Repeatability of energy expenditure measurements in clinically normal dogs by use of indirect calorimetry

Lisa M. Walters From the Comparative Oncology Unit, Departments of Clinical Sciences (Walters, Ogilvie, Salman, Joy, Wheeler) and Pathology (Fettman), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, and Mark Morris Associates (Hand), PO Box 1493, Topeka, KS 66601.

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Gregory K. Ogilvie From the Comparative Oncology Unit, Departments of Clinical Sciences (Walters, Ogilvie, Salman, Joy, Wheeler) and Pathology (Fettman), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, and Mark Morris Associates (Hand), PO Box 1493, Topeka, KS 66601.

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Mowafak D. Salman From the Comparative Oncology Unit, Departments of Clinical Sciences (Walters, Ogilvie, Salman, Joy, Wheeler) and Pathology (Fettman), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, and Mark Morris Associates (Hand), PO Box 1493, Topeka, KS 66601.

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Linda Joy From the Comparative Oncology Unit, Departments of Clinical Sciences (Walters, Ogilvie, Salman, Joy, Wheeler) and Pathology (Fettman), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, and Mark Morris Associates (Hand), PO Box 1493, Topeka, KS 66601.

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Martin J. Fettman From the Comparative Oncology Unit, Departments of Clinical Sciences (Walters, Ogilvie, Salman, Joy, Wheeler) and Pathology (Fettman), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, and Mark Morris Associates (Hand), PO Box 1493, Topeka, KS 66601.

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Michael S. Hand From the Comparative Oncology Unit, Departments of Clinical Sciences (Walters, Ogilvie, Salman, Joy, Wheeler) and Pathology (Fettman), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, and Mark Morris Associates (Hand), PO Box 1493, Topeka, KS 66601.

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Steven L. Wheeler From the Comparative Oncology Unit, Departments of Clinical Sciences (Walters, Ogilvie, Salman, Joy, Wheeler) and Pathology (Fettman), College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, and Mark Morris Associates (Hand), PO Box 1493, Topeka, KS 66601.

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Summary

Energy expenditure (ee) was determined, using an open-flow indirect calorimetry system in a group of 20 clinically normal, apparently resting, client-owned dogs. Five evaluations were performed over an 8-hour period to determine reliability of the method. The intraclass correlation coefficient was calculated as the ratio of within- and between-subject variances, using repeated-measures anova. When only the middle 3 evaluations were included, the intraclass correlation coefficient was 0.87, indicating good reliability. The first evaluation was higher than the subsequent 4 evaluations for rate of O2 consumption (Vo2/kg and Vo2/kg0.75; (P ≤ 0.01), and ee/kg and ee/kg0.75 (P ≤ 0.005). The respiratory quotients at the first (P = 0.004) and second (P = 0.013) evaluations were different from the respiratory quotient at the fourth evaluation. Therefore, the first evaluation may not be representative of the actual ee. The mean value of at least 3 subsequent evaluations after an adequate adaptation period (5 to 10 minutes) to the equipment will be useful for predicting energy requirements of apparently resting, clinically normal dogs.

Summary

Energy expenditure (ee) was determined, using an open-flow indirect calorimetry system in a group of 20 clinically normal, apparently resting, client-owned dogs. Five evaluations were performed over an 8-hour period to determine reliability of the method. The intraclass correlation coefficient was calculated as the ratio of within- and between-subject variances, using repeated-measures anova. When only the middle 3 evaluations were included, the intraclass correlation coefficient was 0.87, indicating good reliability. The first evaluation was higher than the subsequent 4 evaluations for rate of O2 consumption (Vo2/kg and Vo2/kg0.75; (P ≤ 0.01), and ee/kg and ee/kg0.75 (P ≤ 0.005). The respiratory quotients at the first (P = 0.004) and second (P = 0.013) evaluations were different from the respiratory quotient at the fourth evaluation. Therefore, the first evaluation may not be representative of the actual ee. The mean value of at least 3 subsequent evaluations after an adequate adaptation period (5 to 10 minutes) to the equipment will be useful for predicting energy requirements of apparently resting, clinically normal dogs.

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