PMID: 7539059Feb 1, 1995Paper

Contraction characteristics and myosin heavy chain composition of rabbit masseter motor units

Journal of Neurophysiology
S H KwaP J Jüch

Abstract

1. We studied isometric twitch peak force (TPF) and twitch contraction time (TCT) of 249 motor units of the masseter muscle in 41 rabbits after extracellular electrical stimulation of single trigeminal motoneurons in the brain stem. In 41 of these units we determined the amount of tension decrease during a partially fused tetanus (sag) and the ratio between peak tetanic force after 2 min of intermittent tetanic stimulation and initial tension (fatigue index). Muscle fibers of 24 motor units were identified by the glycogen depletion method and characterized in serial sections with monoclonal antibodies against type IID, IIA, "cardiac" alpha, and I isoforms of myosin heavy chain (MHC). 2. The motor units had TCTs ranging from 13 to 32 ms. The majority of the units showed forces < 35 mN. The TPFs were larger and varied more for motor units with short and intermediate TCTs than for units with long TCTs. There is a small but statistically significant negative correlation between the motor unit TPF and the TCT. 3. All units exhibited "sag" and, with the exeption of one, had fatigue indexes > 0.75. The studied rabbit masseter motor units can therefore be classified as fast, fatigue-resistant, except for one that belonged to the FF (fa...Continue Reading

Citations

Oct 24, 1998·Journal of Dental Research·S J TurkawskiW A Weijs
Apr 14, 1999·Journal of Neurophysiology·A J FuglevandB Bigland-Ritchie
Jun 16, 1999·Journal of Neurophysiology·J S CarpJ R Wolpaw
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