Evidence map›Paper›PMID 31527865›Full record

ArticlePloS one2019

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

Júlio Costa, Pedro Figueiredo, Fábio Nakamura, Vincenzo Rago, António Rebelo, João Brito

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed, 2 pooled it
4.8field-weighted citation impact, top 4% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

26 citing papers in PubMed, 2 syntheses or guidelines pooled it, 47 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors at 3 institutions in 2 countries.

Júlio CostaCentre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, CIFI2D, Porto, Portugal.ORCID 0000-0002-8225-8667
Pedro FigueiredoPortugal Football School, Portuguese Football Federation, FPF, Oeiras, Portugal.
Fábio NakamuraAssociate Graduate Program in Physical Education UPE/UFPB, João Pessoa, PB, Brazil.
Vincenzo RagoCentre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, CIFI2D, Porto, Portugal.
António RebeloCentre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, CIFI2D, Porto, Portugal.ORCID 0000-0001-9105-7421
João BritoPortugal Football School, Portuguese Football Federation, FPF, Oeiras, Portugal.
Universidade do Porto · PTSport Lisboa e Benfica · PTUniversidade Federal da Paraíba · BR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeTo describe individual sleeping patterns and nocturnal cardiac autonomic activity of National team female soccer players during an international tournament. MATERIALS AND

methodsTwenty 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.

resultsIndividually, 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).

conclusionOverall, 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.

Indexed as

Athletic PerformancePhysical ExertionSleepSoccerAdultAutonomic Nervous SystemFemaleHeartHumansYoung Adult

Identifiers

PMID31527865
PMCPMC6748428
OpenAlexW2973474892

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.