Skip Navigation LinksHome > January 1991 - Volume 23 - Issue 1 > Static pre-load effect on knee extensor isokinetic concentri...
Medicine & Science in Sports & Exercise:
CLINICAL SCIENCE: CLINICAL INVESTIGATION: PDF Only

Static pre-load effect on knee extensor isokinetic concentric and eccentric performance.

JENSEN, REECE C.; WARREN, BRYAN; LAURSEN, CARLTON; MORRISSEY, MATTHEW C.

Collapse Box

Abstract

The effect of two static pre-load levels on isokinetic concentric (CON) and eccentric (ECC) performance of the knee extensors at 90[degrees]-s-1 was evaluated in 35 healthy subjects. The low pre-load level was 50 N, and the high level was 75% of a maximal voluntary isometric contraction, performed at the start angles of 100 degrees (CON) and 30 degrees (ECC) of knee flexion. A two-way ANOVA with two repeated measures (load and angle) and a Newman-Keuls post hoc analysis were performed to compare the interaction of pre-load and angle at every 5 degrees in the ROM. The differences in average torque, peak torque, and peak torque angle between the pre-load levels were also analyzed with repeated-measures Mests. The high pre-load condition had a significant increase in torque at 99, 95, 90, and 85 degrees concentrically and 31, 35, 40, 45, and 50 degrees eccentrically. In comparing the two pre-load conditions over the whole torque curve, there was a significant difference in average torque values of both CON and ECC, no significant difference in peak torque in either contraction, and a significant shift in peak torque angle with CON contractions only.

(C)1991The American College of Sports Medicine

Login

Article Tools

Share

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.

Connect With Us