L18, Exercise in the heat 2

Question 1

At what core temperature does exhaustion occur due to heat intolerance?

Answer 1

38 degrees (possibly higher if a good athlete).

Question 2

What are three forms of cardiovascular strain caused by heat stress?

Answer 2

Decrease in blood pressure, decrease in blood flow to several tissues and organs, decrease blood flow to skin muscle and brain (increased HR also causes a decrease in VO2 max).

Question 3

What psychophysical strain is caused by heat stress?

Answer 3

Increased perceived exertion.

Question 4

What metabolic strain is caused by heat stress?

Answer 4

Muscle glycogen depletion.

Question 5

What are the four main personal factors governing performance in the heat?

Answer 5

Aerobic fitness (beneficial), heat acclimatisation (beneficial), initial physiological status (e.g. hydration, metabolism, illness etc.), hydration (low body water impairs CV function, sweat production, cognition).

Question 6

What causes heat exhaustion?

Answer 6

Homeostatic capacity exceeded.

Question 7

What causes exertional heat stroke?

Answer 7

Major cellular disturbances mainly due to a large increase in temperature and immune disturbances caused by illness.

Question 8

What are 5 ways decrease heat strain and increase performance.

Answer 8

Increase aerobic fitness and heat acclimatisation, decrease clothing and carried weight,