Body composition measurements were recorded using a simple measuring tape. Height and weight were measured in 85 study participants using a wall-mounted stadiometer and digital scale. ![]() The objective of our study was to compare the results of body fat composition by these two methods. The navy-seal formula is another simple way of measuring body fat ratio which takes into account simple variables such as gender, weight, height, waist, hip and neck circumference. Muscular folk would be better off using calipers, DXA body scans, or rounding up 800 people to guess their body fat percentage than using the RFM.There are many different ways to measure body composition and bioelectric impedance is one of the most popular methods to measure body ratios. So while the RFM might be useful and more accurate for regular, non-lifting Joes than the BMI formula, it'll give absurd readings on muscular people and if it becomes as widely accepted as I expect it to, lifters will suffer the same kind of discrimination they always have. A 6-foot tall lifter with a ripped 32-inch waist could easily have a body fat percentage anywhere from 3% to 12%, but the size of his muscular core, when plugged into the RFM equation, insists he's 18% body fat, which, at least comparatively speaking, makes him a regular fatty. ![]() Neither formula distinguishes between muscle and fat, and anyone who lifts weights – anyone who regularly does squats, deadlifts, weighted carries, or heavy rows – is going to have well-developed external obliques, erector spinae, and transversus abdominus, all of which might make a waist measurement larger, regardless of body fat.Ĭonsider our hypothetical example above. While it might work for "normal" people, the RFM, like the BMI, is biased against muscular men and women. What? You don't think that number sounds right? Me neither. Subtract 46 from 64 – which comes out to a body fat percentage of 18.82.Convert 32 inches to centimeters – 81 (rounded off).Convert 72 inches to centimeters – 183 (rounded off).So, if you're a 6-foot tall man with a 32-inch waist, it works out like this: Women: 76 – (20 x height/waist circumference) = RFM.Men: 64 – (20 x height/waist circumference) = RFM.Then plug the numbers into one of the following sex-specific equations: ![]() Next, measure your waist circumference, placing the tape measure at the top of the hip bone. First, measure your height in centimeters. The winning body fat formula was the relative fat mass index, or RFM, which is so simple, anyone can do it at home. The Cedar Sinai researchers took over 300 possible body fat formulas out for a run on 3,500 patients and compared the results to the DXA body scan, which is the gold standard for technology-driven body fat analysis. Plug almost any experienced lifter's numbers into a BMI equation and it'll hit over 27, automatically causing the specter of Adolphe Quetelet, the Belgian mathematician who invented the BMI formula, to appear out of the ether and point at you, calling you "Fatso!" in Dutch.Ĭlearly, a better way to determine body fat percentage is needed, and investigators from Cedar Sinai think they've found it. However, the BMI doesn't distinguish between muscle, bone mass, or fat. The armed forces (with the exception of the Navy, which just uses body fat percentage) also use BMI to determine if a recruit is fit to serve, with the minimum BMI being between 17 and 19 (depending on the branch) and the maximum being 27.5 (except for the Marines, who are more liberal in this regard). Insurance companies still use the BMI to determine insurance rates, with people on the high end being monetarily penalized because they stand a better chance of dying early and costing insurance companies a giant gravy boat full of money. ![]() The BMI supposedly tells us if the individual is underweight, normal weight, overweight, or obese.
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