Energetics of Muscle Activity in Relation to the Molecular Physiology of the Contraction Process

摘要

The first measurements of heat production of isolated papillary muscles have been accomplished due in large part to the development of very short, high sensitivity piles, whose geometry have been adapted for this tissue. Resting heat rate has been found to be ten times that of skeletal muscle. At 20 degrees C. and at resting length its value is 24.8 mcal/g. muscle x min. The relation between heat production and actually developed tension is similar to that of skeletal muscle. An extra amount of heat is produced when the muscle is allowed to shorten. Preliminary results indicate that the rate of heat production in stimulated muscle is much slower than in skeletal muscles. (Author)