Conversely, mean serum cystatin did not differ between these two groups. Individuals with moderate/intense physical activity presented significantly lower mean body mass index (23.1 ± 2.5 versus 25.7 ± 3.9 kg/m 2) and higher lean mass (55.3 ± 10.0 versus 48.5 ± 10.4%), serum creatinine (1.04 ± 0.12 versus 0.95 ± 0.17 mg/dl), urinary creatinine (1437 ± 471 versus 1231 ± 430 mg/24 h), protein intake (1.4 ± 0.6 versus 1.1 ± 0.6 g/kg per d), and meat intake (0.7 ± 0.3 versus 0.5 ± 0.4 g/kg per d) than the sedentary individuals. There was no significant correlation between body weight and lean mass with cystatin C. Results: Serum and urinary creatinine correlated significantly with body weight, but the level of correlation with lean mass was even greater. Blood, 24-h urine samples, and 24-h food recall were obtained from all individuals.
Background and objectives: For addressing the influence of muscle mass on serum and urinary creatinine and serum cystatin C, body composition was assessed by skinfold thickness measurement and bioelectrical impedance analyses.ĭesign, setting, participants, & measurements: A total of 170 healthy individuals (92 women, 78 men) were classified as sedentary or with mild or moderate/intense physical activity.
