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Metabolic rates (MR) of desert hamsters measured as oxygen consumption overnight. Note the high values during activity at night and the rapid fall of MR during torpor entry late at night or early in the morning. Torpor duration and depth decreased with age and increasing size. Gaps in the data points show baseline readings of the respirometry system every 3 h. Horizontal dotted lines show 75% of the resting metabolic rate measured at Ta 22°C.
