Exercise In The Heat

Question 1

Thermoregulation

Answer 1

The body trying to regulate it’s heat at approximately 37 degrees +/- 1 degree

Equilibrium of temperature

Question 2

How does the Hypothalamus know to regulate heat?

Answer 2

Receives information from the Thermoreceptors in the blood and the skin

Question 3

What does the hypothalamus control?

Answer 3

Vasoconstriction/dilation of smooth muscle

Sweat glands evaporation

Erector Pili muscles - control skin hairs

Skeletal muscle shivering

Adrenal gland increase metabolic rate

Question 4

Cooling methods…

Answer 4

Conduction -> ice pack

Convection air light clothing

Evaporation

Radiation -> infra-red rays to other objects

Question 5

Cardiovascular drift

Answer 5

An increase in HR despite working at the same intensity

Question 6

When does cardiovascular drift usually occur?

Answer 6

After 20 minutes

Question 7

Why does this occur?

Answer 7

As athletes sweat as a result of using Aerobic energy there is a loss of fluid

This leads to a plasma loss this increases blood viscosity

That increase in blood viscosity leads to an increase of resistance to blood flow

This will slow down SV (cause less)

If Q stays the same and SV goes down then for Q to stay the same HR has to increase as

Q= SV x HR

Question 8

What do hot conditions do to cardiovascular drift?

Answer 8

Exaggerate the situation, as sweating will occur more regularly and faster

Question 9

Strategy to minimise CV drift.

Answer 9

rehydration