Influence of endurance tasks on masticatory muscles.
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概要
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The purpose of the present study was to investigate the influence of endurance tasks on masticatory muscles. Twenty healthy volunteers without masticatory muscle pain were instructed to perform several endurance tasks. Each task consisted of clenching at a 50% maximum voluntary contraction (MVC) as long as possible with 1-minute intervals.<BR>The degree of masticatory muscle pain, pressure pain threshold (PPT), and bite force were measured before and after the endurance task. The degree of masticatory muscle pain at rest was measured with a 100 mm visual analog scale (VAS) . PPTs were measured at six masticatory muscle sites (superficial and deep masseter; anterior, middle and posterior temporalis; and sternocleidomastoid), and temporomandibular joint (lateral and posterior capsule) . Bite force was measured by Dental Prescale (FUJI FILM Co, Tokyo, Japan) . Each item was measured before, and 1-, 2-, 3-, and 7-days after the endurance task.<BR>The degree of masticatory muscle pain was significantly higher at 1-day after the endurance task in all subjects. Though it was highest at 1-day after the endurance task in both male and female subjects, only female subjects showed a significant difference (p<0.05) .<BR>In female subjects PPT of deep masseter at 1-day after the endurance task was significantly lower than that before and at 7-days after the endurance task (p<0.05) . In male subjects, on the other hand, there was no significant difference in each site. Hence it was suggested that the patterns of response of the stomatognathic system to the endurance task could differ according to with gender.
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