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The present study aimed to investigate the effect of acute nocturnal melatonin (MEL) ingestion on sleep quality, cognitive performance, and postural balance in older adults. A total of 12 older men (58 ± 5.74 years) volunteered to participate in this study. The experimental protocol consisted in two testing sessions after nocturnal MEL (10 mg) or placebo ingestion the night before the tests. During each session, sleep quality tests, cognitive tests, and postural balance protocol were conducted. Static and dynamic postural control was assessed using a force platform. Most of the sleep parameters have been improved following nocturnal MEL ingestion without any effect on cognitive performance. Likewise, measurements related to the center of pressure (CoP) have been significantly decreased with MEL compared with placebo. In conclusion, postural control has been improved the morning following nocturnal MEL ingestion in older adults. This trend could be explained by the potential effect of MEL on sleep quality and cerebellum.
Kamoun is with the High Institute of Sport and Physical Education, Manouba University, Manouba, Tunisia. Yahia, Dhari, Ksentini, and Elleuch are with the Dept. of Physical Medicine and Functional Rehabilitation, Habib Bourguiba University Hospital, Sfax, Tunisia. Hammouda is with Research Unit, Molecular Bases of Human Pathology, Faculty of Medicine of Sfax, Sfax, Tunisia. Hammouda and Driss are with Research Center on Sport and Movement (Centre de Recherches sur le Sport et le Mouvement, CeRSM), UPL, Univ Paris Nanterre, UFR STAPS, Nanterre, France. Kamoun, Yahia, Ksentini, and Elleuch are with The Research Unit of the Assessment of Musculoskeletal Disorders, University of the South, Sfax, Tunisia. Souissi is with the National Observatory of Sport, Tunis, Tunisia.