I got a quick question. How much of a factor does dehydration play in determining one’s %BF? Does one get a lower reading if he/she is hydrated? Or does one get a lower reading if he/she is dehydrated? Thanks…Tony G
A few random thoughts:
Yes, in a broad sense. Less water=less fat free mass (FFM). Less FFM with fat mass (FM) held constant equates to a higher BF%, even though there was no actual fat gain.
As for “readings,” it depends on what methods you’re utilizing. In bioelectrical impedance, dehydration will definitely affect the result. Water is a good conductor of electricity, so less water leads to slower conduction, and an elevated FM reading.
Check out Jason Norcross’ “Body Composition for Beginners” (parts 1 and 2) for more info on the advantages and disadvantages of various methods.
Hope this helps.
It depends on the method more than anything. Bioimpedance and hydrostatic weighing will be affected more than skinfolds.
Sorry peoples…I am referring to electrical impedance when I ask this question.