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bakerstreet
06-30-2005, 09:16 PM
Has anyone ever used a Bod Pod for BF testing? The campus I work at has one that I am going to try out next week. It is suppose to be about as accurate as hydrostatic testing. I was just wondering if anyone has had any experience with it and if so what you thought of it.

erp7e
07-03-2005, 04:57 AM
Autopsy is the only reliable measurement. So it's very hard to tell in these studies which method is most accurate. At this point, it appears DEXA may be most accurate, mainly because it avoids the technique problems of underwater weighing, but air displacement may show promise.

The concept is very different. It measures how much space you take up (air), and measures your weight, thereby calculating your density, which it uses to approximate LBM and therefore bf%.

Underwater weighing, however, only weighs that which is NOT buoyant in water. When you sit in the tank, fat floats, so the only weight it can measure is LBM, the caveat being whatever residual air is in your lungs will be bouyant. It uses this along with your total body mass to calculate bf%. It is indeed technique dependent, one of its criticisms.

Density vs. measuring actual fat-free mass = you may get different results. They each are using formulas to approximate it, which may or may not apply to you. If this technology is available to you, though, certainly try it out. The important thing is to use a rather *precise* method (not necessarily an *accurate* method), and measure it the same way each time, to track progress.

bakerstreet
07-05-2005, 02:43 PM
Autopsy doesn't sound like a good time. ;) My appointment is this friday so I'll let you guys know how it goes. Thanks for the informative response.

bakerstreet
07-08-2005, 04:04 PM
The Report:

Well I went and got dunked in water this morning, as well as, sat in a giant egg looking device. The bodpod was nice in the fact that I didn't have to get wet and the egg/seat thing you sit in is comfortable. Plus it only takes 50 seconds for a reading. The testing dude did it twice to double check the results, which is standard practice.

Hydrostatic wasn't that bad either. I wasn't a huge fan of expelling all of my air and then going under water, but it really wasn't that bad since you don't have to be under the water long. I got dunked 4 times to form an average.

As for the accuracy comparision..

There was a differance of 4.5% between the dunk tank and the bodpod. The bodpod recorded the higher bodyfat.

I sat and talked to the guy that runs the lab a little afterwards and he said that they just got done with a comparision study between the two techniques on female and male collegiate atheletes. He said that they found that in nearly all cases the bodpod recorded a slightly higher bodyfat reading vs hydrostatic. He said that the differance was very small to almost negligible in male atheletes. Whereas, female atheletes showed a signficantly higher percentage in the bodpod. The differance in my test was probably due to my higher percentage of bodyfat vs your average male athelete. So in conclusion...the bodpod was very cool and very convenient, but hydrostatic still seems to be more accurate especially for the female and feastively plump population.