ArticleBMC musculoskeletal disorders2013
Myofascial trigger points and innervation zone locations in upper trapezius muscles.
Article in BMC musculoskeletal disorders, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT03944889 (Quantitative Response of Healthy Muscle Following the Induction of Capsaicin), which is not on this map. Cited by 20 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Quantitative Response of Healthy Muscle Following the Induction of Capsaicin
Who cites it
20 citing papers in PubMed, 65 citations in OpenAlex.
- Effect of photobiomodulation on trapezius myofascial pain: a randomized, sham-controlled, double-blind clinical trial.Lasers in medical science · 2026Trial
- Trial
- Intensive vasodilatation in the sciatic pain area after dry needling.BMC complementary and alternative medicine · 2015Trial
- Diagnostic Utility of Surface Electromyography for Identifying Muscles Affected by Myofascial Trigger Points: A Scoping Review.Biomedicines · 2026Review
- Anatomical Investigation of the Gluteus Medius Muscle Innervation and Its Topographical Correspondence With Myofascial Trigger Points.BioMed research international · 2026Article
- Anatomical study of the innervation of the tibialis anterior muscle and its relationship with myofascial trigger points.Acta cirurgica brasileira · 2026Article
- Sarcolemmal Excitability Properties of the Trapezius.Muscle & nerve · 2025Article
- Anatomical Bases of the Temporal Muscle Trigger Points.BioMed research international · 2024Article
- Anatomical analysis of the intramuscular distribution patterns of the levator scapulae and the clinical implications for pain management.Surgical and radiologic anatomy : SRA · 2023Article
- Cervical Myofascial Pain Is Associated with an Imbalance of Masticatory Muscle Activity.International journal of environmental research and public health · 2022Article
- Dry Needling and Antithrombotic Drugs.Pain research & management · 2022Review
- High-density surface electromyographic assessment of pelvic floor hypertonicity in IC/BPS patients: a pilot study.International urogynecology journal · 2021Article
- Combining Patient Education With Dry Needling and Ischemic Compression for Treating Myofascial Trigger Points in Office Workers With Neck Pain: A Single-Blinded, Randomized Trial.Journal of chiropractic medicine · 2020Article
- Global Innervation Zone Identification With High-Density Surface Electromyography.IEEE transactions on bio-medical engineering · 2020Article
- A Preliminary Study of Effects of Channel Number and Location on the Repeatability of Motor Unit Number Index (MUNIX).Frontiers in neurology · 2020Article
- Anatomical Study of the Innervation of the Masseter Muscle and Its Correlation with Myofascial Trigger Points.Journal of pain research · 2020Article
- Motor unit innervation zone localization based on robust linear regression analysis.Computers in biology and medicine · 2019Article
- Changes in Muscle Stiffness of the Trapezius Muscle After Application of Ischemic Compression into Myofascial Trigger Points in Professional Basketball Players.Journal of human kinetics · 2018Article
- Skin Resistivity Value of Upper Trapezius Latent Trigger Points.BioMed research international · 2015Article
- Myofascial trigger points: peripheral or central phenomenon?Current rheumatology reports · 2014Review
Corrections and comments
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Authors and funding
7 authors at 3 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundMyofascial trigger points (MTrPs) are hyperirritable spots located in taut bands of muscle fibres. Electrophysiological studies indicate that abnormal electrical activity is detectable near MTrPs. This phenomenon has been described as endplate noise and it has been purported to be associated MTrP pathophysiology. Thus, it is suggested that MTrPs will be overlap the innervation zone (IZ). The purpose of this work was to describe the location of MTrPs and the IZ in the right upper trapezius.
methodsWe screened 71 individuals and eventually enrolled 24 subjects with neck pain and active MTrPs and 24 neck pain-free subjects with latent MTrPs. Surface electromyography (sEMG) signals were detected using an electrode matrix during isometric contraction of the upper trapezius. A physiotherapist subsequently examined the subject's trapezius to confirm the presence of MTrPs and establish their location. IZ locations were identified by visual analysis of sEMG signals. IZ and MTrPs locations were described using an anatomical coordinate system (ACS), with the skin area covered by the matrix divided into four quadrants.
resultsNo significant difference was observed between active and latent MTrPs locations (P = 0.6). Forty-five MTrPs were in the third quadrant of the ACS, and 3 were included in second quadrant. IZs were located approximately midway between the seventh cervical vertebrae and the acromial angle in a limited area in the second and third quadrants. The mean distance between MTrP and IZ was 10.4 ± 5.8 mm.
conclusionsAccording to the acquired results, we conclude that IZ and MTrPs are located in well-defined areas in upper trapezius muscle. Moreover, MTrPs in upper trapezius are proximally located to the IZ but not overlapped.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.