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  • Title: Inter- and intra-rater reliability of the pressure threshold meter in measurement of myofascial trigger point sensitivity.
    Author: Delaney GA, McKee AC.
    Journal: Am J Phys Med Rehabil; 1993 Jun; 72(3):136-9. PubMed ID: 8512674.
    Abstract:
    This study was designed to establish the intra-rater and inter-rater reliability of measurements of trigger point sensitivity using a commercially available pressure threshold meter. Fifty healthy adult volunteers (25 men and 25 women, aged 20 to 51 years) underwent repeated pressure threshold readings from two separate trigger point locations in the trapezius muscle, TP2 (left) and TP3 (right) by two independent examiners. Pressure threshold readings, using a 1.0 kg/s application, were done alternately by each experimenter. Measurements from each trigger point were completed 5 minutes apart. Intraclass correlation coefficients (ICC) revealed the inter-rater reliability to be high for both the first (ICC = 0.82) and second trial (ICC = 0.90) of TP2 and for the first (ICC = 0.86) and second trial (ICC = 0.92) of TP3. Intra-rater reliabilities for TP3 (ICC = 0.91) were higher than for TP2 (ICC1 = 0.80; (ICC2 = 0.83). These results show that the pressure threshold meter is highly reliable in measuring trigger point sensitivity, between and within experimenters, and may be useful in the diagnosis and monitoring of treatment of myofascial pain syndrome.
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