Thermoregulation and Heat Stress

Question 1

Describe energy release

Answer 1

75-100% of energy release is as heat, internally and must be offloaded to sustain exercise and prevent inevitability

Question 2

Describe complexity of heat stress

Answer 2

Involves many other systems (metabolism, immune, endotoxicity, CNS

Question 3

Multiple demands of exercise

Answer 3

Maintain arterial pressure and adequate blood supply to vital tissues
Offload heat to prevent hypothermia
CVS must meet these demands

Question 4

Evaporating ____ H2O removes ____ heat

Answer 4

1g - 2.43 kJ

Question 5

How many eccrine sweat glands to humans have

Answer 5

2.5-4 million glands

Question 6

Max gastric emptying

Answer 6

~1-1.2 L/Hr

Question 7

Why is dehydration common during exercise in the heat

Answer 7

High output is 1.5-3.7 L/Hr, but max gastric emptying is ~1-1.2 L/Hr (cant keep up even if drinking at ma rate that GI can handle)

Question 8

Skin thermosensivity

Answer 8

Face dominates (behavioural and physiological)
Hands and feet are high for conscious perception and behavioural response

Question 9

What happens to exercise in warm or humid environments

Answer 9

Endurance and high intensity exercise is impaired - bigger decrease if lower fitness (less fit people slow down very early, low airflow penalizes fit people more)