THYROID FUNCTION IN EXERCISED RATS
Abstract
The possibility that the increased metabolic rate produced by exercise (running on a revolving drum) and exercise superimposed upon long-term cold exposure (5 C) results in a consequent increased thyroid secretion rate of rats as indicated by biologic decays has been investigated. Two levels of exercise were used 1-2 hours per day and 4-6 hours per day. Both these levels of activity depressed caloric intake and weight gain but appeared to be insufficient to bring about increased energy output. Initiation of exercise did not bring about significant changes in the biologic decay rates. After exercise of longer duration the biologic half-times tended to be decreased but the difference was not significant at the 5% level from that for the unexercised rats. A relationship between food intake and the biologic decay rates was observed. Rats which ate less due to the limitations imposed by the feeding regime had longer biologic halftimes of I131 than those rats which had a greater caloric intake. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1961
- Accession Number
- AD0275862
Entities
People
- Merva Cottle