ENVIRONMENTAL CON. - HEAT 1
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Different environmental conditions to consider include the following name all 3?
-Temperature - Hot/cold -Humidity - Wet/dry -Altitude /sea level
Heat loss from the body occurs in 4 different ways name them
-Conduction -Convection -Radiation -Evaporation
Define Conduction
When heat is exchanged by 2 objects in contact with each other
Define Convection
When heat is exchanged with/by a fluid that is flowing
Define Radiation
Occurs when heat is transferred from a warmer body to the cooler surroundings without physical contact
Define Evaporation
Is the cooling of the body as a result of the vaporisation of sweat
Which method is most effective in dry conditions
Evaporation
As humidity increases?
Evaporation becomes less effective
The rate of sweating is dependent on what factors
-Gender (male more than female) -Number of sweat glands -Body surface area (↑SA = ↑ sweat) -How fit you are (↑fitness = ↑ sweat if all other factors are equal, e.g., body SA)
If there is 100% Humidity what and why cant something happen resulting in what
Evaporation As the sweat cannot evaporate of skin that is saturated by the humidity Resulting in core temp rising
Dehydration becomes a problem due to?
A large volume of fluid being lost
Excessive sweating leads to a loss of body fluids, which results in what
The core temp rising
Sweat loss can reach how much % of body mass Less than 2% means?
6-10% Means performance and thermoregulation are comprimised
The body’s preferred mechanism of heat loss is dependent upon the following 3 factors name them
• Environment • Age • Physiological State
If Ambient temp is above the core temp what is the only method of heat loss
Evaporation
If its windy what will occur in 1. Environment
Forced Convection
Explain why children dont sweat as much
Their sweat glands are not developed as much as adults are
a reduction in plasma volume leads to a what?
Decrease in sweat rate