かみしめ負荷前後におけるそしゃく筋痛患者のこう筋部圧痛しきい値の変化

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  • Pressure Pain Threshold Changes in Masseter Muscle before and after Sustained Maximum Volunary Contraction in the Patients with Masticatory Muscle Pain.

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To understand the intrinsic factors of the pain sensitivity in patients with masticatory muscle pain, pressure pain threshold (PPT) changes in masseter muscles were measured before and after clenching.<BR>Twenty-one outpatients (7 males, 14 females, aged 37.6±14.3) with unilateral masseter muscle pain lasting longer than 6 months were enrolled in the experimental group, and 19 healthy volunteers (7 males, 12 females, aged 41.7±7.4) were enrolled in the control group.<BR>PPT measurement was performed before, right after, 30 min after, and 60 min after clenching. All the PPT data were evaluated by using the one before clenching as the relative value of 100.<BR>During clenching, surface EMGs were recorded from both masseter muscles.<BR>All the recordings were performed on the day that the subjects did not feel any pain in the target region. Although little change was found in normalized PPTs on the control side of the control group and the symptomatic side of the experimental group at right after, 30 min after, and 60 min after clenching, those on the asymptomatic side increased to 111.9 and 113.6 at 30 min after and 60 min after clenching, respectively. Statistical significance was found in the PPTs between the asymptomatic side (111.9±23.0) and the symptomatic side (95.7±14.7) at 30 min after clenching (repeated measures ANOVA).<BR>From the results, it was considered that the PPTs measurement before and after clenching task could be suitable parameters for diagnosis of chronic masticatory muscle pain in patients.

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