ENVIRONMENTAL CONDITIONS - HEAT 2
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Define Double heat load
Is when the body is forced to deal with 2 types of heat affecting the body for example, Metabolic and Environmental
Define Cardiovascular drift (cardiac drift)
Is when the heart rate maintain the cardiac output because there is a decrease in the stroke volume output
Define Dehydration
When the amount of fluid being lost is greater than the amount of fluid being taken in
We lose water by 3 ways name them?
• Urinating • Sweating • Breathing
Muscles and vital organs require blood flow to
Sustain energy metabolism
How does the blood keep the core temp cool?
Sends the the blood flow to the environment
However this blood sent to the environment cannot do what?
Send blood to the working muscles and affecting performance
When exercising in the heat, the body directs blood flow to the what? and away from the what? to increase what?
Skin Working muscles Heat loss via evap
A reduction in blood flow to the working muscles increases the production and build up of what?
Lactic Acid
Reducing blood flow to the skin reduces the what? inhibiting the body’s ability to what? this then leads to what?
Sweat Rate Lose heat via evaporation rise in core temp which negatively impacts the core temp
Heat-related injuries are progressive – they occur in a particular order list them in order?
Stage 1: Dehydration Stage 2: Heat Exhaustion Stage 3: Heat Stroke
Name Stage 1 in Heat-related injuries and explain it
Stage 1: Dehydration Is when the amount of fluid lost is greater than the amount of fluid being taken in.
Name Stage 2 in Heat-related injuries and explain it
Stage 2: Heat Exhaustion Occurs when the athlete continuous to keep exercising even when they are losing more fluid they can replace, they risk moving into stage 3
Name Stage 3 in Heat-related injuries and explain it What can it cause
Stage 3: Heat Stroke When the body stops sweating as it cannot do this anymore, the core temp is rising to dangerous or life-threatening levels, because of lack of evaporating cooling. Cause Hyperthermia
Define Hyperthermia
Hyperthermia is elevated body temperature above 38 Degrees due to failed thermoregulation that occurs when the body produces or absorbs more heat than it dissipates.
The skin blood vessels will what? (increase diameter), so more what?
Vasodilate More blood flows to the skin
Fluid replacement strategies to minimise dehydration: Pre exercise
• Drink 1L before • 600mL 3-4 hours before the comp • 400mL just before the comp to prime the stomach
Fluid replacement strategies to minimise dehydration: During exercise
Drink around 20mL every 15 mins
Fluid replacement strategies to minimise dehydration: Post exercise
• For every 1L lost drink 1.5L (as you will urinate some out)
What is Hyponatremia
When there is an abnormally low concentration in sodium levels in the body
What do sports drink contain in it
Contain carbohydrates, sodium and potassium
List 4 reasons why sports drinks are effective
• Taste good, athlete will drink more • Provide athletes with a rapid supply of energy (high GI) and assist in glycogen sparing • Replace lost electrolytes • Rehydrate the performer