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Unfortunately, BMI which is what most people use, only gives a rough
estimate of whether or not you're really overweight or obese because people
have different body types. We use a technique
called the bod pod, where we actually displace air
to determine body density
and from your body density we can fairly accurately determine what
percentage of your body is fat. So the reason we have you wear
compression tights or a speedo swimsuit
is we don't want any air trapped in garments
mass is important to the overall
computations so this is an important step
what I'm going to have you do is put a swim cap on and again it's the same
thing as the shorts
it's because
your hair traps air and it just helps compress
everything down so we so we're getting a more accurate volume. That's good.
I'll have you sit exactly like this I'm going to close the door takes about
fifty seconds
trying not to move because the more you move, the more the air will fluctuate in there
we'll do two of those and if those are in agreement,
we'll do a third with the hose. OK?
The first two measurements are volume measurements so we're strictly measuring
the amount of air he displaces in the Bod Pod
and the third measurement will measure the air that moves in and out of
his lungs as he's breathing so we can subtract that out of his volume
once we get the volume, and we have his body weight, we can calculate body density
once you have body density then we can put that into prediction equations
for percent fat and that's based on different
on gender, age
and different race.
In the Bod Pod, we can use
in both the pediatric population and
we can go up to about 450 pounds.
Alright, are you doing ok? Doing great. Not to strenuous, huh? No.
The instructions from the computer will be ... you'll see a histogram
to breathe in, breathe out, it's just having you breathe your normal
breathing pattern
and that's all there is to it.