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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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Ridha BEN CHEIKH 1-3, Imed LATIRI 4, Mohamed DOGUI 1-3, Helmi BEN SAAD 4, 5
1 Unit of Sleep Disorders, Department of Functional Exploration of Nervous System, Sahloul University Hospital Center 4054 Sousse,Tunisia; 2 Research Laboratory Technology and Medical Imagery LR12ES06, Faculty of Medicine of Monastir, University of Monastir, Tunisia; 3 Laboratory of Physiology, Monastir Faculty of Medicine, University of Monastir, Tunisia; 4 Laboratory of Physiology, Faculty of Medicine of Sousse, University of Sousse, Tunisia; 5 Department of Physiology and Functional Exploration, Farhat Hached University Hospital of Sousse, Tunisia
BACKGROUND: Most of the available literature related to aspects of sleep-deprivation is primarily focused on memory and learning and studies regarding its effects on selective- attention and/or physical performance especially the isometric-force are scarce. Moreover, the available literature included general population or some team sports (eg; volleyball). However, only few studies were done on athletes involved in combat sports (eg; Karate). The aim of the present study was to determine the effects of a total one-night-sleep- deprivation (NSD) on activator- and inhibitor-processes of selective-attention and on maximal-isometric-force in Karate athletes.
METHODS: Twelve Karate boys (age mean±SD: 16.9±0.8 Yrs) were included. The protocol consists of two successive sessions: a normal-night-sleep (NNS) and a total one- NSD. After each night, athletes performed selective-attention and muscle-strength-tests during the same following three periods (P) of the day: P1NNS or P1NSD: 8-9 am; P2NNS or P2NSD: 12 am-1 pm; P3NNS or P3NSD: 4-5 pm. The activator [simple- and choice-reaction- times (SRT, CRT, respectively)] and inhibitor (negative-priming) processes were evaluated “Superlab4.5 software, Cedrus, San Pedro, USA”. Maximal-force and maximal-force-time (MFT) of brachial biceps isometric-contraction were evaluated (dynamometer Globus ergo system®; Italy). Data were expressed as mean±SD. A non-parametric test was used to evaluate the sessions (NNS vs. SND for the same period) and time (P1NNS vs. NSD periods’) effects.
RESULTS: All athletes completed tests realized after NNS. 12, 11 and 4th athletes finished, respectively, P1NSD, P2NSD and P3NSD. Sessions effects: no statistical significant difference was found. Time effects: i) Significant increase of SRT at P2NSD vs. P1NNS (respectively, 345±47 vs. 317±33 ms); ii) Significant increase of MFT at P2NSD vs. P1NNS (respectively, 2172±260 vs.1885±292 ms) and iii) No significant changes of CRT; negative- priming reaction-time or MFT data.
CONCLUSION: Total one-NSD affects both activator-processes of selective-attention and maximal-isometric-strength, two qualities often used in Karate sports.