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ex phys lab 10

ex phys lab 10 - Wendy Cao Post Lab 10 Exercise Physiology...

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Wendy Cao 05/06/08 Post Lab 10 Exercise Physiology Lab 2 Title: The Composition of the Body Purpose: The main purpose of this lab is to learn a detailed, in depth description of the hydrostatic technique for determining body composition. This is so that any individual may utilize this information to construct a system to quantify human body-fat tissue. The second purpose of this lab is to also learn the theoretical implications and assumptions used when using the hydrostatic technique in determining body composition. Method Pre measuring/weighing : 1) Before measuring and weighing is commenced, the individual should not eat, drink, smoke, or engage in strenuous activity. 2) The individual should come in prepared wearing his/her bathing suit and bringing his/ her own towel Equipment: The following equipment will be needed for the lab: 1) Scale, Tare, Thermometer, Hydrostatic tank, computer, towel, CBC software, and skinfold calipers Hydrostatic Weighing: 1) Record, height, weight, and age on the provided data sheet. When recording the weigh, the individual should be in the attire to be worn during the weighing. 2) Record the tare weight and the temperature of the water 3) Remove all jewelry prior to entering the tank. 4) The subject enters the hydrostatic tank. He/she should be completely immersed in the water with all the air bubbles removed from skin and hair. 5) Complete underwater weighing according to the instructions provided by the teaching assistants, by discussion in pre-lab lecture, and by demonstration. a. The subject’s lungs must be as nearly deflated as possible, maximal expiration, with a correction made for the air remaining in the lungs called residual volume. 6) After completing 5 successful weight readings, the subject may leave the tank. 7) Subtract the tare weight from the underwater weight to receive the real underwater weight of the subject. 8) Enter data into CBC program to calculate the % fat a. % fat can be found using the Rathbun and Pace, Siri, or Brozek at al % fat equations. But the Siri is used the most because it yields a midway value for percentage fat.
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i. % fat = 5.548/Density – 5.044 x 100 (Rathbun and Pace) ii. % fat = 4.95/Density – 4.50 x 100 (Siri) iii. % fat = 4.570/Density – 4.142 x 100 (Brozek at al) b. Density = M o / [(M 1 – M 2 ) – RV]/ D w i. D o = body density (gm/cc) ii. M 1 = body weight on land in grams iii. M 2 = apparent underwater weight (grams from scale) iv. D w = density of water (gm/cc)
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ex phys lab 10 - Wendy Cao Post Lab 10 Exercise Physiology...

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