Energy expenditure, intake and balance

1852 Words Oct 5th, 2013 8 Pages
Task 1 [P3, M1]
Describe/explain potential sources of energy intake and expenditure and the factors that affect intake and expenditure such as basal metabolism, age, gender, climate and physical activity.

Food is a source of energy intake as it contains carbohydrates; there main function is to store energy in the muscles. Carbs are a macronutrient and come in two different forms, simple which are foods like chocolate and sweets these release energy quickly, the other form is complex which are foods like pasta and rice they release energy slower so are better to keep energy for a sustained period of time. There are certain factors that affect energy intake for instance what gender you are affects how much energy you need, a male’s
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These measurements are then converted into body fat percentage using an equation; a male should have around 15% body fat whereas a female should have 20-25% due to them having breasts etc.
(100 words)
Bioelectrical Impedance- Bioelectrical impedance measures the resistance of body tissues to the flow of a small electrical signal. The proportion of body fat can be calculated due to the current flowing through the parts of the body that are made up of mostly of water such as blood, urine and muscle this is not possible through bone, fat and air. By doing this it is possible to work out how much body fat the person has by combining the bioelectric impendence measurement with factors such as gender, age, height, weight, and fitness level.
(100 words)
Hydro densitometry- Hydro densitometry (which is also known as hydrostatic weighing) is weighing someone while they are in water, it is considered to be the most accurate form of measuring body fat. A very large tank of water is used for this test, firstly a comparison is made between the underwater weight and the dry weight of a person. Due to fat being less dense than the other tissues in the body, it floats more easily. The more fat a person has on their body, the greater the difference between the dry and wet weights. While this method of measuring is very accurate and considered the best way of measuring body fat, not many people use this method because the equipment and test is highly expensive.
(100 words)
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