Pathways Of Heatgain/ Heatloss

Question 1

What are the 4 pathways of heat gain/loss?

Answer 1

Evaporation
Convection
Radiation
Conduction

Question 2

What is evaporation?

Answer 2

Water located on the surface of skin and airways transforms into a gaseous state which absorbs heat and cools body

Question 3

Higher humidity levels = high water vapour pressure =lower evaporative dissipation

Answer 3

Evaporation

Question 4

Armstrong et al. 2000 - Evaporation

Answer 4

15% decrease in water vapour pressure when comparing cycling at (32• 20% humidity) and 32• 70% humidity)

95% evaporation : 80% evaporation

Question 5

Exercising in temperatures similar to the skin of the body …

Answer 5

Minimises the heat transfer from radiation, convection and conduction

Question 6

What is radiation?

Answer 6

Transfer of energy waves omitted by one object and absorbed by another

Question 7

What is an example of radiation?

Answer 7

Solar energy direct from sunlight and radiant heat from the ground

Question 8

What is convection?

Answer 8

Heat exchange occurring between a solid medium and one that moves e.g. between water and air

Question 9

What is conduction?

Answer 9

Occurs when there is physical contact between 2 surfaces and the direction of heat flow is from the warmer to the cooler object

Accounts for less than 2% heat loss in most situations

Question 10

Heat conductivity of the surface or fluid in contact with the body has a major effect on heat change

Answer 10

Conduction