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Thermoregulation

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Increases in heat production-Shivering and increased voluntary activity ... ACSM Recommendations. Above 82 degrees-very high risk-postpone ... – PowerPoint PPT presentation

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Title: Thermoregulation


1
Thermoregulation
  • Thermal Balance
  • Hypothalamus
  • Heat Stress
  • Cold Stress

2
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3
Mechanism for Temperature Regulation -Cold
  • Decreases heat loss-vasoconstriction
  • Increases in heat production-Shivering and
    increased voluntary activity
  • Increased thyroxin and epinephrine secretion

4
Mechanism for Temperature Regulation-Heat
  • Increased heat loss-Vasodilatation
  • Decreases heat production-Decreased muscle tone
    and voluntary activity
  • Decreased secretion of thyroxin and epinephrine

5
Heat Loss
  • Radiation
  • Conduction
  • Convection
  • Evaporation

6
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8
Complications
  • Heat Cramps-Spasms in exercising muscles
  • Heat Exhaustion-weak and rapid pulse,low
    BP,HA,dizzy,weakness
  • Heat Stroke-excessive core temp,no sweat,altered
    mental status,life threatening

9
ACSM Recommendations
  • Above 82 degrees-very high risk-postpone
  • 73-82 degrees-high risk-Heat sensitive
    individuals should not compete
  • 65-73 degrees-mod risk
  • Below 65-low risk

10
Exercising -Heat
  • Vascular adjustments-Blood flow to skin
    increases,compromising blood to working muscles
    and other vital organs
  • SV decreases,AC and CO also decrease because of
    fluid deficit
  • Attempts to maintain BP
  • Core Temp Increases

11
Water
  • Fluid loss .5-1.0 L for mod exercise in 1 hour
  • 3 L loss for intense exercise
  • Must constantly replenish fluids.Must exceed
    25-50 above sweat loss(urine loss)
  • Water replacement is more important than mineral
    replacement
  • Electrolyte replacement and water is optimal

12
Clothing-Warm Weather
  • Cotton or linen
  • Light colors
  • Changing into a dry shirt from a wet one while
    exercising will negatively affects the cooling
    process

13
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14
Exercising in the Cold
  • Peripheral vasoconstriction can lead to tingling
    and numbness
  • Burning sensation in nose and ears
  • Tissue damage-Frostbite
  • Surgical removal of damaged tissue

15
Cold Weather-Clothing
  • Numerous layers is better than a single bulky
    layer
  • Moisture must be allowed to pass to outer layers
  • Wools and synthetics insulate and dry fast
  • Wear a hat(30-40 Heat loss by Head)
  • Wet clothing loses 90 of its insulating
    properties
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