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Monday, 29 November 2010

tidur didalam hawa dingin...

Sebenarnya tidur didalam bilik dengan penghawa dingin tidaklah elok.. malah ianya dehydrate kulit dan membrane hidung kita dan banyka lagi...

Baca lah di bawah..

Thanks to home
::Sleeping in a cold room has no evidence of increasing your resistance to colds. In fact it may make your problem worse. And if the room is very cold and very dry then it may cause some serious complications as it would dry out the mucous membranes in your nose and will cause a very dry throat too so you would probably wake up with a sore throat, cold or a bad headache. If you like sleeping in a cold room then make sure you have a humidifier to balance the moisture in the room.::

causes of Obesity/increased body weight:

:decreased variability in the temperature of our surroundings (air con, heating, indoor lifestyles).

The temperature of our surroundings may play some part in our increasing weight problem. When we are cold we shiver – when we are hot we sweat ... both of those bodily processes burn calories in our attempts to maintain a stable body temperature.

When we are thermally comfortable ie. not too hot or too cold, we do not require energy consumption to maintain our body temperature, as our clothing and environmental heating or air con serve that function for us. This is what scientists call our thermoneutral zone (TNZ) and evidence suggests that we spend more time in this state than we used to in the past.

British household temperatures have risen by 5°C (9°F) over the past three decades from 1970. U.S. indoor thermal standards for winter comfort have risen from 18°C (64°F) in 1923 to 24.6°C (76°F) in 198626,27.

In the US, the proportion of households with no air conditioning dropped from 44% in 1978 to 28% in 1997. Taking a look at the extreme case, by 1997, 93% of households in the southern US (where some of the highest obesity rates in the world are found) had some form of air conditioning, compared with 74% in 197828.

Even in the UK, the amount of energy consumed by air conditioning has risen dramatically as more shop, offices and cars are fitted with air con to improve comfort levels.::


taken from Harry Clarke blog with

2. Climate control. Humans like to keep our core body temperatures pretty constant regardless of what's going on in the world. We do this by shivering or sweating. Keeping warm and staying cool take energy unless we are in the ‘thermoneutral zone’ of around 27 °C for a naked body - increasingly where we choose to live and work.

Ambient temperatures have changed in the past few decades. Between 1970 and 2000, the average British home warmed from a chilly 13 °C to 18 °C. In the US, the changes have been at the other end of the thermometer as the proportion of homes with air conditioning rose from 23 to 47% from 1978 to 1997. In the southern states - where obesity is highest - the houses with air con has shot up to 70% from 37% in 1978.

Studies of people in respiration chambers show that, in comfortable temperatures, we use less energy. In one study of women exposed to 27 °C versus 22 °C, it amounted to a difference of about a megajoule (239 kilocalories) a day. That's the amount of energy in 27 grams of body fat.

Sweating burns up energy, however, and there's good evidence that high temperatures reduce the amount people eat. Whether these factors significantly alter energy balance is not clear, but it's got to be worth investigating.