Browsing by Author "Nieto, Claudio"
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Publication Associations between training load, heart rate variability, perceptual fatigue, sleep, and injury in endurance athletes during a 12-week training mesocycle(2025) Sanchez, Raimundo; Nieto, Claudio; Leppe, Jaime; Gabbett, Tim; Besomi, ManuelaThis study examined associations among training load (external and internal), heart rate variability (HRV), perceptual fatigue, sleep, and injury in endurance athletes during a 12-week training mesocycle. The aims were to (i) compare these parameters between injured and non-injured weeks and (ii) assess differences between high- and low-severity injuries. Fifteen endurance athletes (80% males; median age: 36.5 years; running experience: 5.5 years) participated. Injury severity was measured using the Oslo Sports Trauma Research Centre Questionnaire on Health Problems (OSTRCH). Training load (training stress score [TSS], Session-Rate of Perceived Exertion [sRPE]), HRV, perceptual fatigue (readiness to train and wellbeing), and sleep were collected through daily and weekly assessments over 12 weeks. The weekly injury prevalence over the 12-week period ranged from 7%–40%, with 47% classified as high severity. Injured weeks were characterised by significantly higher sleep-related impairment (p=.004, Hedge’sg=0.704), while all other variables did not significantly differ. Athletes who sustained more severe injuries exhibited lower TSS (p < .001, Hedge’sg=0.84), lower sRPE (p=.029, Hedge’sg=0.705), poorer subjective wellbeing (p=.003, Hedge’sg=0.753), and lower HRV (p=.059, Hedge’sg=0.487) in the week preceding the injury. This exploratory study provides preliminary insights into the potential role of sleep-related impairment, training load fluctuations, and HRV in injury severity among endurance athletes. While findings suggest benefits of integrating these measures into monitoring strategies, the small sample size limits generalisability and should be interpreted with caution.Item One year follow-up with heart rate variabiality in trail runnres(2021) Nieto, Claudio; Sánchez, Raimundo; Besomi, Manuela; Olavide, PabloThis 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.