Effects of muscle vibration on position perception during jaw opening and closing movements.
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概要
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Roles of afferents from muscle spindles in jaw-closing muscles and infrahyoid muscles on the jaw position during opening and closing movements were studied in healthy human subjects. Vibration was applied to the tendon of those muscles to activate muscle spindles. Two series of experiments were performed. In the first series, the subjects performed slow jaw-opening and -closing movements (<l0mm/s) to an instructed end position without visual feedback. When vibration was applied to the tendon of the masseter muscle during opening-movements, all the subjects significantly overestimated the end position compared with the control (p<0.001) .When vibration was applied during closing movements, two of five subjects significantly overestimated the final end position (p<0.01), but the remaining three showed no difference from the control. Furthermore when vibration was applied to the tendon of masseter muscle during moderately fast jaw movements, eight of ten subjects significantly overestimated the final end position (p<0.05) . In the second series, vibration was applied to the tendon of the infrahyoid muscle during slow jaw movements to an instructed end position without visual feedback. When vibration was applied during closing movements, all the subjects significantly overestimated the final end positon (p<0.05) . It is suggested that the afferent information from the masseter muscle and infrahyoid muscle are mainly available to the jaw-opening and -closing movements, respectively.
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