Age-Related Changes in Oxygen Consumption and the SDH Activity of Liver Homogenate of Male Garden Lizards: Effect of Malonate and Short-Term Cold Stress

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Abstract
The respiratory rate of liver homogenate in the male garden lizard showed a decline with advancing age. The mitochondrial marker enzyme, SDH of the liver, reached a peak activity in the middle-aged group and then declined. Malonate inhibition of the enzyme activity was greater in young and middle-aged groups of lizards than in old. Short-term cold stress (1 h at 0–4 °C) showed a differential age effect inducing a decline in enzyme activity of the middle-aged group and a rise in the old.