Distribution characteristics of skeletal muscle mass and grip strength in the elderly aged 65 years and older in 18 longevity areas in China
Objective To investigate the distribution characteristics of skeletal muscle mass and strength in the older adults over 65 years old in 18 longevity areas in China.Methods The subjects were selected from the Healthy Aging and Biomarkers Cohort Study conducted in 18 longevity areas of China.A total of 4 662 older adults over 65 years old from a cross-sectional survey in 2021 were included in the study.The information about their sociodemographic characteristics,lifestyle,nutrient intake and other factors were collected through questionnaire surveys and physical examinations.Grip strength was measured by using professional electronic grip dynamometer.Total skeletal muscle mass(TSM)was measured using bioelectrical impedance analysis,and TSM was adjusted by height squared and BMI to obtain TSMHt2 and TSMBMI.The proportion of individuals with low muscle mass and strength was determined according to the recommended method by the Asian Working Group for Sarcopenia(AWGS).Descriptive analysis was conducted on the population and regional distribution characteristics of people with different muscle mass and grip strength.A generalized additive model was used to analyze the age-related trends of muscle mass and grip strength.Results The age of 4 662 study subjects was(82.69±10.54)years,men accounted for 46.85％(2 184 cases)and Han Chinese accounted for 96.27％(4 488 cases).The M(Q1,Q3)of TSM,TSMHt2 and TSMBMI in men were 23.30(20.50,26.20)kg,9.02(8.13,9.89)kg/m2,and 1.01(0.90,1.13)kg·(kg/m2)-1,respectively,which were all higher than those in women[TSM:18.20(15.70,20.70)kg,TSMHt2:8.18(7.42,9.07)kg/m2and TSMBMI:0.79(0.69,0.90)kg·(kg/m2)1],the differences were significant(all P＜0.001).The grip strength of men[M(Q1,Q3):24.50(17.80,30.80)kg]was higher than that of women[M(Qv Q3):15.60(11.10,19.90)kg],the difference was significant(P＜0.001).Southern elderly men had lower TSM and TSMHt2 compared with northern elderly men(all P＜0.001),while there was no significant regional difference in TSMBMI(P＞0.05).Southern elderly women had higher TSMHt2 and TSMBM,compared with northern elderly women(all P＜0.001),while there was no significant regional difference in TSM(P＞0.05).Furthermore,according to the method recommended by AWGS,the elderly with low muscle mass and grip strength were characterized by older age,illiteracy,being unmarried/divorced/widowed,poor chewing ability,impaired activity of daily living and living in southern region.Conclusion There were population and regional differences in muscle mass and grip strength in the older adults over 65 years in 18 longevity areas of China,and these differences showed decreasing trends with age.
NETL
NSTL
万方数据
