). Additionally, Stress Score (SS) was calculated from the Poincaré's scatter plot as an indicator of sympathetic activity. This study provided baseline HRV values for UTR athletes through a percentile distribution, both in time domain measurements and the Poincaré scatter plot, for a population of UTR athletes from daily 5-minute baseline records in the supine position upon waking up.enPercentilesHeart rate variabilityTraining loadUltra trail runningArticle