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It has recently been postulated that diaphragm fatigue may be due, at least in part, to a form of low-grade injury to subcellular organelles. Moreover, several studies have shown that thiol-containing compounds can protect cardiac and striated skeletal muscle organelles from the deleterious effects of a number of physiological stresses. The purpose of the(More)
Despite the wealth of information about the neural control of pharyngeal dilator muscles, little is known about their intrinsic physiological properties. In the present study the in situ isometric contractility and endurance of a pharyngeal dilator, the geniohyoid muscle, were compared with properties of the diaphragm in 12 anesthetized artificially(More)
Despite a wealth of information about the respiratory behavior of pharyngeal dilator muscles such as the genioglossus, sternohyoid, and sternothyroid muscles, little is known about their contractile and endurance properties. Strips of these muscles (as well as of the diaphragm) were surgically removed from anesthetized cats and studied in vitro at 37(More)
K(+) channels regulate diaphragm resting membrane potential and action potential duration, and hence force. Certain blockers of these channels, e.g. tetraethylammonium (TEA), increase twitch force of normal diaphragm. To further address whether these agents may be useful in the treatment of diaphragm weakness, studies examined the effects of TEA on force of(More)
K(+) channel blockers, such as tetraethylammonium (TEA) and 4-aminopyridine, increase force of normal skeletal muscle. To determine whether they also increase force of diseased muscle, effects of TEA were examined on limb muscles of dy/dy dystrophic mice in vitro. TEA significantly increased isometric twitch force of normal and dystrophic soleus muscle by(More)
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