{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,17]],"date-time":"2026-01-17T04:35:40Z","timestamp":1768624540037,"version":"3.49.0"},"reference-count":39,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2022,3,9]],"date-time":"2022-03-09T00:00:00Z","timestamp":1646784000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Applied Sciences"],"abstract":"<jats:p>The aim of this study was twofold: it (i) analyzed the weekly variations of sleep quality and training intensity of youth soccer players and (ii) analyzed the relationships between sleep quality and training intensity. This study followed an observational design. Twenty men youth players (age: 18.81 \u00b1 0.41 years) were monitored daily over two weeks for sleep quality and training intensity. Sleep quality was measured daily using the 15-item consensus sleep diary. The training intensity was measured daily using the CR-10 Borg\u2019s scale as a measure of rate of perceived exertion (RPE); a heart rate (HR) sensor was used to measure minimum, average and peak; a global positioning system (GPS) was used for measuring the total distance covered and distances covered at different speed thresholds. Repeated measures ANOVA was used to analyze the weekly variations of sleep quality and training intensity. The Pearson correlation test was executed to analyze the relationships between sleep quality and training intensity. Repeated measures ANOVA revealed significant within-week variations in sleep duration (hours) (p = 0.043), quality of sleep (p = 0.035), RPE (p = 0.007), session-RPE (p = 0.011), HRminimum (p = 0.027), HRpeak (p = 0.005), total distance (p &lt; 0.001), pace (p &lt; 0.002), distance covered at 3.00\u20136.99 km\/h (p &lt; 0.001), distance covered at 7.00\u201310.99 km\/h (p &lt; 0.001), distance covered at 11.00\u201314.99 km\/h (p &lt; 0.001), distance covered at 15.00\u201318.99 km\/h (p &lt; 0.001) and distance covered at &gt;19.00 km\/h (p &lt; 0.001). Significant small correlations were found between sleep duration before training and session-RPE (r = 0.252), total distance (r = 0.205), distance covered at 3.00\u20136.99 km\/h (r = 0.209) and distance covered at 7.00\u201310.99 km\/h (r = 0.265). Significant small correlations were found between session-RPE and sleep duration after (r = 0.233), total distance and quality of sleep after (r = 0.198), distance at 3.00\u20136.99 km\/h and quality of sleep after training (r = 0.220), distance covered at &gt;19.00 km\/h and quality of sleep after training (r = 0.286), session duration and rested feeling after training (r = 0.227), total distance and rested feeling after training (r = 0.202), distance covered at 11.00\u201314.99 km\/h and rested feeling after training (r = 0.222) and distance covered at &gt;19.00 km\/h and rested feeling after training (r = 0.214). In conclusion, sleep duration was longer in the training sessions during the middle of the week; the training intensity was also greater (485.8 \u00b1 56.8 A.U.). Moreover, sleep outcomes after training were slightly correlated with both physiological and locomotor demands.<\/jats:p>","DOI":"10.3390\/app12062791","type":"journal-article","created":{"date-parts":[[2022,3,9]],"date-time":"2022-03-09T11:30:38Z","timestamp":1646825438000},"page":"2791","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Sleep Quality and Training Intensity in Soccer Players: Exploring Weekly Variations and Relationships"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1772-1272","authenticated-orcid":false,"given":"Ana Filipa","family":"Silva","sequence":"first","affiliation":[{"name":"Escola Superior Desporto e Lazer, Instituto Polit\u00e9cnico de Viana do Castelo, Rua Escola Industrial e Comercial de Nun\u2019\u00c1lvares, 4900-347 Viana do Castelo, Portugal"},{"name":"Research Center in Sports Performance, Recreation, Innovation and Technology (SPRINT), 4960-320 Melga\u00e7o, Portugal"},{"name":"The Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6671-6229","authenticated-orcid":false,"given":"Rafael","family":"Oliveira","sequence":"additional","affiliation":[{"name":"The Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal"},{"name":"Sports Science School of Rio Maior, Polytechnic Institute of Santar\u00e9m, 2040-413 Rio Maior, Portugal"},{"name":"Life Quality Research Centre, 2040-413 Rio Maior, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1743-5989","authenticated-orcid":false,"given":"Zeki","family":"Akyildiz","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, Gazi University, Ankara 06560, Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3481-7775","authenticated-orcid":false,"given":"Mehmet","family":"Y\u0131ld\u0131z","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, Afyon Kocatepe University, Afyonkarahisar 03200, Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2037-6131","authenticated-orcid":false,"given":"Y\u00fccel","family":"Ocak","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, Afyon Kocatepe University, Afyonkarahisar 03200, Turkey"}]},{"given":"Mehmet","family":"G\u00fcnay","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences, Gazi University, Ankara 06560, Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8681-0642","authenticated-orcid":false,"given":"Hugo","family":"Sarmento","sequence":"additional","affiliation":[{"name":"University of Coimbra, Research Unit for Sport and Physical Activity (CIDAF), Faculty of Sport Sciences and Physical Education, 3004-504 Coimbra, Portugal"},{"name":"Research Unit for Sport and Physical Activity, Faculty of Sport Sciences and Physical Education, 3004-531 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9850-7771","authenticated-orcid":false,"given":"Adilson","family":"Marques","sequence":"additional","affiliation":[{"name":"ISAMB, University of Lisbon, 1649-004 Lisboa, Portugal"},{"name":"CIPER, Faculty of Human Kinetics, University of Lisbon, 1649-004 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4100-8765","authenticated-orcid":false,"given":"Georgian","family":"Badicu","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Special Motricity, University Transilvania of Brasov, 500068 Brasov, Romania"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9813-2842","authenticated-orcid":false,"given":"Filipe Manuel","family":"Clemente","sequence":"additional","affiliation":[{"name":"Escola Superior Desporto e Lazer, Instituto Polit\u00e9cnico de Viana do Castelo, Rua Escola Industrial e Comercial de Nun\u2019\u00c1lvares, 4900-347 Viana do Castelo, Portugal"},{"name":"Research Center in Sports Performance, Recreation, Innovation and Technology (SPRINT), 4960-320 Melga\u00e7o, Portugal"},{"name":"Instituto de Telecomunica\u00e7\u00f5es, Delega\u00e7\u00e3o da Covilh\u00e3, 1049-001 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,3,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"S69","DOI":"10.1080\/17461391.2011.643924","article-title":"Perceptions of team athletes on the importance of recovery modalities","volume":"14","author":"Venter","year":"2014","journal-title":"Eur. 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