Chemical composition of skeletal muscle

Task-specific design of skeletal muscle: balancing muscle structural composition.

Skeletal muscle fibers are composed of three structural elements, each contributing a unique aspect of muscle function, yet each 'competing' in a sense for space inside the cell. The volume occupied by myofibrils determines the force of contraction, the volume of sarcoplasmic reticulum sets the rate of onset and relaxation of a fiber's contraction and hence contraction frequency, and the volume...

Chemical changes in skeletal muscle during development.

Structure and composition of tubular aggregates of skeletal muscle fibres.

Unusual regions of densely packed membranous tubules known as tubular aggregates (TAs) have been observed in skeletal muscle fibres of mammals under numerous pathological conditions but also in health. Their causality is unclear. It is neither known whether TAs are destructive and should be treated or whether they have a compensating function in an endangered muscle. In spite of many similariti...

Effect of long-term exercise on skeletal muscle lipid composition.

MORGAN, THOMAS E., FLOYD A. SHORT, AND LEONARD A. COBB. Effect uf hg-term exercise on skeletal muscle lipid compusihon. Am. J. Physiol. 216(l): 82-86. 1969.-The effect of 4-6 weeks unilateral isotonic quadriceps exercise on concentrations of total phospholipid, phosphatidyl choline, cholesterol, and triglyceride was studied in the trained and contralateral untrained vastus lateralis of 10 norma...

Gene polymorphisms and fiber-type composition of human skeletal muscle.

The ability to perform aerobic or anaerobic exercise varies widely among individuals, partially depending on their muscle-fiber composition. Variability in the proportion of skeletal-muscle fiber types may also explain marked differences in aspects of certain chronic disease states including obesity, insulin resistance, and hypertension. In untrained individuals, the proportion of slow-twitch (...