Year of Publication


Date of Thesis


Document Type


Degree Name

Master of Science


Exercise and Sport Sciences


This study examined the effect of extended sleep on reactive strength index (RSI) performance and decision-making skills of agility tasks. Participants (N = 15) volunteered for the study providing informed consent and were varsity student-athletes at Ithaca College. Participants attended five lab sessions over a six-week period with testing occurring at four of the lab sessions. Performance was measured by trials of the reactive strength index-drop jump test (RSI-DJ), a pre-planned change of direction (COD) test, and a reactive agility test (RAT). Participants were familiarized with testing protocols that were followed by a baseline period where habitual sleep patterns were recorded. After the two-week baseline period, participants were randomly assigned to either a sleep or control group. During the intervention period, the sleep group was required to extend their sleep by one-hour and the control group continued there habitual sleep patterns. The intervention period was two-weeks in duration. Each participant recorded sleep duration and quality throughout the duration of the study. Data were analyzed using a mixed design measures ANOVA. A pairwise comparison if the ANOVA yielded significant effects. The results showed participants from the sleep group increased their sleep duration by 11% and RSI by 5%. The reactive agility tests showed no significant changes; however, the sleep and control groups had faster decision making times upon posttest (5%). Practical application of this study is that extended sleep shows potential positive effects on reactive strength.



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