Energy metabolism of the albino rat at minimal levels of spontaneous muscular activity.

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Abstract
Quantitation and analysis by original technique of recorded O2 consumption and spontaneous muscular activity (SMA in arbitrary units) in normal rats showed the following: 1) Least observed metabolic rate (LOMR, i.e., lowest VO2 when SMA = 1.0 u), detected 50 times in 119 experiments yielded the allometric relationship: LOMR = 10.77 (weight).62 [plus or minus] 4%. 2) In 48% of 1,019 10-min. observed periods, the value of SMA was 1.0, 1.1, or 1.2 units. These "microactivities" corresponded to a mean VO2 value defined minimal observed metabolic rate (MOMR). VO2 differences among the 3 levels of minimal activity were not significant; however, MOMR was statistically different from LOMR ([DELTA] = 5%; P < .001). 3) At each level of activity (up to 2.9 units), VO2/W.6 = ki, i.e., VO2 per unit of "standard body size" (SBS) could be represented by a series of constants of increasing value, from 10.47 for LOMR to 15.54 for SMA - 2.9 units. 4) Oxygen consumption per unit of SBS, calculated as a function of SMA, yielded the equation VO2/W.6= 8.26 [plus or minus] 2.33 (SMA) [plus or minus] 0.17. 5) It is proposed to utilize the frequently found MOMR in lieu of the rare LOMR as a precisely defined index of the resting metabolic rate of the rat.

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