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

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

Author information

1
a Centre for Sleep Science, School of Human Sciences , The University of Western Australia , Crawley , WA , Australia.
2
b Western Force, Rugby WA , Floreat , WA , Australia.
3
c School of Human Sciences , The University of Western Australia , Crawley , WA , Australia.
4
d Centre for Microscopy, Characterisation and Analysis , The University of Western Australia , Crawley , WA , Australia.
5
e School of Population and Global Health , The University of Western Australia , Crawley , WA , Australia.
6
f Coastal Performance Consulting , Key West , FL , USA.
7
g Department of Physiology , The Australian Institute of Sport , Canberra , ACT , Australia.

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

PMID:
29431593
DOI:
10.1080/17461391.2018.1433238
[Indexed for MEDLINE]

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