{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,11]],"date-time":"2025-09-11T17:08:44Z","timestamp":1757610524923,"version":"3.44.0"},"reference-count":53,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2025,8,30]],"date-time":"2025-08-30T00:00:00Z","timestamp":1756512000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["European Journal of Sport Science"],"published-print":{"date-parts":[[2025,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>To assess whether certain players are more vulnerable to postmatch sleep disturbances by examining the relationship between match demands\u2014collision frequency and locomotor load\u2014and sleep in professional male rugby union players. A linear mixed\u2010effects regression examined the relationship between match variables and sleep in 13 rugby players across three matches. Match variables included six physical demand variables derived from video analysis and GPS data (collision frequency, total distance, high\u2010speed distance, sprint distance, acceleration load and fast acceleration count) and two contextual variables (location and kick\u2010off time). Sleep variables collected via home\u2010based polysomnography included total sleep time, sleep efficiency, sleep onset\/offset, sleep onset latency, wake after sleep onset, number of awakenings and sleep stages (light, deep and rapid eye movement sleep [REM], evaluated both by proportion [%] and time [min]). Each match collision decreased total sleep time (<jats:italic>\u03b2<\/jats:italic>\u00a0=\u00a0\u22124\u00a0\u00b1\u00a01\u00a0min and <jats:italic>p\u00a0=<\/jats:italic>\u00a00.006) and REM sleep (time: <jats:italic>\u03b2<\/jats:italic>\u00a0=\u00a0\u22122\u00a0\u00b1\u00a00\u00a0min and <jats:italic>p\u00a0&lt;<\/jats:italic>\u00a00.001; proportion: <jats:italic>\u03b2<\/jats:italic>\u00a0=\u00a0\u22120.6\u00a0\u00b1\u00a00.2% and <jats:italic>p<\/jats:italic>\u00a0=\u00a00.021). Conversely, every 500\u00a0m increase in locomotor load (total distance) increased REM sleep (time: <jats:italic>\u03b2<\/jats:italic>\u00a0=\u00a0+6\u00a0\u00b1\u00a02\u00a0min and <jats:italic>p\u00a0=<\/jats:italic>\u00a00.014; proportion: <jats:italic>\u03b2<\/jats:italic>\u00a0=\u00a0+2.7\u00a0\u00b1\u00a00.6% and <jats:italic>p<\/jats:italic>\u00a0=\u00a00.002). Every 100\u00a0m increase in high\u2010speed distance was associated with decreased REM sleep time (<jats:italic>\u03b2<\/jats:italic>\u00a0=\u00a0\u22127\u00a0\u00b1\u00a03\u00a0min and <jats:italic>p\u00a0=<\/jats:italic>\u00a00.020). Match demands, including collision frequency and locomotor load, were associated with changes in postmatch sleep architecture in professional rugby players, particularly REM sleep. Furthermore, greater number of collisions was associated with reduced sleep quantity. Practitioners can leverage GPS and video analysis data to tailor additional sleep strategies aimed at improving postmatch sleep based on individual match demands.<\/jats:p>","DOI":"10.1002\/ejsc.70052","type":"journal-article","created":{"date-parts":[[2025,8,30]],"date-time":"2025-08-30T12:16:51Z","timestamp":1756556211000},"source":"Crossref","is-referenced-by-count":0,"title":["Heavy Hitters, Light Sleepers: Collision Frequency and Locomotor Load on Sleep Architecture in Professional Rugby Union Players"],"prefix":"10.1002","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5541-6431","authenticated-orcid":false,"given":"Kanon","family":"Uchiyama","sequence":"first","affiliation":[{"name":"School of Human Sciences (Exercise and Sport Science) The University of Western Australia  Perth Australia"},{"name":"Western Force  Perth Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"Peeling","sequence":"additional","affiliation":[{"name":"School of Human Sciences (Exercise and Sport Science) The University of Western Australia  Perth Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shona L.","family":"Halson","sequence":"additional","affiliation":[{"name":"School of Behavioural and Health Sciences McAuley at Banyo Australian Catholic University  Brisbane Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Machar","family":"Reid","sequence":"additional","affiliation":[{"name":"School of Human Sciences (Exercise and Sport Science) The University of Western Australia  Perth Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karen","family":"Wallman","sequence":"additional","affiliation":[{"name":"School of Human Sciences (Exercise and Sport Science) The University of Western Australia  Perth Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jennifer","family":"Walsh","sequence":"additional","affiliation":[{"name":"Centre for Sleep Science School of Human Sciences The University of Western Australia  Crawley Australia"},{"name":"Department of Pulmonary Physiology &amp; Sleep Medicine West Australian Sleep Disorders Research Institute Sir Charles Gairdner Hospital  Nedlands Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Simon","family":"Thomas","sequence":"additional","affiliation":[{"name":"Western Force  Perth Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4797-182X","authenticated-orcid":false,"given":"Olivier","family":"Girard","sequence":"additional","affiliation":[{"name":"School of Human Sciences (Exercise and Sport Science) The University of Western Australia  Perth Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,8,30]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1249\/mss.0000000000002403"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0006\u20108993(75)90369\u20108"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00424\u2010011\u20101044\u20100"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.18637\/jss.v032.b01"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-0-12-179060-8.50013-X"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ptsp.2018.11.010"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jsams.2021.11.044"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jsams.2023.12.004"},{"key":"e_1_2_8_10_1","first-page":"97","article-title":"Circadian and Sleep\u2010Dependent Regulation of Hormone Release in Humans","volume":"54","author":"Czeisler C. 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