Heat Intolerance, Heat Exhaustion Monitored: A Case Report

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 -...

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Bibliographic Details
Main Authors: Armstrong,Lawrence E, Hubbard,Roger W, Szlyk,Patricia C, Sils,Ingrid V, Kraemer,William J
Format: Report
Language:English
Subjects:
ALDOSTERONE
Aldosterones
AS879
BLOOD
BLOOD PLASMA
BLOOD VOLUME
BODY TEMPERATURE
BODY WEIGHT
CONTROL
CORTISOL
DEFICIENCIES
DEPLETION
Endorphins
EXERCISE(PHYSIOLOGY)
FATIGUE(PHYSIOLOGY)
HEART RATE
HEAT STRESS(PHYSIOLOGY)
MEASUREMENT
PE62777A
PHYSIOLOGY
POTASSIUM
RECTUM
RENIN
SALTS
SIGNS AND SYMPTOMS
SKIN(ANATOMY)
SODIUM
Stress Physiology
WEIGHT REDUCTION
WU122
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Summary: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.