A little further evidence of how much of a pinch of salt to take Bioelectrical impedance readings with:
I've had 3 readings taken on different equipment in the last couple of days.
- Salter home scales (athlete algorithm) 26% body fat
- Salter home scales (normal algorithm) 29% body fat
- Tanita (normal algorithm) 39.1% body fat.
I like the '.1' just to give the impression of precision.
And comedy moment down the gym, while having my BF% 'measured' on the Tanita equipment. The machine gives a print out including BMI, which is 31.1. The guy who'd taken the reading starts talking me through the results. Looks at my BMI reading and starts saying " BMI is a function of your height and weight (all good so far...) so given your height and weight (looks up my height and weight on a wall chart) your BMI should be about 31. That's exactly what the machine says so that's just right... perfect - exactly where you need to be"
I just nodded and smiled.
Edit: It's not just bioelectrical impedance that has its flaws. YMCA tape method puts me at 17%. US navy tape method has 25%. Do any of these things agree with each other? 17-39.1% is quite a range. Not really that bothered and I actually don't need to know what it is. Wouldn't know where to start with skinfolds...