REDUCED SET POINT TEMPERATURE IN EXERCISING DOG
Abstract
Experiments were performed on dogs to test the hypothesis of an elevated set point temperature in exercise. Measurements of rectal, hypothalamic, and skin temperatures and respiratory evaporative heat loss were made on dogs at rest and during exercise on a level treadmill at 4 mph. Local hypothalamic heating and cooling during exercise, using surgically implanted thermodes, were performed on two dogs to confirm the temperature sensitivity of the hypothalamus of the exercising dog. Comparisons of evaporative heat loss during rest and exercise revealed much greater loss during exercise than at rest at the same hypothalamic temperature. In experiments at low ambient temperatures, between 10 degrees C and 17 degrees C, internal body temperatures were often the same or lower during exercise than during the preceding rest period, although panting and vasodilatation were observed during exercise in contrast to shivering and va/oconstriction during the rest period. These observations lead to the conclusion that the set point temperature in trained, exercising dogs is lowered from the resting level.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1963
- Accession Number
- AD0424541
Entities
People
- Donald C. Jackson
- Harold T. Hammel