Accession Number : ADA180090

Title :   Heat Intolerance, Heat Exhaustion Monitored: A Case Report.

Descriptive Note : Final rept.,

Corporate Author : ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA

Personal Author(s) : Armstrong,Lawrence E ; Hubbard,Roger W ; Szlyk,Patricia C ; Sils,Ingrid V ; Kraemer,William J

PDF Url : ADA180090

Report Date : 23 Mar 1987

Pagination or Media Count : 19

Abstract : A 32 year-old male (S.H.) monitored during an 8-day heat acclimation (HA) investigation, unexpectedly exhibited heat intolerance and heat exhaustion. Thirteen other males completed HA without indications of either heat intolerance or heat exhaustion. Because S.H. responded normally to HA on days 1 - 4, the intervention of an unknown host factor on days 5- 8 was suggested. S.H.'s heat exhaustion episode (day 8) was apparently forewarned by loss of body weight and increased heart rate, skin temperature (days 5 - 8) and rectal temperature (days 7 - 8) during daily 90 min trials. His symptoms indicated classical salt depletion heat exhaustion, but the calculated salt deficit was mild. Post-heat exhaustion serum enzyme levels were either normal or acutely elevated. Blood beta-endorphin and cortisol levels were 6 times and 2 times greater than control values, respectively. This case report is unique because physiological measurements and blood analyses were performed before, during, and after heat intolerance and heat exhaustion. Keywords: Exercise; Sodium; Potassium; Plasma volume; Sweat; Serum enzymes; Beta-endorphin; Aldosterone; Plasma renin; Cortisol.

Descriptors :   *HEAT STRESS(PHYSIOLOGY), ALDOSTERONE, BLOOD, BLOOD PLASMA, BLOOD VOLUME, BODY TEMPERATURE, BODY WEIGHT, CONTROL, CORTISOL, DEFICIENCIES, DEPLETION, HEART RATE, MEASUREMENT, PHYSIOLOGY, POTASSIUM, RECTUM, RENIN, SALTS, SIGNS AND SYMPTOMS, SKIN(ANATOMY), SODIUM, EXERCISE(PHYSIOLOGY), WEIGHT REDUCTION, FATIGUE(PHYSIOLOGY)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE