Impact of different warm-up conditions on hamstring torque and power

by Sonnekalb, Sara.

Abstract (Summary)
Dr. Amy L. Morgan, Advisor A general warm-up including stretching is common procedure in many athletic endeavors and has been shown to have multiple benefits (Corbin & Noble, 1980; Cross & Worrell, 1999; Liemohn, 1988; Schilling & Stone, 2000; Schramm, Latin, Berg, & Stuberg, 2001; Shellock & Prentice, 1985). However, the effects of acute stretching immediately prior to maximal strength and power based activites is not conclusive. The hamstring muscle group is of interest because of its high incidence of injury, and it is also a common measure of flexibility. The purpose of this study was to determine how three different warm-up conditions prior to exercise influence active range of motion (AROM) and peak and average isokinetic muscle torque at two different speeds. Participants were moderately active males (N=19) between the ages of 18 and 25 years. All participants completed three warm-up conditions: jogging only (JO), jogging + stretching (JS), and jogging + stretching + 15-minute rest period (JSR). Nine dependent variables of the hamstrings were measured: concentric average torque, concentric peak torque, eccentric average torque, eccentric peak torque, and hamstring active range of motion. Each torque measure was taken at 60° and 120° per second. Data was measured using a Kin-Com isokinetic machine and manual goniometer. A two-way MANOVA was used to analyze data. AROM data was also assessed using a repeated measures (2x3) ANOVA to detect significant changes over time. Muscular torque data was not significantly different between warm-up conditions (p > 0.05). AROM showed significant increases after all 3 warm-up conditions (p < 0.05). iii These results demonstrate that a pre-activity warm-up which includes a minimum of 5 minutes of jogging was sufficient to promote increases in AROM, and these effects lasted for at least 15 minutes after warm-up was completed. iv
Bibliographical Information:


School:Bowling Green State University

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:torque exercise muscle strength hamstring


Date of Publication:

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