EFFECTS OF WHOLE-BODY VIBRATIONS ON PLASMA AND URINARY CORTICOSTEROID LEVELS IN MAN.
Rept. for Dec 60-Feb 63,
CHICAGO UNIV ILL MEDICAL SCHOOL
Pagination or Media Count:
The effects on the hypophysio-adrenal and hypophysiothyroid systems of whole-body vibration of the human for three 3-minute exposures separated by l-12 minute rest periods at 1-20 cps were assessed through the determination of plasma 17-hydroxycorticosteroids 17-OH-CS and protein-bound iodine PBI and of urinary adrenal cortex steroids. The levels of vibration were estimated three-minute tolerance values for the various frequencies. Blood and urine samples were collected at corresponding times on the control day and on the experiment day. Plasma 17-OH-CS levels were lower than control values P 0.05 immediately after vibration at 5, 6, and 7 cps and at 5 hours after vibration P 0.01. There was a significant decrease in the urine excretion of the blue tetrazolium reducing steroids at 1, 2, and 3 cps, and in 17-ketogenic steroids at 18, 19, and 20 cps. At 5, 6, and 7 cps there were significant changes in all steroids studies. Serum protein-bound iodine showed no significant differences when compared to control day. Alterations in blood and urine levels of steroids, while of statistical significance, are still considered within normal limits. Author