Title

Effect of Verbal Instruction on Depth Jump Performance

Document Type

Presentation

Journal/Book Title/Conference

USU Student Showcase

Publication Date

4-2014

Faculty Mentor

Eadric Bressel

Abstract

Plyometrics is a preferred method of training in jumping sports to increase leg power and vertical jump performance. Some may argue that the best exercise for improving overall vertical jump ability is the depth jump. The purpose of this study was to determine how to best perform the depth jump for overall leg power and propulsive impulse, which is directly related to vertical jump height.

Methods 13 healthy volunteers were used in this study and were told to perform a depth jump from a height of 35 cm onto a force platform immediately followed by a second jump from the ground. They were instructed to perform the second jump in two ways: one for maximum height(DJH) and one for least amount of contact time (DJT). To place emphasis on jump height,participants were given the verbal cue to jump as high as possible̥. To place emphasis on minimal contact time, participants were given the verbal cue to jump as quickly as possible̥.Max force (BW), contact time (s), propulsive impulse (BW*s), and max power (kW) were computed from the raw force data.Differences in these variables across conditions were assessed using multiple paired t-tests. Results Max force (DJT: 5.6 BW, DJH: 4.3 BW) and max power (DJT: 16.5 kW, DJH: 13.7kW) were greater for the DJT condition (p

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