Micronutrients & recovery
Higher muscle mass (lean/fat-free mass) significantly increases serum and urinary creatinine levels, whereas serum cystatin C levels remain unaffected by muscle mass variations.
If you have high muscle mass, your standard blood test for kidney function (creatinine) will likely read higher than average, even if your kidneys are healthy. This can lead to false alarms. If you are muscular, ask your doctor to use Cystatin C for a more accurate assessment of your kidney health, as it is not skewed by your muscle mass.
lean mass was significantly related to serum and urinary creatinine but not with cystatin, even after adjustment for protein/meat intake and physical activity.
Why this rating
Large sample size (n=170), controlled for protein/meat intake and physical activity, multivariate analysis used.
Source
Influence of Muscle Mass and Physical Activity on Serum and Urinary Creatinine and Serum Cystatin C
A. C. Baxmann et al. · Clinical Journal of the American Society of Nephrology · 2008
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