Teljkon
Contributor
This question while it may belong in dive into fitness. Poses a question that I think is advanced. Since I weight around 230 give or take for flux and I take 12 lbs to become neutral and we know that fat displaces .903 gm/l. Shouldn't I be able to figure out my Ww or Wet weight to plug into the formula for body density. So most of the math is straight forward as shown below I cant seem to figure out how to get a good number Ww from the known variables. I have never worked with specific density before or medical equations so I am not completely familiar with the concept or how things apply. even if I just take the 12lbs as the difference I get screwy results.
Body density formula
Wa / (((Wa - Ww) / Dw) - (RV + 100cc)), where Wa = body weight in air (kg), Ww = body weight in water (kg), Dw = density of water, RV = residual lung volume, and 100cc is the correction for air trapped in the gastrointestinal tract.
Once I have body density I can use the Siri equation to get a body fat % for an Anglo.
% Body Fat = (495 / Body Density) - 450
Simply taking 12lb as the difference yields a result of.
Wa = 230
Ww = 218
Dw = 1.025 (think its a little higher in hawaii but no matter)
Rv = I don't know how to get my RV yet but for the sake of estimation 1.2L the male average = 1200cc
230/ (((230 - 218) / 1.025) - (1200+100CC))=
230/ ((12/1.025) - 1300CC)
230/ (11.70- 1300CC)
1cc air= .013grm
1300CC to lbs = .0373lb
230/ 11.6627 = A 19.7 body density
-424.87% body fat?????
Any dive Doctors know where I am screwing the pooch and any idea of how to get to the best Ww??
Body density formula
Wa / (((Wa - Ww) / Dw) - (RV + 100cc)), where Wa = body weight in air (kg), Ww = body weight in water (kg), Dw = density of water, RV = residual lung volume, and 100cc is the correction for air trapped in the gastrointestinal tract.
Once I have body density I can use the Siri equation to get a body fat % for an Anglo.
% Body Fat = (495 / Body Density) - 450
Simply taking 12lb as the difference yields a result of.
Wa = 230
Ww = 218
Dw = 1.025 (think its a little higher in hawaii but no matter)
Rv = I don't know how to get my RV yet but for the sake of estimation 1.2L the male average = 1200cc
230/ (((230 - 218) / 1.025) - (1200+100CC))=
230/ ((12/1.025) - 1300CC)
230/ (11.70- 1300CC)
1cc air= .013grm
1300CC to lbs = .0373lb
230/ 11.6627 = A 19.7 body density
-424.87% body fat?????
Any dive Doctors know where I am screwing the pooch and any idea of how to get to the best Ww??