108337 20211115135505.0 doi 10.23736/S0022-4707.20.10860-0 sideral 121254 ART-2020-121254 eng Calleja-Romero, A. (orcid)0000-0002-5625-7863 Effects of a 75-km mountain ultra-marathon on heart rate variability in amateur runners 2020 BACKGROUND: This study examined the effects of a mountain ultra-marathon (MUM) on the activity of the autonomous nervous system through heart rate variability (HRV) monitoring and determined whether this variable related to final performance. METHODS: Heart rate and HRV were measured in eight male amateur runners (aged 37-60 years). Measurements were recorded before and after the event, in resting conditions, as well as continuously throughout the whole MUM. In addition, percentage (%) of heart rate reserve (HRres) and partial and total times during the race were analyzed. RESULTS: Average heart rate (HRavg) measured at rest was increased after the event (+37%). Standard deviation of successive differences (SDSD) and the square root of the mean squared differences of successive NN intervals (RMSSD) were reduced after the MUM (-56% and -59%, respectively). There was a positive relationship between the frequency-domain index normalized low frequency power (PLFn) measured at rest before the event and race time (0.79) while there was a negative relationship between race time and the difference in HRavg before and after the event. In the last half of the event, there was a high correlation (Spearman coefficient of correlation >0.9) between race time and the standard deviation of the NN intervals (SDNN) registered during the race. CONCLUSIONS: Autonomous cardiac regulation can be related to the performance in a mountain ultra-marathon. HRV monitoring could represent a practical tool for the evaluation of the relationship between the autonomous nervous system activity and performance in a mountain ultra-marathon. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 1.637 2020 SPORT SCIENCES 71 / 88 = 0.807 2020 Q4 T3 0.537 2020 Orthopedics and Sports Medicine 2020 Q2 Sports Science 2020 Q2 Physical Therapy, Sports Therapy and Rehabilitation 2020 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion López-Laval, I. Universidad de Zaragoza (orcid)0000-0002-9304-3709 Sitko, S. Universidad de Zaragoza (orcid)0000-0003-0455-6172 Hernando, D. (orcid)0000-0002-1462-4880 Vicente-Rodríguez, G. Universidad de Zaragoza (orcid)0000-0002-4303-4097 Bailón, R. Universidad de Zaragoza (orcid)0000-0003-1272-0550 Garatachea, N. Universidad de Zaragoza (orcid)0000-0001-8374-9081 1006 245 Universidad de Zaragoza Dpto. Fisiatría y Enfermería Área Educación Física y Depor. 5008 800 Universidad de Zaragoza Dpto. Ingeniería Electrón.Com. Área Teoría Señal y Comunicac. 60, 10 (2020), 1401-1407 J. Sports Med. Phys. Fitness The Journal of sports medicine and physical fitness 0022-4707 279651 http://zaguan.unizar.es/record/108337/files/texto_completo.pdf Postprint 2939596 http://zaguan.unizar.es/record/108337/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:108337 articulos driver 2021-11-15-08:57:42 ARTICLE