Accession Number : ADA304639

Title :   Medical Consequences in Young Men of Prolonged Physical Stress with Sleep and Energy Deficiency,

Corporate Author : NORWEGIAN DEFENCE RESEARCH ESTABLISHMENT KJELLER

Personal Author(s) : Opstad, Per-Kristian

PDF Url : ADA304639

Report Date : 05 DEC 1995

Pagination or Media Count : 167

Abstract : The medical consequences of sustained military operations have been studied in cadets from the Norwegian Military Academy during military training courses with physical activities day and night combined with lack of sleep and food. The increased catecholamine responses to a standardize exercise, downregulation of Beta-receptors and decreased cAMP responses to adrenaline stimulation indicate an adrenergic desensitization. Conjugated catecholamines increased during prolonged exercise but marginally during short term exercise. The increased catecholamine levels during the course were mainly due to physical exercise, whereas alterations in cortisol and growth hormone were partly reversed by extra food, and extra sleep did not have any major influence. Both testicular and adrenal androgens decreased during the course. The decreased levels of gonadotropins and their increased responses to hypothalamic releasing hormone indicate that the decreased secretion of testicular androgens is due to decreased hypothalamic secretion of releasing hormone. The circadian rhythm of all steroid hormones was extinguished during the course in contrast to the increased amplitude of the circadian rhythm of mental performance. In conclusion, these alterations may affect functions which are the basis for the subjects' mental and physical performance.

Descriptors :   *STRESS(PHYSIOLOGY), *ENERGY, *SLEEP DEPRIVATION, *EXERCISE(PHYSIOLOGY), MILITARY OPERATIONS, MILITARY FACILITIES, HORMONES, STIMULATION(GENERAL), CIRCADIAN RHYTHMS, CAPACITY(QUANTITY), PERFORMANCE(HUMAN), PHYSICAL PROPERTIES, GONADOTROPINS, RESPONSE, DEFICIENCIES, MILITARY TRAINING, COURSES(EDUCATION), CATECHOLAMINES, FOOD, MENTAL ABILITY, SLEEPING BAGS, SYMPATHETIC NERVOUS SYSTEM, SECRETION, GROWTH SUBSTANCES, DESENSITIZING, CADETS, ADRENAL GLANDS, STEROIDS, UNITED STATES MILITARY ACADEMY, ANDROGENS, CORTISOL, EPINEPHRINE, RAPID EYE MOVEMENT IN SLEEP.

Subject Categories : Stress Physiology
      Medicine and Medical Research
      Pharmacology

Distribution Statement : APPROVED FOR PUBLIC RELEASE