title: Effect of long haul travel on maximal sprint performance and diurnal variations in elite skeleton athletes.
abstract: OBJECTIVE
  To quantify the impact of eastward long haul travel on diurnal variations in cortisol, psychological sensations and daily measurements of physical performance.
  
  
  METHODS
  Five elite Australian skeleton athletes undertook a long haul eastward flight from Australia to Canada (LH(travel)), while seven elite Canadian skeleton athletes did not travel (NO(travel)). Salivary cortisol was measured on awakening, 60 min and 120 min after awakening. Psychological sensations were measured with a questionnaire, and maximal 30 m sprints were performed once a day between 09:30 and 11:00 h local time.
  
  
  RESULTS
  Compared with baseline, average (SD) resting salivary cortisol decreased by 67% immediately after long haul travel (23.43 (5.71) nMol/l) (mean+/-90% confidence interval) in the LH(travel) group (p = 0.03), while no changes were found in the NO(travel) group (p = 0.74). There were no significant differences in 30 m sprint time between baseline and post-flight tests in the LH(travel) group (p>0.05). The LH(travel) group perceived themselves as "jet lagged" for up to 2 days after the flight (p = 0.01 for both midday lunch and evening dinner).
  
  
  CONCLUSIONS
  Despite a distinct phase change in salivary cortisol rhythmicity and the athletes perceiving themselves as "jet lagged", minimal disturbances in "one-off" maximal sprinting ability between 09:30 and 11:00 h local time were seen in a group of elite skeleton athletes after long haul eastward travel from Australia to Canada.
authors.affiliation: Department of Physiology, Australian Institute of Sport, Belconnen, ACT, Australia. nicola.bullock@ausport.gov.au
authors.forename: Nicola
authors.initials: N
authors.lastname: Bullock
authors.forename: David T
authors.initials: DT
authors.lastname: Martin
authors.forename: Angus
authors.initials: A
authors.lastname: Ross
authors.forename: Doug
authors.initials: D
authors.lastname: Rosemond
authors.forename: Frank E
authors.initials: FE
authors.lastname: Marino
mesh_terms: D000328:Adult; D000401:Aircraft; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000378:metabolism*; D020179:Jet Lag Syndrome / Q000503:physiopathology*; D008297:Male; D012420:Running / Q000502:physiology* / Q000523:psychology; D012463:Saliva / Q000737:chemistry; D013177:Sports / Q000502:physiology*; D011795:Surveys and Questionnaires
chemical_list: D006854:Hydrocortisone