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Changes in active mouth opening following a single treatment of latent myofascial trigger points in the masseter muscle involving post-isometric relaxation or strain/counterstrain

Journal: Journal of Bodywork and Movement Therapies Date: 2006/07, 10(3):Pages: 197-205. doi: Subito , type of study: randomized controlled trial

Full text    (https://www.bodyworkmovementtherapies.com/article/S1360-8592(05)00081-1/fulltext)

Keywords:

active mouth opening [3]
masseter muscle [4]
muscle energy technique [157]
myofascial trigger points [9]
OMT [2951]
osteopathic manipulative treatment [2973]
post-isometric relaxation [4]
randomized controlled trial [710]
strain/counterstrain technique [1]

Abstract:

The aim of this study was to compare the immediate effect, on active mouth opening, following a single treatment of latent myofascial trigger points (MTrPs) in the masseter muscle involving a muscle energy technique, i.e. post-isometric relaxation, and the strain/counterstrain technique. Ninety subjects, 42 men and 48 women, aged 19-44 years old, participated in this study. Subjects underwent a screening process to establish the presence of MTrPs in the masseter muscle as described by Simons et al. Subjects were divided randomly into three groups: group A which was treated with a post-isometric relaxation technique, group B treated with the strain/counterstrain technique, and group C as control group. The outcome measure was the maximum active mouth opening. It was assessed pre-treatment and 5min post-treatment by an assessor blinded to the treatment allocation of the subject. Within-group changes showed a significant improvement in active mouth opening following application of the post-isometric relaxation technique (P <0.001), but not following application of strain/counterstrain (P=0.08). The control group did not show any change (P<0.1). Pre–post-effect sizes were large in the post-isometric relaxation group (d=1.46), small to medium in the strain/counterstrain group (d=0.32) and small in the control group (d=0.01). Differences were found between the post-isometric relaxation group and both the strain/counterstrain and control groups (P<0.001), but not between these two latter groups (P=0.8). Our results suggest that the post-isometric relaxation technique might be employed in the management of latent MTrPs in the masseter muscle in order to improve the maximum mouth opening.


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