Influence of motor mode on the formation of blood stroke volume in rats

We investigated blood stroke volume (BV) in growing rats during an abrupt transition from systematic muscle training to hypokinesia, as well as from limited motor activity at early age to subsequent muscular exertion. In the experiments we used white mongrel rats, which had different regimen of motor activity from the age of 14 days. In the 1st group animals were provided with unrestricted motor activity; in the 2nd group, after 4 weeks of swimming training they were sharply restricted in their motor activity for 4 weeks; in the 3rd group, after hypokinesia for 4 weeks the rats were gradually started to be trained. Blood stroke volume was determined by tetrapolar thoracic rheography using Kubitschek's formula.