The best and most accurate way of measuring body fat percentage is stepping into a huge machine called the 'Bod Pod' which uses a method called air displacement plethysmography. These machines are expensive however and I believe that there are only 3 in the UK, all at Universities (I think there is one at Kings and one at London Metropolitan University). As this is not an option, the most convenient methods of estimating fat percentage tends to come from measurements like waist circumference and skinfold measurements like the calipers. It measures the different layers of the skin and the layer of subcutaneous fat that lies on top. This is quite hard to get as you need to pinch the skin away from the muscle and can be quite uncomfortable. The measures can be hard to get at on your own so you may need someone there to actually take the skin measurement. These measures can be taken from four sites around the body:
Tricep: Keeping your elbow bent, someone needs to pinch the skin at the mid upper arm level of the tricep (back of arm)
Bicep: Keeping elbow straight, someone needs to pinch the skin at the mid upper arm level of the bicep (front of arm)
Subscapular: Just below your scapula on your back, measured in a 45 degee angle.
Waist: Measure 1cm above the tip of your hip bone in your waistline. Measured horizontally with the subject breathing gently.
The calculation is then done using the Siri equation and the fat percentage can be calculated. The ideal fat percentage for women over 30 is 25%.
Hope that helps.
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