| Autor: |
Nakamura FY; a NAR - Nucleus of High Performance in Sport , São Paulo , Brazil.; b Department of Physical Education , State University of Londrina , Londrina , Brazil., Pereira LA; a NAR - Nucleus of High Performance in Sport , São Paulo , Brazil., Rabelo FN; c Department of Futsal , Sport Club Corinthians Paulista , São Paulo , Brazil., Flatt AA; d Exercise Physiology Laboratory, Department of Kinesiology , University of Alabama , Tuscaloosa , AL , USA., Esco MR; d Exercise Physiology Laboratory, Department of Kinesiology , University of Alabama , Tuscaloosa , AL , USA., Bertollo M; e Department of Medicine and Aging Sciences, Behavioral Imaging and Neural Dynamics Center , University 'G. d'Annuzio' of Chieti-Pescara , Chieti , Italy., Loturco I; a NAR - Nucleus of High Performance in Sport , São Paulo , Brazil. |
| Abstrakt: |
This study aimed to compare the weekly natural log of the root-mean-square difference of successive normal inter-beat (RR) intervals (ln RMSSD Weekly ) and its coefficient of variation (ln RMSSD CV ) in response to 5 weeks of preseason training in professional male futsal players. A secondary aim was to assess the relationship between ln RMSSD Weekly and ln RMSSD CV . The ln RMSSD is a measure of cardiac-vagal activity, and ln RMSSD CV represents the perturbations of cardiac autonomic homeostasis, which may be useful for assessing how athletes are coping with training. Ten futsal players had their resting ln RMSSD recorded prior to the first daily training session on four out of approximately five regular training days · week -1 . Session rating of perceived exertion (sRPE) was quantified for all training sessions. Despite weekly sRPE varying between 3455 ± 300 and 5243 ± 463 arbitrary units (a.u.), the group changes in ln RMSSD Weekly were rated as unclear (using magnitude-based inference), although large inter-individual variability in ln RMSSD responses was observed. The ln RMSSD CV in weeks 4 and 5 were likely lower than the previous weeks. A large and significant negative correlation (r = -0.53; CI 90%: -0.36; -0.67) was found between ln RMSSD and ln RMSSD CV . Therefore, monitoring individual ln RMSSD responses is suggested since large inter-individual variations may exist in response to futsal training. In addition, higher values of ln RMSSD are associated with lower oscillations of cardiac autonomic activity. |
