Abstract
A study was carried out of the characteristics of oxygen consumption at different age periods in rats kept in a respiratory chamber at a temperature corresponding to that in their natural habitat. The experiments were carried out on 407 animals. In albino rats the oxygen consumption increases after birth both per unit of weight and per unit of body surface, reaching the maximum at the time of assuming the standing posture (11th–17th day after birth) −104.6 ml/kg weight and 323.6 ml/m2 body surface per minute. During subsequent postnatal development oxygen consumption both per unit of weight and per unit of body surface gradually decreases. At the same time, a progressive decrease in oxygen consumption occurs per unit of body weight up to the adult period, reaching 35.0 ml/kg per min. The oxygen consumption per unit of body surface falls only until one month of age, after which it increases again. It is concluded that change in oxygen consumption reflecting the energy expenditure rate in the postnatal ontogenetic process does not conform to the “surface energy rule”.
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