Cardiovascular responses to exercise and hyperthermia

What are the three branches of impaired exercise performance in the heat?

central nervous system dysfunction, cardiovascular dysfunction, accelerated muscle fatigue

Define radiation

infrared rays, transfer of heat from one surface to another without contact

Define conduction

heat transfer from body to molecules of cooler objects in contact with its surface

Define convection

heat transmitted to either air or water molecules in contact with the body

Define evaporation

Heat from transferred from the body to water on the surface of the skin

What are the factors that affect evaporation?

ambient conditions, convective air currents, amount of skin surface exposed

What are the two factors that concern ambient conditions?

air temperature and relative humidity

What is the most important factor in regards to evaporation?

relative humidity

Define specific heat

The amount of heat energy required to increase 1kg of body tissue by 1 degree celsius

What is the specific heat in humans?

0.83 kcal/kg

How can we increase human body temperature by 1 degree?

Specific heat x body mass

What is the body’s internal thermometer called?

The preoptic-anterior hypothalamus (POAH)