ABSTRACTGavin Stuart. The Influence of Different Duration Dynamic Warm-ups on Vertical Jump Performance(Under the direction of Dr. Abbey Thomas) The benefits of a proper warm-up have long been well known but the specifics on warm-up duration have been lacking. The purpose of this study was to determine differences in vertical jump and muscular strength following 5 minute and 10 minute warm-up programs. A total of 12 healthy adults adults were used with 6 males and 6 females (age: 22.25±2.49 years, height: 171.77±12.96 cm, BMI: 24.73±3.41 kg/m2). Each participant completed two warm-up programs of differing durations on separate days with one week between sessions. Vertical jump and muscular strength were immediately tested using a Vertec and an isokinetic dynamometer. Differences in jump height and muscular strength were analyzed with repeated measures ANCOVAs using sex as covariate. T-tests were used in the event of significant interactions for all analyses. The results showed no differences in vertical jump following either duration warm-up. Knee extension strength showed a significant decrease following intervention while knee flexion strength showed an increase. Despite conflicting results, a warm-up should still be performed as part of an exercise routine.