Send to

Choose Destination
Front Physiol. 2019 Jun 20;10:779. doi: 10.3389/fphys.2019.00779. eCollection 2019.

Nap Opportunity During the Daytime Affects Performance and Perceived Exertion in 5-m Shuttle Run Test.

Author information

UR15JS01: Education, Motricité, Sport et Santé (EM2S), High Institute of Sport and Physical Education of Sfax, University of Sfax, Sfax, Tunisia.
Department of Movement and Training Science, Institute of Sport and Sport Science, Heidelberg University, Heidelberg, Germany.
Department of Sport Science, Integrative and Experimental Training Science, University of Würzburg, Würzburg, Germany.
Applied Physiology Laboratory, Department of Kinesiology, Health Promotion, and Recreation, University of North Texas, Denton, TX, United States.
Institut Supérieur du Sport et de l'éducation Physique de Sfax, Université de Sfax, Sfax, Tunisie.
Activité Physique, Sport et Santé, UR18JS01, Observatoire National du Sport, Tunis, Tunisie.



To compare the effect of different durations of nap opportunity during the daytime on repeated high-intensity short-duration performance and rating of perceived exertion (RPE).


Seventeen physically active men (age: 21.3 ± 3.4 years, height: 176.7 ± 5.9 cm, body mass: 71.8 ± 10.2 kg) performed a 5 m shuttle run test [to determine best distance (BD), total distance (TD), and fatigue index (FI)] under four conditions: a 25 min nap opportunity (N25), a 35 min nap opportunity (N35), a 45 min nap opportunity (N45), and control condition (no-nap) (N0). The sleep quality of each nap opportunity was evaluated using a scale ranging from 0 "no sleep" to 10 "uninterrupted, deep sleep throughout." The four conditions were performed in a random order. RPE was recorded after each repetition of the 5 m shuttle run test and the mean score was calculated.


BD increased after N25 (+6%) and N45 (+9%) compared to N0 (p < 0.05) and was significantly higher after N45 compared to N35 (p < 0.05). Compared to N0, the three nap opportunity durations enhanced TD (p < 0.05) with greater enhancement after N45 compared to N25 (+8% vs. +3%) and N35 (+8% vs. +3%). For FI, no-significant differences were observed between the three nap opportunity durations and N0. The mean RPE score was significantly higher after N25 (+20%) and N0 (+19%) compared to N45 (p < 0.05). All participants were able to fall asleep during each nap condition with a sleep quality score of 6.9 ± 1.0, 7.0 ± 0.7, and 7.1 ± 0.8 for N25, N35, and N45.


A nap opportunity during the daytime was beneficial for physical performance and perceived exertion with the N45 being the most effective for improving performance and reducing fatigue during the 5 m shuttle run test. The implication of the present study is that athletes might benefit from a nap opportunity of 25, 35 or 45 min before practice or before a competition.


exercise; fatigue; nap; sleep; sport

Supplemental Content

Full text links

Icon for Frontiers Media SA Icon for PubMed Central
Loading ...
Support Center