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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport


Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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The Journal of Sports Medicine and Physical Fitness 2018 Apr 04

DOI: 10.23736/S0022-4707.18.08341-X

Copyright © 2018 EDIZIONI MINERVA MEDICA

lingua: Inglese

Effect of voluntary teeth clenching and sitting posture on maximal static force of limb muscles

Ahmad H. ALGHADIR 1, Hamayun ZAFAR 2, Zaheen A. IQBAL 1 , Einas S. AL-EISA 1

1 Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia; 2 Department of Odontology, Clinical Oral Physiology, Umea University, Umea, Sweden


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BACKGROUND: People clench their teeth to activate facial, neck and abdominal muscles when they need to generate heavy muscle force against large resistance like lifting heavy objects, in order to gain possible ergogenic advantage. These are termed as remote voluntary contractions. Aim of this study was to evaluate the effect of voluntary teeth clenching on maximal voluntary contraction of extensors and flexors of the knee, shoulder and elbow joints of the dominant side during slouch and unsupported upright sitting.
METHODS: One hundred healthy young male adults (mean age 23.3 years) participated in this study. Maximal voluntary contraction was measured using a hand held dynamometer.
RESULTS: Jaw clenching caused different ergogenic effect during slouch versus unsupported sitting postures. The data revealed that during unsupported upright sitting, the effect of jaw clenching consistently results in larger maximal voluntary contraction of both extensor and flexor muscles of all the three studied joints. However, during slouch sitting, only the maximal voluntary contraction of extensors of elbow and flexors of knee were larger with clenched teeth position.
CONCLUSIONS: Jaw clenching can affect the maximal voluntary contraction of limb muscles which is sitting posture dependent. Jaw clenching can consistently facilitate certain muscles of the upper and lower limbs to generate greater force production during upright sitting.


KEY WORDS: Clenching - Posture - Static force of limb muscles

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Publication History

Article first published online: April 04, 2018
Manuscript accepted: March 9, 2018
Manuscript revised: February 12, 2018
Manuscript received: October 29, 2017

Per citare questo articolo

Alghadir AH, Zafar H, Iqbal ZA, Al-Eisa ES. Effect of voluntary teeth clenching and sitting posture on maximal static force of limb muscles. J Sports Med Phys Fitness 2018 Apr 04. DOI: 10.23736/S0022-4707.18.08341-X

Corresponding author e-mail

z_iqbal001@yahoo.com