title: Effects of a 2-Week High-Intensity Training Camp on Sleep Activity of Professional Rugby League Athletes.
abstract: OBJECTIVE
  To investigate the effects of a training camp on the sleep characteristics of professional rugby league players compared with a home period.
  
  
  METHODS
  During a 7-d home and 13-d camp period, time in bed (TIB), total sleep time (TST), sleep efficiency (SE), and wake after sleep onset were measured using wristwatch actigraphy. Subjective wellness and training loads (TL) were also collected. Differences in sleep and TL between the 2 periods and the effect of daytime naps on nighttime sleep were examined using linear mixed models. Pearson correlations assessed the relationship of changes in TL on individuals' TST.
  
  
  RESULTS
  During the training camp, TST (-85 min), TIB (-53 min), and SE (-8%) were reduced compared with home. Those who undertook daytime naps showed increased TIB (+33 min), TST (+30 min), and SE (+0.9%). Increases in daily total distance and training duration above individual baseline means during the training camp shared moderate (r = -.31) and trivial (r = -.04) negative relationships with TST.
  
  
  CONCLUSIONS
  Sleep quality and quantity may be compromised during training camps; however, daytime naps may be beneficial for athletes due to their known benefits, without being detrimental to nighttime sleep.
authors.forename: Heidi R
authors.initials: HR
authors.lastname: Thornton
authors.forename: Grant M
authors.initials: GM
authors.lastname: Duthie
authors.forename: Nathan W
authors.initials: NW
authors.lastname: Pitchford
authors.forename: Jace A
authors.initials: JA
authors.lastname: Delaney
authors.forename: Dean T
authors.initials: DT
authors.lastname: Benton
authors.forename: Ben J
authors.initials: BJ
authors.lastname: Dascombe
mesh_terms: D056044:Actigraphy; D000328:Adult; D056352:Athletes; D005538:Football / Q000502:physiology*; D006801:Humans; D008297:Male; D064797:Physical Conditioning, Human / Q000502:physiology*; D012890:Sleep; D055815:Young Adult
keywords: napping; preseason; recovery; team sports; travel