Anyone see the report by the BBC about how the human body copes with cold?
At 21c the body copes well and functions normally.
At 18c it begins to start up its defence system - its aim is to keep
the bodies core temperature at 37c. You will no longer be sweating ( that doesn’t means from being too hot, but normal sweat) and the hairs on your body will now stand up.
18c is the tipping point, and your body now begins to work to keep warm.
From now on your body has to work hard - Next your fingers turn white and they feel cold. The blood vessels in your hands are being closed off - known as vasoconstriction - in order to keep your warm blood for your critical organs.
The first shiver kicks in at 11.5C as your muscles begin to shake to generate heat.
10c is the winter temperature of an unheated home, but your body feels the effect from 18c and below.
Blood flow to the brain is reduced by 20%
Mean arterial blood pressure (systolic and diastolic) up from 99 to 110 mmHg
Heart rate up from 55 to 65 beats per minute.
Breaths up fro 9 to 12 per minute.
Core temperature remains at 37c but extremities like hands, feet, legs and arms as well as skin temperature drops by 2c
"You're delivering less blood to the brain, so there's less oxygen and less glucose [sugar] getting into the brain and the downside of that is it's having a negative impact on your mental gymnastics,"
Imagine a child doing homework in this temperature or someone suffering from dementia.
So pumping warm blood around your body more intensely with the heart beating faster and blood pressure also shooting up.
That increasing blood pressure is a risk factor for a stroke, it's a risk factor for a heart attack,"
The blood itself is also changing "so it becomes a bit like treacle", says Prof Bailey, and this thicker gloopier blood also adds to the risk of a dangerous blockage.
That is why heart attacks and strokes are more common in winter.
At these cooler temperatures, your immune response becomes less active and this can allow virus to grow better within your nose."
So if you can’t afford to heat your home to the optimum temperature of 21c - and it is even more important as you age or/and have underlying health issues
Some tips.
Focus on pure wool clothing and layers.
Gloves and wool socks are important, but a hat will help as well
Eat high calorific foods.
If you can generate more heat by being as active as possible.