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SEHS: Option A: A2 cont’d Environmental factors part II.

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Presentation on theme: "SEHS: Option A: A2 cont’d Environmental factors part II."— Presentation transcript:

1 SEHS: Option A: A2 cont’d Environmental factors part II

2 Describe how an athlete should acclimatize to heat stress What is acclimatization? It is the process in which an individual organism adjusts to a gradual change in its environment (such as a change in temperature, humidity, photoperiod, or pH), allowing it to maintain performance across a range of environmental conditions. For heat stressors – Perform training sessions in similar environmental conditions (heat and humidity) for 5-10 days results in almost total body adjustments (go slow to start though)

3 Signs of acclimatization to heat during sub- maximal : Physiological, metabolic and psychological adaptations that occur with heat acclimmatization Lower heart rate Lower core temperature Increased plasma volume Earlier onset of sweating (at a lower temp) More dilute sweat (less electrolyte loss) Reduce rate of muscle glycogen use Decreased psychological effect of effort

4 Outline the principle means by which the body maintains core temperature in cold environments Non-shivering thermogenesis (BAT)

5 Explain why the body surface area-to-body maintains core temperature in cold environments Larger individuals/athletes have less surface area compared to volume (lower surface area to volume ratios) than smaller individuals/athletes (higher s.a.: vol)

6 Outline the importance of wind chill in relation to body heat loss Wc = a chill factor created by the increase in the rate of heat loss by convection and conduction caused by wind

7 Explain why swimming in cold water represents a particular challenge to the body’s ability to thermoregulate Main aspect: thermal conductivity differences between water and air.

8 Discuss the physiological responses to exercise in the cold There are three main adaptive responses by which your body regulates its Tc from chronic exposure to a cold environment: 1. habituation – desesitisation of the normal cold response 2. metabolic acclimatization – greater shivering response = greater heat production 3. Insulative acclimatization – increased vasoconstriction = enhanced heat conservation

9 HOMEWORK Describe the health risks of exercising in the cold and cold water (frostbite and hypothermia only) Discuss the precautions (specifically clothing type and the measurable unit called a “clo”_ that should be taken when exercising in the cold.

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