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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(More)
The myosin heavy chain (MHC) content and spatial distribution of the fibers of 11 motor units (MUs) of the rabbit masseter muscle were determined. The fibers of single MUs were visualized in whole-muscle serial sections by a negative periodic acid/Schiff reaction for glycogen after they had been depleted of glycogen by extracellular stimulation of their(More)
Rabbit masseter motor units (22) were studied by stimulation of trigeminal motoneurons. We tested the hypotheses that masseter motor units facilitate fine motor control by concentrating fibers in small areas and that the distribution of motor unit fibers depends on the fiber type. The twitch contraction time and the isometric tetanic force were registered.(More)
Trigeminal motoneurons were electrically stimulated in order to investigate the electromyographic (EMG) behavior in relation to the contractile properties of motor units of the masseter muscle. A total of 80 motor units were studied in situ in male New Zealand White rabbits ( n=46). The motor units were separated into two groups, each exposed to a specific(More)
Force-frequency curves of rabbit masseter motor units ( n=20) were determined, in order to study the capacity of these motor units for rate gradation and to establish the relationship between twitch contraction time (TCT) and the shape of the curves. Motor unit force responses were elicited by stimulating motoneurons in the trigeminal motor nucleus(More)
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