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Date of Award

Fall 2023

Document Type

Masters Thesis

Department or Program Affiliation

Health and Human Development

Degree Name

Master of Science (MS)

Department

Health and Human Development

First Advisor

Brilla, Lorraine R., 1955-

Second Advisor

Suprak, David N. (David Nathan)

Third Advisor

San Juan, Jun G.

Abstract

The purpose of this study was to explore potential sex-specific differences in the torque-velocity relationship of the quadriceps and hamstrings. Sixteen male and 10 female recreationally active college students participated in the study. Concentric and eccentric peak torque was measured on a Biodex System 4 Pro at 60, 120, 180 and 240 °/s along with isometric peak torque at a knee angle of 60° (0° = full extension). Peak torque was then normalized to lean body mass as determined by hydrostatic weighing. The rate of change in peak torque as movement velocity increases was then analyzed for differences between sexes. The main finding of this study is that after normalizing peak torque to lean body mass there was no sex by velocity interaction (p > 0.05) for concentric muscle actions of the quadriceps, or for concentric and eccentric muscle actions of the hamstrings. However, there was a significant sex by velocity interaction for eccentric muscle actions of the quadriceps (p < 0.05, η2 = 0.358). Peak torque normalized to lean body mass accounts for many of the reported differences between sexes in peak torque and the rate of change in peak torque as movement velocity increases in the quadriceps and hamstrings. However, some sex-specific differences remain that result in a difference in the slope of the torque-velocity relationship between sexes for eccentric muscle actions of the quadriceps.

Type

Text

Keywords

torque-velocity relationship, sex differences, isokinetic, lean body mass

Publisher

Western Washington University

OCLC Number

1407236893

Subject – LCSH

Quadriceps muscle--Contraction--Sex differences; Hamstring muscle--Contraction--Sex differences; Torque--Physiological aspects--Measurement; Speed--Physiological aspects--Measurement; Eccentric loads; Isokinetic exercise--Physiological aspects; Isometric exercise--Physiological aspects; Body mass index

Format

application/pdf

Genre/Form

masters theses

Language

English

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

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