Impact of Velocity-Based Training and Percentage-Based Training on Power Output

Faculty Sponsor

Kelly Helm


Arts and Sciences


Exercise Science

Presentation Type

Oral Presentation

Symposium Date

Spring 4-29-2021


This study examined the differences in power output after a six-week intervention of a percentage-based resistance training (PBT) and a velocity-based resistance training (VBT). Power output was measured by Harman’s formula; it requires body weight (kg) and jump height (cm). The null hypothesis stated that there would no significant difference between the VBT and PBT groups. Six males with at least two years of resistance training experience participated in the study. One participant had to withdraw from the study due to being quarantined by contact tracing of COVID-19. All participants performed three, counter movement jumps on a Just Jump Mat© and the mean height was applied to Harman’s Formula to find average and peak power (W). A 1RM back squat was performed to discover baseline percentages to be used in the intervention. For the PBT group, each session consisted of two warm sets of five repetitions and three work sets of five repetitions in barbell back squats. A VmaxPro Sensor© was used to track barbell velocities of the VBT group. A matched pairs t-test was performed for both the average and peak power. Matched pairs t-tests were performed for peak and average power and all five participants had a statistically significant increases in both categories. A two-sample t test could not be performed to determine significant difference between the PBT and VBT groups but by comparing averages between pre and post data, VBT had a higher increase in average power while PBT had a higher increase in peak power.

Biographical Information about Author(s)

Doug Haugh is a senior exercise science major with minors in human biology and coaching education. He is a currently a member of the football team at Valparaiso University. The author is passionate about athletic performance with goals of being a strength and conditioning coach at the collegiate or professional level.

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