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RISS 인기검색어
- 검색키워드
- 저자 : DeCrespigny, Alex J. (검색결과 1 건)
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Metabolism of Rabbit Masseter Muscle Measured with ^31P Magnetic Resonance Spectroscopy
Chang, Chongon,Chew, Will,Alcantara, Moses,McNeill, Charles,DeCrespigny, Alex J.,Miller, Arthur J. Korean Academy of Oral Biology and the UCLA Dental 1997 International Journal of Oral Biology Vol.22 No.1
^31P NMR spectroscopy was used to study the metabolic characteristics of a jaw-closing muscle. The masseter was stimulated electrically to evoke repeated twitches (5 Hz), tetany (50 Hz) and periodic contracions in 15 anesthetized New Zealand adult male rabbits in 22 recording sessions. NMR spectra consisting of 5 peaks related to unbound phosphate were obtained during rest and contraction using a 2×3㎝, double-turn, copper transmit/receive coil while the animal was placed in a small bore Bruker 4.7 Tesla superconducting magnet. Stimulation at frequencies below 20-30 Hz evoked a significant increase in inorganic phosphate (Pi) and a marked decrease in phosphocreatine (PCr); both exhibited a steady state plateau during a three-minute stimulation trial. In contrast, stimulating at frequencies above 20-30 Hz developed a peak change in Pi and PCr that rapidly declined during the three-minute contraction. Electrically stimulating the masseter at 50 Hz while varying the periodicity of the stimulus with train durations of 200 to 800 msec indicated that the Pi and PCr changes switched between that of twitching to tetany with train durations exceeding 200 msec. These findings suggest that Pi/PCr changes demonstrate two types of responses during contraction that relate to the frequency of contraction.
RISS
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