Exercise Physiology Body Composition

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  • Topic: Body fat percentage, Body mass index, Adipose tissue
  • Pages : 5 (1122 words )
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  • Published : February 5, 2011
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Body Composition

Rationale/Purpose
In this lab, we conducted body composition measurements to estimate fat mass and fat-free mass. We obtained skinfold measurements, found out the body mass index, waist to hip ratio, and conducted hydrostatic weighing.

Methods
This lab enabled us to use two individuals in which we obtained body composition measurements from. • First, we measured the height and weight of our two individuals. Getting these measurements enabled us to calculate their body mass index. The body mass index is weight in kilograms divided by height2 in meters. • Next, we found the waist circumference of our individuals. We measured at the umbilicus and read the measurements in centimeters. Waist circumference can be associated with diseases such as heart disease, hypertension, and diabetes. • We then conducted a series of seven skinfold measurements. Skinfold testing measures fat located beneath the skin. We measured at the chest, midaxillary (near xyphoid process), triceps, subscapular, abdominal, suprailiac, and at the thigh.The tester pinched the subject’s skin at the appropriate site to raise the skin and the underlying adipose tissue, but not the muscle. With the appropriate tool, the tester then measured the thickness. When testing an individual, the same side of the body should be used consistently in order to ensure proper measurements. • Next, we conducted hydrostatic weighing. This is a more accurate way of estimating body fat by measuring body density. We first weighed his/her bathing suit. They then showered off and focused on completely soaking their hair. They then proceeded to get into the pool, which is used specifically for underwater weighing. We noted the water temperature, the water density, and the weight of the chair. Our subject then sat in the chair and hooked his/her arms around the back of the chair. They then leaned forward, completely exhaling all air from their lungs, and submerged themselves in the water. The rest of the group read the scale that determined their underwater mass. Every revolution on the scale was 3 kilograms. Both subjects did this procedure three times and got consistent readings.

Results
The skinfold testing and the hydrostatic testing enabled us to compare our results and to see how accurate they were to each other. Before we conducted the hydrostatic testing of our individuals, we obtained initial measurements. We found age, weight, height, waist, and performed the skinfold tests on seven specific parts on their body. These were the chest, midaxillary, triceps, subscapular, abdominal, suprailiac, and the thigh. We also weighed their bathing suit and determined the water temperature, the water density, and the weight of the chair. Finally, we took readings from the hydrostatic weighing. This information is displayed below in Table A. After finding these results, we calculated the body mass index, body density(skinfold test), body fat percentage (skinfold test), residual volume, mass underwater, body density(hydrostatic weighing), and a series of body fat percentages from hydrostatic weighing. This information is displayed in Table B.

Table A:
| |Subject A |Subject B | | |Male |Female | |Age |23 years |20 years | |Height |187.5 cm |170 cm | |Weight |74.5 kg |56.9 kg | |Waist |80 cm |75.5 cm |...
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