کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9415816 | 1614323 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Circadian variation and intermuscular correlation of rabbit jaw muscle activity
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
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چکیده انگلیسی
The activation of jaw muscles varies with different tasks and must be coordinated to ensure proper function of the masticatory system. The activation patterns might differ in various muscles or over the time course. In order to evaluate the activation patterns and the intermuscular correlation during normal daily activity the electromyograms (EMG) of the superficial and deep masseter, medial pterygoid and digastric muscles were continuously recorded in rabbits and related to activity levels. Muscle use was assessed as the relative time per hour (duty time) during which predefined levels of the peak-EMG of the day were exceeded. Pearson's correlation of duty times was calculated for 6 muscle pairs at various activity levels. The duty times of the muscles differed significantly at levels exceeding 50% of the peak-EMG. The animals exhibited apparent intraday variations of duty times revealing a circadian covariant pattern of muscle use. These variations, however, were different in each individual animal. The activation of pairs of jaw-closing muscles was more highly correlated than that of pairs consisting of a jaw-closing and a jaw-opening muscle. The mutual dependence of hourly muscle activity among jaw-closers and among jaw-closers and jaw-openers varied with the activity level suggesting that those muscle groups might be independently controlled during non-powerful and powerful motor behaviors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Brain Research - Volume 1062, Issues 1â2, 16 November 2005, Pages 151-160
Journal: Brain Research - Volume 1062, Issues 1â2, 16 November 2005, Pages 151-160
نویسندگان
Thorsten Grünheid, Geerling E.J. Langenbach, Andrej Zentner, Theo M.G.J. van Eijden,