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 acclimmatizationLower heart rateLower core temperatureIncreased plasma volumeEarlier onset of sweating (at a lower temp)More dilute sweat (less electrolyte loss)Reduce rate of muscle glycogen useDecreased psychological effect of effort
4 Non-shivering thermogenesis (BAT) Outline the principle means by which the body maintains core temperature in cold environmentsNon-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 Main aspect: thermal conductivity differences between water and air. Explain why swimming in cold water represents a particular challenge to the body’s ability to thermoregulateMain 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 response2. metabolic acclimatization – greater shivering response = greater heat production3. Insulative acclimatization – increased vasoconstriction = enhanced heat conservation
9 HOMEWORKDescribe 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.