Summary
A volumetric microrespirometer was used to investigate chages in the tissue respiration of the adrenals, thyroid and pituitary of rats after a single exhausting physical exercise. The animals were made to run on a treadmill for 90 min, that is, until they showed signs of fatigue.
Oxygen uptake increased in the adrenals hy 39.1% but decreased in the thyroid by 51.9% and in the pituitary by 37.4%. It should be emphasized that the changes were statistically highly significant.
The authors suppose that increased adrenal O2 uptake may have been due to the stimulating influence of ACTH on the respiration processes in the cortex and intensification of oxidative processes in the medulla, and also increased blood supply in the entire organ during physical work.
Diminished consumption of oxygen by the thyroid may have been caused by the inhibitory influence of factors connected with stress (the inhibitory influence of ACTH and corticosteroids, effort sympathicotonia, and increased body temperature).
The decreased respiration of the pituitary is difficult to interpret but may have been caused by diminished blood supply and perhaps also an overheating of the organism.
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Strazyński, W., Romanowski, W. Effect of physical exercise on tissue respiration of endocrine glands. Int. Z. Angew. Physiol. Einschl. Arbeitsphysiol. 26, 290–297 (1968). https://doi.org/10.1007/BF00698305
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DOI: https://doi.org/10.1007/BF00698305