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BND Sports Science Impact of cold climates on athletes
This lesson: <ul><li>This lesson we will look at: </li></ul><ul><li>The effects a cold environment has on a performer. </l...
Exercise in cold climates <ul><li>Exposing performers to cold produces psychological and physiological effects. </li></ul>...
Cold climates <ul><li>A reasonably cold/cool environment can actually have a good affect on performance. </li></ul><ul><li...
Cold climates <ul><li>It is in cool climates that record times are recorded . </li></ul><ul><li>If the temperature drops d...
So how can an individual gain heat? <ul><li>When the body is exposed to heat it uses mechanisms to try to lose this excess...
Gaining or retaining heat <ul><li>The vasoconstriction of blood vessels tries to prevent heat being lost through the skin....
Gaining or retaining heat <ul><li>Non-shivering thermogensis – an increase in a person’s metabolic rate – this generates b...
What conditions/injuries could extremely cold conditions cause?
Cold climates <ul><li>Cold climates can lead to  frostbite  or  hypothermia . </li></ul><ul><li>Frostbite : </li></ul><ul>...
Frostbite :
Cold climates <ul><li>Ice crystals form inside and rupture. This results in the body’s cells being destroyed. </li></ul><u...
Cold climates <ul><li>Hypothermia:  When the core body temperature drops below 35 °C or lower. </li></ul><ul><li>How bad a...
Hypothermia: <ul><li>Mild – 32.2 - 35°C </li></ul><ul><li>Moderate – 26.6 – 32.2°C </li></ul><ul><li>Severe – less than 26...
Effects of the cold on the CNS <ul><li>Mild – Agitation and shivering </li></ul><ul><li>Moderate – Confused but able to sp...
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09 impact of cold environment

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Transcript of "09 impact of cold environment"

  1. 1. BND Sports Science Impact of cold climates on athletes
  2. 2. This lesson: <ul><li>This lesson we will look at: </li></ul><ul><li>The effects a cold environment has on a performer. </li></ul><ul><li>Hypothermia and its consequences </li></ul><ul><li>The effects different types of clothing has on losing and gaining heat. </li></ul>
  3. 3. Exercise in cold climates <ul><li>Exposing performers to cold produces psychological and physiological effects. </li></ul><ul><li>The severity of the cold and the sport/activity the performer is involved in determines the effect on performance. </li></ul>
  4. 4. Cold climates <ul><li>A reasonably cold/cool environment can actually have a good affect on performance. </li></ul><ul><li>The CV system does not need to divert blood to lose heat, as well as supplying the working muscles. </li></ul><ul><li>This means the heart does not have to work as hard as in the heat. </li></ul>
  5. 5. Cold climates <ul><li>It is in cool climates that record times are recorded . </li></ul><ul><li>If the temperature drops drastically (causing core body temperature to drop), then performance is affected. </li></ul><ul><li>Then the performers VO 2 max will be reduced. </li></ul>
  6. 6. So how can an individual gain heat? <ul><li>When the body is exposed to heat it uses mechanisms to try to lose this excess heat. </li></ul><ul><li>The body when cold, tries to gain or retain heat. </li></ul><ul><li>There are three ways it tries to do this: </li></ul><ul><li>Constriction of blood vessels at skin surface. </li></ul><ul><li>Thermogensis (non-shivering) </li></ul><ul><li>Shivering </li></ul>
  7. 7. Gaining or retaining heat <ul><li>The vasoconstriction of blood vessels tries to prevent heat being lost through the skin. </li></ul><ul><li>Blood is directed away from the skin’s surface to stop it being cooled by the cold environment. </li></ul><ul><li>If a person has more body fat it can also help by insulating the body. </li></ul>
  8. 8. Gaining or retaining heat <ul><li>Non-shivering thermogensis – an increase in a person’s metabolic rate – this generates body heat. </li></ul><ul><li>Shivering – skeletal muscle contracts and relaxes, without the individual’s conscious control. This can also increase metabolic rate. </li></ul>
  9. 9. What conditions/injuries could extremely cold conditions cause?
  10. 10. Cold climates <ul><li>Cold climates can lead to frostbite or hypothermia . </li></ul><ul><li>Frostbite : </li></ul><ul><li>Frostbite usually affects the fingers and toes. When a part of a person’s body becomes very cold, the blood supply to that part is greatly reduced. When this happens the body tissue is frozen. </li></ul>
  11. 11. Frostbite :
  12. 12. Cold climates <ul><li>Ice crystals form inside and rupture. This results in the body’s cells being destroyed. </li></ul><ul><li>The area affected usually goes purple/red, blisters and fills with blood. </li></ul><ul><li>When this happens, the body part generally has to be amputated to stop the infection from spreading. </li></ul>
  13. 13. Cold climates <ul><li>Hypothermia: When the core body temperature drops below 35 °C or lower. </li></ul><ul><li>How bad an individual’s condition is depends on how low the body temperature drops. </li></ul><ul><li>If it drops below 30°C, both the cardiac and respiratory system can fail. </li></ul>
  14. 14. Hypothermia: <ul><li>Mild – 32.2 - 35°C </li></ul><ul><li>Moderate – 26.6 – 32.2°C </li></ul><ul><li>Severe – less than 26.6°C </li></ul>
  15. 15. Effects of the cold on the CNS <ul><li>Mild – Agitation and shivering </li></ul><ul><li>Moderate – Confused but able to speak; shivering stops. </li></ul><ul><li>Severe – pupils now also dilated; then individual slips into a coma. </li></ul>
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