Myofacial trigger point

Gröbli, Christian; Dommerholt, Jan

doi:10.1007/s003370050046

Cited by 15 publications

(1 citation statement)

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“…In the past (but not at the time of the measurements), all members of the secretarial group had been under medical treatment for their complaints. All secretaries reported pain at the trapezius trigger points (Gro¨bli and Dommerholt 1997). An additional inclusion criterion for the secretarial group was a minimum period of employment in this profession of 10 years (average 19.7; range 10-31 years) without interruption.…”

Section: Subjectsmentioning

confidence: 98%

Upper trapezius muscle conduction velocity during fatigue in subjects with and without work-related muscular disorders: a non-invasive high spatial resolution approach

et al. 2004

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The development of fatigue at the muscle fibre level can be assessed in terms of a decrease in conduction velocity (CV). The present study aimed to investigate if work-related muscular disorders in occupations characterised by static loads of long duration affect fatigue resistance in the painful muscle. A group of eight secretaries suffering from bilateral chronic muscle pain in the shoulder/neck region was compared to a group of healthy subjects. The upper trapezius muscle was studied under isometric contractions, holding the arm in the horizontal plane up to the endurance point. Changes in CV estimated at the motor unit level were investigated using a non-invasive high spatial resolution electromyographic (EMG) approach. In addition, the number of motor unit potentials per second (PPS), and the root mean square (RMS) of bipolar signals were assessed, and the results reported as the mean and standard error for each value. Subjects with work-related disorders showed less pronounced changes in CV with respect to healthy subjects. No differences between subjects with and without work-related disorders were encountered for the PPS and RMS. The present findings on CV indicate an increased fatigue-related recruitment of MUs in the painful muscle with respect to a healthy muscle. The fact that this recruitment is not reflected in the PPS and RMS estimates might be due to a fatigue-induced decrease in the firing rate and/or the de-recruitment of fatigued MUs. Furthermore, methodological limitations of the adopted method in the estimation of 'global' parameters such as the PPS and RMS have to be considered.

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Section: Subjectsmentioning

confidence: 98%