{"id":987474984,"date":"2024-09-12T14:04:59","date_gmt":"2024-09-12T14:04:59","guid":{"rendered":"https:\/\/courses.asiascubainstructors.com\/lessons\/physics-2-responses-to-diving-copy\/"},"modified":"2024-09-13T16:52:14","modified_gmt":"2024-09-13T16:52:14","slug":"physics-3-responses-to-cold-and-heat","status":"publish","type":"lessons","link":"https:\/\/courses.asiascubainstructors.com\/de\/lessons\/physics-3-responses-to-cold-and-heat\/","title":{"rendered":"Restricted content"},"content":{"rendered":"

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Physiology<\/h1>\n

 <\/p>\n

3. Responses to cold and heat<\/h2>\n

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Responses to heat<\/h3>\n

Overheating (hyperthermia<\/strong><\/em>) is a potential problem for divers when fully suited on a hot day.
The body responds to excess heat progressively by first dilating the skin capillaries to promote cooling. If this doesn\u2019t help, sweating starts to cool skin through evaporation
Next step is to accelerate the pulse to circulate blood faster for cooling.<\/p>\n

Heat exhaustion<\/strong><\/em> occurs when the body works at full capacity to cool.
Signs and symptoms are a weak and rapid pulse, profuse perspiration, cool and clammy skin, nausea and weakness.
This person needs to cool off. Remove heavy exposure suit or cool in the water.<\/p>\n

Heat stroke<\/strong> <\/em>results if the body reaches its limits and fails to cool.
The sweating stops, person\u2019s skin is hot and flushed, and pulse is strong but rapid.
This is an emergency medical condition that can cause serious damage to the brain and body systems.<\/p>\n

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Responses to cold<\/h3>\n

Water conducts heat 20 times faster than air, which is why we chill faster in even relatively warm water.<\/p>\n

As the body loses heat, it responds by reducing blood flow to the extremities (fingers and toes go numb).
\nIf the body starts shivering to generate heat through muscle activity, it is a signal that your body is losing the battle against cold. The correct reaction is to end the dive.<\/p>\n

Uncontrollable shivering precedes hypothermia<\/strong><\/em>. This\u00a0occurs when all protective responses fail, shivering stops and the diver feels warm, but core temperature continues to drop.
\nMental processes slow and the diver becomes drowsy, uncoordinated and forgetful.
\nAdvanced hypothermia<\/strong><\/em> is a medical emergency requiring emergency care.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.22.0″ _module_preset=”default” locked=”off” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_column type=”4_4″ _builder_version=”4.22.0″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_text _builder_version=”4.22.0″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”]<\/p>\n