Title

Scientific basis for eccentric quasi-isometric resistance training: A narrative review

Document Type

Journal Article

Publication Title

Journal of Strength and Conditioning Research

ISSN

1533-4287

Volume

33

Issue

10

First Page

2846

Last Page

2859

PubMed ID

31361732

Publisher

Wolters Kluwer

School

School of Medical and Health Sciences

Comments

Originally published as: Oranchuk, D. J., Storey, A. G., Nelson, A. R., & Cronin, J. B. (2019). Scientific basis for eccentric quasi-isometric resistance training: A narrative review. Journal of Strength and Conditioning Research, 33(10), 2846-2859.

Original article available here.

Abstract

Eccentric quasi-isometric (EQI) resistance training involves holding a submaximal, yielding isometric contraction until fatigue causes muscle lengthening and then maximally resisting through a range of motion. Practitioners contend that EQI contractions are a powerful tool for the development of several physical qualities important to health and sports performance. In addition, several sports involve regular quasi-isometric contractions for optimal performance. Therefore, the primary objective of this review was to synthesize and critically analyze relevant biological, physiological, and biomechanical research and develop a rationale for the value of EQI training. In addition, this review offers potential practical applications and highlights future areas of research. Although there is a paucity of research investigating EQIs, the literature on responses to traditional contraction types is vast. Based on the relevant literature, EQIs may provide a practical means of increasing total volume, metabolite build-up, and hormonal signaling factors while safely enduring large quantities of mechanical tension with low levels of peak torque. Conversely, EQI contractions likely hold little neuromuscular specificity to high velocity or power movements. Therefore, EQI training seems to be effective for improving musculotendinous morphological and performance variables with low injury risk. Although speculative due to the limited specific literature, available evidence suggests a case for future experimentation.

DOI

10.1519/JSC.0000000000003291

Access Rights

free_to_read

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