Body composition: Hydrodensitometry Under Water Weighing test Body composition: “is the percentage of body weight which is fat, muscle or bone”, (bitesize, 2014)
Hydrodensitometry: “Hydrostatic weighing “computes body volume as the difference between body mass measured in (Ma) and body weight during submersion”. Body volume equals loss of weight in water with the appropriate temperature correction for water density”, (page- 792, William D McArdle et al, 2001)
Equipment: 1. Stainless steel weighing tank 2. Underwater mounted chair and scale 3. Weighted belt 4. Nose clip
Procedure: 1. The subject is weighed when he is dry. 2. He/she must wear minimal clothing. 3. They then must sit on the specialized plastic tubular chair. 4. The subject is asked to expel all the air from their lungs. 5. They are slowly submerged into the tank until all their body parts are emerged. 6. Whilst in the tank the seated person must stay motionless whilst their underwater weight is being calculated. 7. “This procedure is repeated several times to get a dependable underwater weight measure”, (Topendsports, 2014)
Advantages: 1. This test greatly indicates the subjects body density. 2. The hydro densitometry is far more accurate than dry weighing on scales, as weighing on scales pose many downfalls - such as the calibration of the scales might be incorrect and it takes into consideration your whole body weight and does not exclude fat etc.
Disadvantages: 1. Need a specialist administer and specialist uni/centre 2. Equipment required is extremely expensive. 3. The skill level of administer needs to be quite high, as they have to prepare the test prior to you being submerged into the water and they need to be able to use the equipment to prevent the subject from danger and harm.
Validity: To increase the validity of the test it must actually measure what the subject is trying to get results for. To increase the validity the subject should be sport specific.
Reliability: The test protocol should be performed the exact same way as it were when you repeat it, this will ensure that the results are far more reliable. The equipment must be the same that was used when the subject was first tested, the same administer should be administering the test or at least present. Both variables will contribute to the reliability of the test.
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