Date of Award

2001

Degree Type

Thesis

Degree Name

Bachelor of Science Honours

Faculty

Faculty of Communications, Health and Science

First Advisor

Dr Paul Sacco

Second Advisor

Kazunori Nosaka

Abstract

Eccentric exercise, which is when the muscle produces force as it lengthens, has been shown to result in decrements to muscle functions. This study was designed to investigate whether there was a difference between the muscle responses of untrained (n = 8) and resistance-trained (n = 8) individuals after a bout of high-intensity eccentric exercise of the elbow flexors. All subjects were males aged 18 to 45 years and recruited based on specific training criteria. Subjects performed l0 sets of 6 maximal eccentric contractions of the elbow flexor muscles on an isokinetic dynamometer. 10 seconds rest was provided between each repetition and 3 minutes rest between each set of the exercise protocol. The exercise bout resulted in significant (p<0.05) decreases in range of motion and maximal isometric and isokinetic concentric strength for both trained and untrained groups. However, as hypothesised the trained group recovered these muscle functions more quickly than the untrained group did. The untrained group also showed larger (p<0.033) increases in arm circumference than the trained group did. Although significant (p<0.05) levels of soreness and tenderness were experienced by both groups following the eccentric exercise, there was no difference between the two groups. The results from this research suggest that resistance-training provides a protection against exercise-induced muscle damage and results in a faster recovery of muscle function after a bout of high-intensity eccentric exercise.

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