Background Previous studies have presented inconsistent results on the
relationship between serum uric acid and skeletal muscle mass (SMM). We aimed to
explore whether a higher serum uric acid level was associated with low SMM in
the Chinese population.
Methods We performed a cross-sectional analysis of 6595 subjects aged 45
years or older. They were tested for fasting blood glucose, total cholesterol,
triglycerides, high-density lipoprotein-cholesterol, low-density
lipoprotein-cholesterol, uric acid, blood urea nitrogen, creatinine, and
estimated glomerular filtration rate. SMM was accessed by dual-energy x-ray
absorptiometry using two approaches: weight-adjusted appendicular skeletal
muscle mass (ASM)% and ASM/BMI (body mass index
(kg/m2)). Low SMM was defined as a cut-off point of
ASM/BMI<0.789 for men and<0.512 for women.
Results Compared with their normal group, patients with hyperuricemia had
lower ASM% (29.33±2.33 vs 30.03±2.34 for males and
24.71±1.99 vs 25.19±2.07 for females, P<0.01) and
ASM/BMI (0.83±0.10 vs 0.85±0.10 for male and
0.60±0.07 vs 0.62±0.07 for female), with a higher prevalence of
the associated low SMM in both sexes (35.2 vs 26.5% for male and 10.5 vs
5.9% for female, P<0.01). Pearson analysis showed that
ASM% and ASM/BMI were negatively correlated with SUA (male:
ASM/BMI, r=−0.097, ASM%,
r=−0.146; female: ASM/BMI, r=−0.151,
ASM%, r=−0.157; all P<0.001). Logistic
regression analysis showed a positive association of hyperuricemia with adjusted
risk of low SMM association.
Conclusions In a middle-aged and elderly Chinese population, hyperuricemia
is independently and positively associated with low SMM and can vary by age and
gender.