Energy metabolism and gas exchange during treadmill running in dogs

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Abstract
The energy cost of treadmill running was studied in six dogs at grades of 0, 4, 8, 12, 16, 19 and 22 degrees of inclination. The relationship between caloric expenditure and grade is significant. A product-moment coefficient of correlation of +0.978 was found. A product-moment coefficient correlation of +0.941 was found between work pulse rate and caloric expenditure. Climbing efficiency showed a maximum of 28% and decreased at the lowest and highest grades. Respiratory efficiencies were highest during resting conditions. Maximum O2 uptake increased with age to a peak value of 136 cc/kg/min. at 1 year of age. Maximum 24-minute recovery O2 debts of 4–6 liters were measured following exhaustive running. The data form a basic standardization background for application of the treadmill as a device for studies of controlled work output in the dog. Submitted on September 17, 1958

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