Bodyfat Percentage - Determining Accurate Bodyfat Easily

The options regarding air in your lungs: There really is a tremendous advantage in trying to expel all the air you can, because once you have learned to achieve that level, it is pretty reliably constant. In our precise expectations of things, within two or three letters is realistic, which commonly means within around 1% precision and repeatability. In contrast, if you think you can just try to "always have the same amount of air in your lungs, whether at a standard exhale or some average amount of air, on our letters scale, you can easily show that you get results which are very different! If you try to do it at what you consider a standard exhale, you will likely be at about 45 letters above (heavier) than the maximum expelling mode which we use. In itself, that might not be terrible, but your repeatability of exhaling exactly the same is not good! The point is, one time you try it, it might be 35 letters heavier and the next time it might be 55 letters heavier, and your normal exhales might feel exactly the same to you. If your data can be off either way by five or ten letters each time, the bodyfat percentage data figures can vary by 7% to 10% each time, unexpectedly, the idea of trying to CHART the results becomes less possible! Your data might be varying by several percent up and down, just because of these differences. The value of learning to expel absolutely all the air you can is that once you get practiced at doing that, you are likely to have a rather consistent amount of air remaining in your lungs (very likely around 1.2 liters). Since that amount is pretty constant each time, your baton choices are more consistent and your results more accurate.

The highly respected and proven Hydrostatic Weighing (done in a swimming pool with a giant precise scale and hanging chair) REQUIRES the person to do maximum exhaling. In fact, even with that consistency of maximum exhalation, they STILL feel it necessary to REPEAT that exhaling and submersion TEN TIMES (over a period of about an hour) to then select and use only the three (highest) weight readings, because even then, they find variations in the amount of air a person exhales each time. The point here is that we are encouraging the same MAXIMUM EXHALING here, which is well proven to provide the most accurate data.

Bodyfat - Combating Childhood Obesity Through Motivation (Childhood Obesity)

The Bodyfat - Simple and Accurate Measurement - PSA Storyline (storyline of the 30-second and one-minute PSA (Public Service Announcement) TV presentations.

The page that provides the PVC construction details for the Batons and Floats and all the printable Analysis Charts is at:
Bodyfat Analysis Weights - Filled PVC Plastic Batons ../public2/bodyfwp2.html

The page that provides the construction details for the Pepsi bottle-based Batons and Floats and all the printable Analysis Charts is at:
Bodyfat Analysis Weights - Pepsi Bottles and Pennies ../public2/bodyfwp3.html

The page that has the Bodyfat Percentage - Determining Accurate Bodyfat Easily which uses the Baton/Float letters and the dry body weight

Other Health-Related Web-Pages in this Domain

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C Johnson, Theoretical Theoretical Physicist, Physics Degree from Univ of Chicago