The main objective of assessing body composition is to determine the percentage of fat. Among the various possible methods, the one involving the measurement of skinfolds can be quite accurate - if the equations to be used are chosen well. The following equations were inserted in this application:
Jackson & Pollock (1978) for white men, 18 to 61 years old, folds: chest, abdomen and thigh:
Dc (g/cm³)=1.109380-0.0008267(∑3DC)+0.0000016(∑3DC)²-0.0002574(age)
Jackson, Pollock & Ward (1980) for white women, 18 to 55 years old, folds: thigh, triceps and suprailiac:
Dc (g/cm³)=1.0994921-0.0009929(∑3DC)+0.0000023(∑3DC)²-0.0001392(age)
Jackson & Pollock (1978) for black men, 18 to 61 years old, folds: chest, abdomen, thigh, triceps, subscapular, suprailiac and midaxillary:
Dc (g/cm³)=1.1120-0.00043499(∑7DC)+0.00000055(∑7DC)²-0.00028826(age)
Jackson, Pollock & Ward (1980) for black women, 18 to 55 years old, folds: chest, abdomen, thigh, triceps, subscapular, suprailiac and middle axillary:
Dc (g/cm³)=1.0970-0.00046971(∑7DC)+0.00000056(∑7DC)²-0.00012828(age)
Siri (1956, 1961):
%G=[(4.95/Dc)-4.50]x100 (white men ≥ 20 years old)
Heyward (2001):
%G=[(5.01/Dc)-4.57]x100 (white women ≥ 20 years old), %G=[(4.85/Dc)-4.39]x100 (black women ≥ 20 years old deity)
Heyward & Stolarczyk (1996):
%G=[(4.37/Dc)-3.93]x100 (black men ≥ 20 years old)
Lohman (1986):
%F men – 7 to 8 years: [(5.38/Dc)-4.97]x100, 9 to 10 years: [(5.30/Dc)-4.89]x100, 11 to 12 years: [ (5.23/Dc)-4.81]x100, 13 to 14 years old: [(5.07/Dc)-4.64]x100, 15 to 16 years old: [(5.03/Dc)-4, 59]x100, 17 to 19 years old: [(4.98/Dc)-4.53]x100, 20 to 50 years old: [(4.95/Dc)-4.50]x100
%F women – 7 to 8 years: [(5.43/Dc)-5.03]x100, 9 to 10 years: [(5.35/Dc)-4.95]x100, 11 to 12 years: [ (5.25/Dc)-4.84]x100, 13 to 14 years old: [(5.12/Dc)-4.69]x100, 15 to 16 years old: [(5.07/Dc)-4, 64]x100, 17 to 19 years old: [(5.05/Dc)-4.62]x100, 20 to 50 years old: [(5.03/Dc)-4.59]x100
The main idea in making this application available for Android cell phones is to make it easier for interested parties to obtain fat and fat-free masses - which, in addition to practicality, can minimize the chance of possible errors when calculating everything "by hand." " (especially when the number of people evaluated in the same opportunity is large).
It is worth highlighting the great importance of carrying out reliable measurements - because everything follows from them (that is, if the measurement is not done well, everything that comes after, as one of my great teachers said, will not be good... .).
Associated with intelligence, this application can greatly collaborate in an evaluation process relevant to the routine of Physical Education professionals.