Award Date

1-1-2001

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Kinesiology

First Committee Member

John Mercer

Number of Pages

81

Abstract

The purpose of this study was to investigate the possible mechanism responsible for the decrease in force during the 5°/sec velocity compared to the isometric velocity. Subjects (n = 9) completed MVC knee extension exercises during eccentric speeds of 5, 10, and 15°/sec, as well as isometric contractions. Extensor force and average EMG (aEMG) of the vastus lateralis (VL) and biceps femoris (BF) were quantified at knee angles of 55° and 65°. Six ANOVA (alpha = 0.05) tests determined a decrease in FT (p < 0.05) at both knee angles and a decrease in VL aEMG (p < 0.05) at 55° during 5°/sec condition compared to the isometric condition. No change in BF aEMG was observed across speeds (p > 0.05). It was concluded that there is a controlling mechanism which is neurological in nature which reduces F T during slow eccentric conditions.

Keywords

Isokinetic; Muscle; Performance; Slow; Speeds

Controlled Subject

Physical therapy; Physiology

File Format

pdf

File Size

2232.32 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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