SEHS A.2 (SL)

Hot environments:

The body uses the principles of conduction, convection, radiation and

Exercise in the heat or humid conditions reduces the between skin and environment and thus between the skin and core.

Humidity imposes a heat loss barrier to the  process and this severely limits our ability to perform. This then puts more pressure on the system and the result is an elevated heat rate. When exercising it is important to remember that:

• If you were exercising (which produces heat) or enter a steamy sauna, your skin blood vessels would to direct that warm blood towards the skin surface so heat can be dispersed.

• During heavy work, muscles need blood flow, which reduces the amount of blood available to flow to the skin and release the heat.

In the wind: Wind the speed of evaporation as it carries the sweat particles away. The wind increases the thermal gradient.

The Syllabus asks you to be aware of "what steps should be taken to prevent and to subsequently treat heat-related disorders".

Here are some common sense tips from the California dept of public health. Drag and drop the headings:

Sweating removes needed salt and minerals from the body. When it is hot, drink more water, juice and sports drinks. Avoid drinks with caffeine (tea, coffee, and cola) and alcohol. Be sure to eat regularly.

The best way to beat the heat is to stay in an air conditioned area. If you don’t have an air conditioner, go to a shopping mall or public building for a few hours. A cool shower or bath is also a good way to cool off.

Wear as little clothing as possible when you are at home. Choose lightweight, light-colored, loose-fitting clothing. In the hot sun, a wide-brimmed hat will keep the head cool. If you will be in direct sun, use a sunscreen with a sun protection factor (SPF) of 15 or higher and follow package directions. Reapply every 2 hours while in the sun.

Try to be less active during the hottest part of the day, late afternoon. If you must be out in the heat, plan your activities so that you are outdoors either before noon or in the evening. While outdoors, rest often in a shady area. Never leave kids or pets in a parked ca

If you are not used to working or exercising in hot weather, start slowly and pick up the pace gradually. Take frequent, regularly scheduled breaks. If activity in the heat makes your heart pound or leaves you gasping for breath, stop activity, get into a cool or shady area, and rest. Especially if you become lightheaded, confused, weak or feel faint.