The vast majority of theses in this collection are open access and freely available. There are a small number of theses that have access restricted to the WWU campus. For off-campus access to a thesis labeled "Campus Only Access," please log in here with your WWU universal ID, or talk to your librarian about requesting the restricted thesis through interlibrary loan.

Date Permissions Signed


Date of Award


Document Type

Masters Thesis

Degree Name

Master of Science (MS)


Health and Human Development

First Advisor

Brilla, Lorraine R., 1955-

Second Advisor

Suprak, David N. (David Nathan)

Third Advisor

San Juan, Jun G.


The process of aging includes changes in muscle and connective tissue architecture and function, increased stiffness, loss of strength and functionality. Nonetheless, older adults are able to maintain eccentric (ECC) strength levels in a greater proportion, when compared to maintaining isometric (ISO) strength and concentric (CON) strength. The purpose of this study was to compare CON, ECC and ISO leg extension torque between trained (T) and untrained (U) older adults. Twenty older adults (60 years and older) who had no knee pathologies were recruited. A Biodex dynamometer was used to measure leg extensor torque for ISO, CON and ECC, in T and U subjects. Torque values relative to body weight (relative torques) were determined for each subject and compared between groups. The ratio of ECC: ISO was calculated and compared across groups. The T group were significantly stronger for ISO (p = 0.009). No significant differences were found for CON (p = 0.088) and ECC (p = 0.220). In addition, the U group registered a significantly higher ratio of ECC: ISO (p = 0.029), when compared to the T group. The findings in this study demonstrate older adults are able to maintain ECC, regardless of training status.





Western Washington University

OCLC Number


Subject – LCSH

Physical fitness for older people; Leg exercises--Physiological aspects; Aging--Physiological aspects; Muscle strength--Testing; Motor ability--Testing




masters theses




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 thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.

Included in

Kinesiology Commons