Intra-individual variability of sleep and nocturnal cardiac autonomic activity in elite female soccer players during an international tournament.

Autor: Costa J; Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, CIFI2D, Porto, Portugal.; Portugal Football School, Portuguese Football Federation, FPF, Oeiras, Portugal., Figueiredo P; Portugal Football School, Portuguese Football Federation, FPF, Oeiras, Portugal.; Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, University Institute of Maia, ISMAI, Maia, Portugal., Nakamura F; Associate Graduate Program in Physical Education UPE/UFPB, João Pessoa, PB, Brazil., Rago V; Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, CIFI2D, Porto, Portugal.; Portugal Football School, Portuguese Football Federation, FPF, Oeiras, Portugal., Rebelo A; Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, CIFI2D, Porto, Portugal., Brito J; Portugal Football School, Portuguese Football Federation, FPF, Oeiras, Portugal.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2019 Sep 17; Vol. 14 (9), pp. e0218635. Date of Electronic Publication: 2019 Sep 17 (Print Publication: 2019).
DOI: 10.1371/journal.pone.0218635
Abstrakt: Purpose: To describe individual sleeping patterns and nocturnal cardiac autonomic activity of National team female soccer players during an international tournament.
Materials and Methods: Twenty elite female soccer players (aged 25.2±3.1 years) wore wrist actigraph units and heart rate (HR) monitors during night-sleep throughout 9 consecutive days (6 day-time training sessions [DT], 2 day-time matches [DM], and 1 evening-time match [EM]) of an international tournament. Training and match loads were monitored using the session-rating of perceived exertion (s-RPE) and wearable 18-Hz GPS (total distance covered [TD], training and match exposure time, and high-speed running [HSR]) to characterize training and match loads.
Results: Individually, s-RPE, TD, exposure time, and HSR during training sessions ranged from 20 to 680 arbitrary units (AU), 892 to 5176 m, 20 to 76 min, and 80 to 1140 m, respectively. During matches, s-RPE, TD, exposure time, and HSR ranged from 149 to 876 AU, 2236 to 11210 m, 20 to 98 min, and 629 to 3213 m, respectively. Individually, players slept less than recommended (<7 hours) on several days of the tournament, especially after EM (n = 8; TST ranging between 6:00-6:54 h). Total sleep time coefficient of variation (CV) ranged between 3.1 and 18.7%. However, all players presented good sleep quality (i.e., sleep efficiency ≥75%; individual range between: 75-98%) on each day of the tournament. Most of the players presented small fluctuations in nocturnal cardiac autonomic activity (individual nocturnal heart rate variability [HRV] ranged from 3.91-5.37 ms and HRV CV ranged from 2.8-9.0%), while two players presented higher HRV CV (11.5 and 11.7%; respectively).
Conclusion: Overall, this study highlights the substantial individual variability in sleep and HRV measures, suggesting the adoption of an individual approach to monitor sleep, training and match loads and recovery, to better understand how players cope with highly demanding competitions.
Competing Interests: FIFA Research Scholarship/grant 2017 (International Centre for Sports Studies [CIES] and Fédération Internationale de Football Association [FIFA]) funding was provided for this study, to purchase technical equipment and devices necessary for the conduct of the research. The study was also supported by two individual doctoral grants from Fundação para a Ciência e a Tecnologia: Júlio Costa (SFRH/BD/128531/2017) and Vincenzo Rago (SFRH/BD/129324/2017). This does not alter our adherence to PLOS ONE policies on sharing data and materials.
Databáze: MEDLINE
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