Caffeine use in a Super Rugby game and its relationship to post-game sleep

Eur J Sport Sci. 2018 May;18(4):513-523. doi: 10.1080/17461391.2018.1433238. Epub 2018 Feb 12.

Abstract

Objective: To examine the relationship between regular game-related caffeine consumption on sleep after an evening Super Rugby game.

Methods: Twenty elite rugby union players wore a wrist-activity monitor to measure sleep for three days before, three days after and on the night of an evening Super Rugby game (19:00-21:00). Players ingested caffeine as they would normally (i.e. before and sometimes during a game) and saliva samples were collected before (17:00) and after (21:30) the game for caffeine concentration.

Results: Compared to the nights leading up to the game, on the night of the game, players went to bed 3 h later (23:08 ± 66 min vs 02:11 ± 114 min; p < .001) and had 1:30 hh:mm less sleep (5:54 ± 2:59 vs 8:02 ± 1:24 hh:mm; p < .05) and four players did not sleep after the game. Post-game caffeine saliva concentrations were greater than pre-game levels in 17 players (Pre-game 0.40 µg/mL vs Post-game 2.77 µg/mL; p < .001). The increase in caffeine saliva concentrations was moderately associated with an increase in sleep latency (p < .05), a decrease in sleep efficiency (p < .05), and a trend for a decrease in sleep duration (p = .06) on game night.

Conclusion: Caffeine consumption before a Super Rugby game markedly increases post-game saliva caffeine levels. This may contribute to the observed 3.5 h delay in time at sleep onset and the 1.5 h reduction in sleep duration on the night of the game. This study highlights the need for a strategic approach to the use of caffeine within a Super Rugby team considering the potential effect on post-game sleep.

Keywords: Competition; recovery; team sport.

MeSH terms

  • Actigraphy
  • Adult
  • Athletes
  • Caffeine / administration & dosage*
  • Football*
  • Humans
  • Male
  • Saliva / chemistry
  • Sleep*
  • Young Adult

Substances

  • Caffeine