Date of Award

12-2021

Degree Type

Creative Project

Degree Name

Master of Science (MS)

Department

Kinesiology and Health Science

Committee Chair(s)

Brennan Thompson

Committee

Brennan Thompson

Committee

Talin Louder

Committee

Eadric Bressel

Abstract

The transfer effects of isokinetic, eccentric-only resistance training programs on non-specific measures of muscle function such as isometric peak force, isokinetic concentric peak force and dynamic constant external resistance 1-repetition maximal strength (DCER 1RM) have been researched extensively in a single joint context, yielding mixed results. However, investigations involving multiple-joint isokinetic eccentric-only training models have been sparse. The purpose of this study was to investigate the transfer effects of a short-term multiple-joint isokinetic eccentric leg press (Eccentron) training program on several measures of lower-body strength and performance. Fifteen participants performed Eccentron training three times/week for four weeks and were evaluated for the training specific Eccentron peak force (EccPF), DCER 1RM on a leg press (LP 1RM), vertical jump height (VJ), as well as single-joint isokinetic eccentric (Ecc30), isokinetic concentric (Con150) and isometric peak torque (IsomPT) of the knee extensors before and after the training period. The training elicited a large improvement in EccPF (37.9%; Cohen’s d effect size (ES) = 0.86). A moderate effect was observed on LP 1RM (19.0%; ES = 0.48), the magnitude of the strength improvement being about one-half that of EccPF. There was a small effect on VJ, IsomPT and Ecc30 (ES = 0.30, 0.29 and 0.20 respectively), however, pre-post changes were not significant for IsomPT and Ecc30 (p = 0.16 and 0.33 respectively). Con150 testing showed no effect (ES = 0.04). These results suggest this type of training program elicits large strength improvement in the training specific measures, with a moderate transfer effect on concentric DCER strength of a similar movement (DCER LP), small effect on functional measures (VJ), and relatively poor transfer to single-joint measures. These results may be relevant to practitioners and clinicians to consider depending on the desired measurement outcomes of prospective training programs when using multiple-joint eccentric training modalities.

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