{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,17]],"date-time":"2026-01-17T02:49:20Z","timestamp":1768618160129,"version":"3.49.0"},"reference-count":34,"publisher":"Human Kinetics","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,3,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> To investigate the internal training loads of a professional Spanish female futsal team throughout 26\u00a0weeks of training including preseason and in-season weeks and verify the impact of training period and\/or training load magnitudes on heart-rate variability responses. Furthermore, we aimed to assess, intraindividually, the relationship between training load and the coefficient of variation (CV) of weekly natural log of the root mean square difference of successive normal interbeat (RR) intervals (lnRMSSD<jats:sub>CV<\/jats:sub>), obtained from \u223c5 measures per week, and recorded in the seated position. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> A within-subject design involved 12 high-level outfield female futsal players (mean [SD] age: 23.9 [3.4]\u00a0y). <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> lnRMSSD was significantly lower and lnRMSSD<jats:sub>CV<\/jats:sub> was significantly higher during the preseason (weeks 1\u20136) compared to in-season (weeks 7\u201326) (<jats:italic>P<\/jats:italic>\u2009&lt;\u2009.001). Individually, players presented <jats:italic>moderate<\/jats:italic> to <jats:italic>large<\/jats:italic> negative correlations between lnRMSSD<jats:sub>CV<\/jats:sub> and lnRMSSD during the 26\u00a0weeks of observation. Correlations ranged between <jats:italic>r<\/jats:italic><jats:sub>player4<\/jats:sub>\u2009=\u2009\u2212.41 (95% CI, \u2212.69 to \u2212.02) and <jats:italic>r<\/jats:italic><jats:sub>player12<\/jats:sub>\u2009=\u2009\u2212.55 (\u2212.78 to \u2212.18). Players also presented <jats:italic>moderate<\/jats:italic> to <jats:italic>very<\/jats:italic> <jats:italic>large<\/jats:italic> positive correlations between lnRMSSD<jats:sub>CV<\/jats:sub> and session rating of perceived exertion. Correlations ranged between <jats:italic>r<\/jats:italic><jats:sub>player7<\/jats:sub>\u2009=\u2009.41 (.04 to .71) and <jats:italic>r<\/jats:italic><jats:sub>player1<\/jats:sub>\u2009=\u2009.71 (.45 to .86). <jats:italic><jats:bold>Conclusion<\/jats:bold>:<\/jats:italic> Professional female futsal players in this study presented increased lnRMSSD and reduced lnRMSSD<jats:sub>CV<\/jats:sub> during 20\u00a0weeks into the competitive season compared to 6\u00a0weeks of preseason. Furthermore, lnRMSSD<jats:sub>CV<\/jats:sub> was negatively associated with lnRMSSD on an intraindividual basis. Finally, higher internal training loads were positively correlated with lnRMSSD<jats:sub>CV<\/jats:sub>, indicating that heart-rate variability is responsive to weekly training loads.<\/jats:p>","DOI":"10.1123\/ijspp.2021-0500","type":"journal-article","created":{"date-parts":[[2023,1,27]],"date-time":"2023-01-27T14:53:45Z","timestamp":1674831225000},"page":"306-312","source":"Crossref","is-referenced-by-count":5,"title":["Intraindividual Relationships Between Training Loads and Heart-Rate Variability in High-Level Female Futsal Players: A Longitudinal Study"],"prefix":"10.1123","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5336-3652","authenticated-orcid":true,"given":"F\u00e1bio Y.","family":"Nakamura","sequence":"first","affiliation":[{"name":"Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), University of Maia, Maia, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8225-8667","authenticated-orcid":true,"given":"J\u00falio A.","family":"Costa","sequence":"additional","affiliation":[{"name":"Portugal Football School, Portuguese Football Federation, FPF, Oeiras, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2165-2687","authenticated-orcid":true,"given":"Bruno","family":"Travassos","sequence":"additional","affiliation":[{"name":"Portugal Football School, Portuguese Football Federation, FPF, Oeiras, Portugal"},{"name":"Department of Sports Sciences, University of Beira Interior, Covilh\u00e3, Portugal"},{"name":"Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), CreativeLab Research Community, Vila-Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4151-5716","authenticated-orcid":true,"given":"Daniel","family":"Ortu\u00f1o","sequence":"additional","affiliation":[{"name":"Department of Physical Activity and Sport Sciences, International Excellence Campus \u201cMare Nostrum,\u201d Sport Science Faculty, University of Murcia, San Javier, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9091-0897","authenticated-orcid":true,"given":"Jos\u00e9","family":"Pino-Ortega","sequence":"additional","affiliation":[{"name":"Department of Physical Activity and Sport Sciences, International Excellence Campus \u201cMare Nostrum,\u201d Sport Science Faculty, University of Murcia, San Javier, Spain"}]}],"member":"100","reference":[{"issue":"8","key":"r1","series-title":"Int J Sports Physiol Perform","first-page":"994","article-title":"Smartphone-derived heart-rate variability and training load in a women\u2019s soccer team","volume":"10","author":"Flatt AA","year":"2015","unstructured":"Flatt AA, Esco MR. 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