Sleep Profiles of Elite Swimmers During Different Training Phases
Journal of Strength and Conditioning Research
This study aims to describe the sleeping patterns during different training phases in competitive swimmers. Twelve national and international level swimmers (3 females, 9 males) were monitored during 4 different phases consisting of a preparation training phase, a taper phase, a competition phase and a rest phase. Sleep parameters were assessed using wrist activity monitors and self-report sleep diaries. There was a moderately higher (d = 0.70 -1.00) sleep onset latency during the competition
... g the competition phase compared to taper, train and rest phase. Trivial to small differences were observed for total sleep time between phases (d = 0.05 -0.40). Sleep efficiency was moderately higher (d = 0.60 -0.75) in the training and taper phases compared to competition and rest. Restfulness and Fragmentation Index (FI) were lowest in the rest with differences between phases being small (d = 0.43 -0.51) for restfulness and small to moderate (d = 0.43 -0.62) for FI. Time in and out of bed was very largely later (d = 1.96 -2.34) in rest compared to the other phases. Total nap time was moderately lower in rest (d = 1.13 -1.18) compared to the training and competition phases whilst there was a small difference (d = 0.46) compared to taper. To conclude, whilst there were trivial to small differences in sleep quantity between phases, there are small to moderate differences in other sleep parameters. Specifically, sleep onset latency was higher during the competition phase. Additionally, this study highlights the substantial between-individual variations in sleep responses during different training phases.