Figure 4-5. Heat transfer mechanisms.
Section IV. FACTORS AFFECTING HEAT INJURIES
The general physical condition of the individual has a significant bearing on a
person's reaction to heat. A large number of conditions affect an individual's ability to
withstand heat. These conditions include:
a. Infections. Acute and chronic infections including the convalescent state.
b. Febrile Conditions. The body temperature of a person with a fever is
already above normal. Less heat is required to cause him to suffer from heat injury than
if his temperature was normal.
c. Immunizations (Reactions). Reactions to immunizations have been
correlated with an increase in heat injuries, possibly caused by an associated fever.
d. Vascular Diseases. An individual with poor blood circulation such as
someone suffering from a peripheral arterial disease with its decreased blood flow is
more susceptible to heat injury.
e. Diarrhea. Abnormally frequent passages of loose stools constitute this
f. Conditions Affecting Sweat Secretion. For example, skin diseases which
affect sweating affect ability to withstand heat.