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Trunk and limb muscle activity during the application of a mobilisation type force to the vertebral column

Journal: International Journal of Osteopathic Medicine Date: 2006/03, 9(1):Pages: 41. doi: Subito , type of study: controlled clinical trial

Full text    (https://www.sciencedirect.com/science/article/pii/S1746068906000216)

Keywords:

controlled clinical trial [283]
muscle activity [1]
high velocity low amplitude thrust [5]
OMT [2951]
osteopathic manipulative treatment [2973]

Abstract:

Introduction A study of muscular activity has found that spinal manipulation (high speed manipulative thrusts) induces a reflex response at characteristic locations in pain-free subjects.1 In this study slower loadings (i.e. mobilisation) did not produce an electromyographic (EMG) response. However, as this study only investigated muscle responses during one frequency and at one level of force magnitude, it is not clear if other loading conditions would result in changes in muscle activity. Design Single linear experimental study. Methods Intervention: A manual posteroanterior (PA) mobilisation force was applied to asymptomatic subjects at three vertebral levels T6, T12 and L3. At each vertebral level the magnitude of the PA force was applied at low (70N), medium (140N) and high (210N) levels and at low (1.4Hz) and high (2.3Hz) frequencies. The PA mobilisation force was applied to the LBP subjects within a therapeutic dose. Participants: Eighteen asymptomatic subjects and three LBP subjects were studied. Outcome Measures: Muscular activity using surface EMG. Seven pairs of surface EMG electrodes were placed on seven muscle areas. Results The raw EMG signals and frequency spectra were visually inspected. There was no evidence of EMG activity during the application of the mobilisations in any of the muscle areas examined during any of the 18 mobilisation loading conditions examined in the asymptomatic (normal) population. Pilot data indicate this is not the case with the LBP subjects. The results from the symptomatic group will be compared to the normative data. Conclusions In pain-free subjects the application of PA mobilisations to the vertebral column applied at high, medium or low force magnitudes and at high or low frequencies does not elicit muscle activity close to or at a distance from the site of application. This normative data will allow comparison to a symptomatic population in order to get further information on the physiological mechanisms that result in the beneficial therapeutic effects of mobilisations seen in the clinical setting.


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