Year of Publication


Date of Thesis


Document Type


Degree Name

Master of Science


Exercise and Sport Sciences


Obesity is a chronic metabolic disorder that affects all genders, ages, races, and socioeconomic levels, and increases the likelihood of developing other physiological or metabolic diseases. Considering its adipogenic inhibitory characteristics, its effect on sleep, and sleep’s effect on physical activity, supplementary melatonin may help combat this metabolic disorder. The purpose of this study was to identify trends in how supplementary melatonin affects sleep quality, physical activity, and body composition. To that end, a 14-week intervention study following an ABA single-subject design was conducted consisting of Ithaca College staff and faculty between ages of 40-59 years, with a BMI > 25 kg/m2, a normal sleep schedule (e.g., no third shift), and with stable exercise habits. Three participants (male n = 2, female n = 1) of age range 46-51 and a starting weight range of 76.3-109.3 kg completed the study. Participants underwent 12 measurement collection sessions over the 14-week period (four during the initial baseline, four during the intervention period, four during the secondary baseline). During the intervention period, participants took a 3 mg dose of supplemental melatonin approximately one hour before sleep each night for eight weeks. Outcome measures collected included, 1) sleep quality, 2) physical activity, 3) body circumference measures 4) waist-hip-ratio, 5) skinfolds 6) percent body fat, and 7) body mass index. Consistent trends across participants included a decrease in arm circumference and no change in sleep duration. All other outcome measures had varying trends across participants. These inconsistencies across participants warrant further research to account for factors that may have contributed to them, especially the possible impact of a dose-to-mass ratio, less sleep restriction, and adapting an ABAB design.



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