title: Body mass index is associated with physical performance in suburb-dwelling older chinese: a cross-sectional study.
abstract: BACKGROUND
  Physical performance is reported to have various beneficial effects on human health, especially in older individuals. Although such effects are associated with body mass index (BMI), the relationship between BMI and physical performance has not been clarified.
  
  
  METHODS
  We conducted a cross-sectional study of 966 suburb-dwelling Tianjin individuals aged ≥ 60 years (average age 67.5±6.02, men 435, women 531). Mobility, balance, and muscle strength were assessed by walking speed, timed up-and-go test (TUGT), and grip strength, respectively. The subjects were categorized into three groups based on BMI (kg/m2) as follows: normal weight, 18.5 ≤ BMI ≤ 23.9; overweight, 24.0 ≤ BMI ≤ 27.9; and obese, BMI ≥ 28.0.
  
  
  RESULTS
  After adjusting for all other variables, relative grip strength decreased when BMI increased in both men and women (P for trend <0.001 and <0.001, respectively). BMI may be negatively associated with TUGT performance in the women only. There was no apparent association between walking speed and BMI in either sex, but after adjusting for age, walking speed was faster when BMI increased in women (P for trend= 0.0162).
  
  
  CONCLUSIONS
  This study suggests that in older individuals, higher BMI is associated with poor muscle strength in both sexes.
authors.affiliation: Department of Rehabilitation Medicine, Cardiovascular Clinical College of Tianjin Medical University, TEDA International Cardiovascular Hospital, Tianjin, China; Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Suxing
authors.initials: S
authors.lastname: Shen
authors.affiliation: Key Laboratory of Hormones and Development (Ministry of Health), Metabolic Disease Hospital & Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Rehabilitation Medicine, Cardiovascular Clinical College of Tianjin Medical University, TEDA International Cardiovascular Hospital, Tianjin, China; Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Guo
authors.affiliation: Department of Rehabilitation Medicine, Cardiovascular Clinical College of Tianjin Medical University, TEDA International Cardiovascular Hospital, Tianjin, China; Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Xiuyang
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Fu
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Linke
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Yufang
authors.initials: Y
authors.lastname: An
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Weixi
authors.initials: W
authors.lastname: Liu
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Hongyun
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Huang
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Zedan
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Nutritional Epidemiology Institute, Tianjin Medical University, Tianjin, China; School of Public Health, Tianjin Medical University, Tianjin, China.
authors.forename: Kaijun
authors.initials: K
authors.lastname: Niu
mesh_terms: D000368:Aged; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D053580:Muscle Strength; D013383:Suburban Population