PMID: 7014216Jan 1, 1981Paper

The effect of a high calory diet on hormonal changes in young men during prolonged physical strain and sleep deprivation

European Journal of Applied Physiology and Occupational Physiology
P K Opstad, A Aakvaag

Abstract

Major changes occur in the serum level of several hormones during 5 days of heavy and continuous physical activities, with less than a total of 2 h of sleep. The present investigation was designed to evaluate the importance of caloric deficiency, energy requirement being about 8,000-10,000 kcal/24 h. A comparison between well fed subjects and those with food deprivation revealed significantly higher levels of (T3) triiodothyronin, insulin and thyroid stimulating hormone (TSH) in the well-fed subjects, who also had lower levels of growth hormone (hGH) and cortisol, whereas no difference was found between the two groups for thyroxin (T4). Increased levels were found for T3 and T4 in both groups during the first day of activity, with a concomitant decrease in TSH and a subsequent decrease of T4 during the next 2 days. T3 decreased only in the low-calory group whereas increased levels were found in the iso-calory group throughout the course. The resting levels of insulin decreased during the course in the low-calory group whereas it increased in the iso-calory group. High levels were maintained throughout the course for hGH. Cortisol showed high levels just before the start of the course and then decreased from day 2 to day 4. No d...Continue Reading

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Citations

Jan 1, 1996·European Journal of Applied Physiology and Occupational Physiology·H C GungaK Kirsch
Jan 1, 1980·European Journal of Applied Physiology and Occupational Physiology·P K OpstadT O Rognum
Jan 1, 1990·European Journal of Applied Physiology and Occupational Physiology·J KnapikJ Vogel
Jan 1, 1983·European Journal of Applied Physiology and Occupational Physiology·P K Opstad, A Aakvaag
Feb 1, 1997·Journal of the American Dietetic Association·M M GottschlichG D Warden
Nov 1, 1992·European Journal of Clinical Investigation·Y IlanP Lavie
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May 8, 2000·Journal of Applied Physiology·K E FriedlE W Askew
Jul 24, 2020·Medicine and Science in Sports and Exercise·Thomas J O'LearyJulie P Greeves

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