title: Morning melatonin ingestion and diurnal variation of short-term maximal performances in soccer players.
abstract: Aim Very few studies have investigated the temporal specificity of melatonin (MEL) ingestion upon short-term maximal athletic performances. The aim of the present study was to explore the effect of morning MEL ingestion on cognitive and physical performances measured in the afternoon. Methods Twelve soccer players from a Tunisian squad (17.9 ± 1.3 years, 1.74 ± 0.06 m and 62.0 ± 8.8 kg) participated in the present study. They performed two testing sessions at 08:00 h, 12:00 h and 16:00 h after either MEL (5mg) or placebo (PLA) ingestion, in a randomized order. During each period, the participants performed the following cognitive and physical tests: reaction time and vigilance tests, medicine-ball throw (MBT), five jumps, handgrip strength (HG), and agility tests. Results cognitive and physical performances were significantly higher at 16:00 h compared to 08:00 h during the two conditions (p < 0.05). Moreover, performances of MBT and HG were lower in the morning with MEL in comparison to PLA (p < 0.05). However, MEL ingestion did not affect physical and cognitive performances measured at 12:00 h and 16:00 h. Conclusion morning MEL ingestion has no unfavourable effect on afternoon physical and cognitive performances in soccer players.
authors.affiliation: Research Laboratory "Sport Performance Optimization", National Center of Medicine and Sciences in Sport (CNMSS) , Tunis , Tunisia.
authors.forename: K
authors.initials: K
authors.lastname: Ghattassi
authors.affiliation: Research Center on Sport and Movement (CeRSM, EA 2931), Sciences and Techniques of the Physical and Sporting Activities (UFR STAPS), University of Paris Ouest Nanterre La Defense , Nanterre , France.
authors.forename: O
authors.initials: O
authors.lastname: Hammouda
authors.affiliation: Research Laboratory "Sport Performance Optimization", National Center of Medicine and Sciences in Sport (CNMSS) , Tunis , Tunisia.
authors.forename: A
authors.initials: A
authors.lastname: Graja
authors.affiliation: Research Laboratory "Sport Performance Optimization", National Center of Medicine and Sciences in Sport (CNMSS) , Tunis , Tunisia.
authors.forename: N
authors.initials: N
authors.lastname: Boudhina
authors.affiliation: Research Laboratory "Sport Performance Optimization", National Center of Medicine and Sciences in Sport (CNMSS) , Tunis , Tunisia.
authors.forename: H
authors.initials: H
authors.lastname: Chtourou
authors.affiliation: High Institute of Sport and Physical Education, University of Sfax , Sfax , Tunisia.
authors.forename: S
authors.initials: S
authors.lastname: Hadhri
authors.affiliation: Research Center on Sport and Movement (CeRSM, EA 2931), Sciences and Techniques of the Physical and Sporting Activities (UFR STAPS), University of Paris Ouest Nanterre La Defense , Nanterre , France.
authors.forename: T
authors.initials: T
authors.lastname: Driss
authors.affiliation: High Institute of Sport and Physical Education, Ksar-Saïd, Manouba University , Tunis , Tunisia.
authors.forename: N
authors.initials: N
authors.lastname: Souissi
mesh_terms: D000293:Adolescent; D001143:Arousal / Q000187:drug effects; D056352:Athletes; D054874:Athletic Performance / Q000502:physiology; D002940:Circadian Rhythm / Q000187:drug effects* / Q000502:physiology; D004334:Drug Administration Schedule; D004435:Eating; D005080:Exercise Test; D018737:Hand Strength; D006801:Humans; D008550:Melatonin / Q000008:administration & dosage*; D011930:Reaction Time / Q000187:drug effects; D012420:Running / Q000502:physiology; D012916:Soccer; D055815:Young Adult
chemical_list: D008550:Melatonin
keywords: athletic performance; diurnal variation; melatonin; soccer