[The relation between the time and the fatigue of skeletal muscle ventricle].
It is generally recognized that if skeletal muscle is stimulated corresponding with the heart rate to assist the cardiac performance, the contraction power of the skeletal muscle decreases in a few minutes. It becomes necessary that the skeletal muscle is electrically stimulated in 6-9 weeks to lead into the transformation or that the muscle is laid without working after operation in 6-9 weeks to wait for growing of the collateral vessels. The observation time of the fatigue phenomenon in many studies is, however, short and it is not understandable that the contraction power decreases near to zero although the type I fibers remain. So we studied the relationship between the time and the pressure assist of the skeletal muscle ventricle (SMV). It was concluded that 1) the cause of the power decrease is not only the fatigue but the operative invasion. 2) in our setting, when SMV was stimulated in the ratio of 1:4 or 1:10 to the heart rate, the power recovered within 3 hours. 3) if the initial setting of the drive is light enough, the preconditioning or the vascular delay will be unnecessary and the working transformation or the in situ training will practicable.
Shimasaki
T
T
Second Department of Surgery, Yamagata University School of Medicine, Japan.
Oshikiri
T
T
Uchino
H
H
Washio
M
M
D000818:Animals; D001243:Assisted Circulation; D004285:Dogs; D004558:Electric Stimulation; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D009200:Myocardial Contraction; D005082:Physical Exertion; D013997:Time Factors; D016276:Ventricular Function