Abstract

A biochemical analysis was made of blood samples taken from dogs (aged 6-9 months, 2-5 years, and over 8 years) before physical exertion, during running on a treadmill (ii kin/h), and in the period after work. It was found that dynamic loading induced an increase in the blood concentration of ll-hydroxycortieosteroids (II-HCS), adrenalin-like substances, sugar, and lactic acid in the dogs aged 2-5 years, but a decrease in the II-HCS concentration, delay in the liberation of adrenalin-like substances, and hypoglycemia in the older dogs. The young dogs occupied an intermediate position between the old and middle-aged animals.

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