Faculty Collaboration Database

The effect of remote voluntary contractions on knee extensor torque. Med Sci Sports Exerc 2008 Oct;40(10):1805-9

Date

09/19/2008

Pubmed ID

18799991

DOI

10.1249/MSS.0b013e31817dc4ad

Scopus ID

2-s2.0-58149308388 (requires institutional sign-in at Scopus site)   37 Citations

Abstract

PURPOSE: Concurrent activation potentiation (CAP) is purported to enhance the force capabilities of muscles via the contraction of muscles remote to the prime mover. This phenomenon has been described as remote voluntary contractions (RVC). The objective of this study was to assess a variety of RVC and their effect on isometric knee extensor torque to evaluate the existence of CAP.

METHODS: Twelve males who regularly participated in lower body resistance training served as subjects. Subjects performed maximum voluntary isometric contractions (MVIC) of the knee extensors without RVC, as well as in a variety of conditions that included RVC, in a randomized order. The RVC conditions included jaw clenching, bilateral gripping, jaw clenching combined with contralateral gripping and the Valsalva maneuver, and the combination of jaw clenching, bilateral gripping, and the Valsalva maneuver.

RESULTS: A repeated-measures ANOVA revealed significant main effects (P = 0.001) for RVC condition. Bonferroni-adjusted post hoc analysis identified several differences in RVC compared with the NO-RVC condition (P < 0.05). The RVC condition including jaw clenching, bilateral gripping, and the Valsalva maneuver resulted in approximately 14.6% and 14.8% greater average and peak torque, respectively, compared with the NO-RVC condition.

CONCLUSIONS: These findings indicate that RVC augment torque, which may be useful during the performance of resistance training as well as athletic tasks that require acute maximal strength. These findings support the existence of the CAP phenomenon.

Author List

Ebben WP, Leigh DH, Geiser CF

Author

Christopher Geiser BS,MS Assistant Professor/Athletic Training Director in the Exercise Science department at Marquette University

MESH terms used to index this publication - Major topics in bold

Adult
Analysis of Variance
Humans
Isometric Contraction
Knee
Male
Torque
Valsalva Maneuver