Date of Award

2016

Degree Type

Creative Project

Degree Name

Master of Science (MS)

Department

Health, Physical Education, and Recreation

First Advisor

Eadric Bressel

Abstract

The purpose of this study was to compare the effect of differing loads on landing kinetics on land, and in aquatic conditions. Twenty four NCAA DI athletes volunteered for this study twelve female soccer players and twelve female gymnasts. Participants performed three jumps with four differing external loads in both land and aquatic environments. External loads were body weight (BW), BW*1.1, BW*1.2, BW*1.3 and applied via a weighted vest. All external loads for both conditions were added based upon participants BW on land. Kinetic measures were peak force, rate of force development, and impulse of the landing phase of the plyometric countermovement jump. Data was collected via waterproof force-plate. Results were analyzed using a three-way repeated measures 2x2x4 ANOVA. There was no significant difference in any result based on sport. Aquatic environments reduced peak impact by 50.7%, rate of force development by 53.5%, and impulse by 38.6%. Increasing external load did not produce significant differences for impact peak force or rate of force development, but did produce significantly higher impact impulse for land based jumps (p=0.000). In an aquatic environment increasing load produced significant differences in all three kinetic values. The results for environment agree with previous studies. The results for loaded aquatic countermovement jumps in this study show increased landing kinetics over unloaded aquatic jumps, and decreased landing kinetics over unloaded land jumps. Adding external load in aquatic environments may utilized to increase landing kinetics, while remaining under kinetic values of land based plyometrics.

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