title: The association between sleep duration and physical performance in Chinese community-dwelling elderly.
abstract: BACKGROUND
  Physical performance is an important healthy factor in elder people. Good living habits, which include sleep, can maintain physical strength and physical performance. The aim of the present study was to conduct a cross-sectional study to determine the association between total sleep duration and physical performance.
  
  
  METHODS
  Our study population comprised residents of the township central hospital in the suburban of Tianjin, China. We measured muscle strength, walk speed and balance function by grip, 4-m walk test and timed up and go test (TUGT). We divided sleep duration into four groups <7h, 7-8h, >8-9h, >9h.
  
  
  RESULTS
  A total 898 participants had completed data (392 men and 506 women, mean age 67.71 years). In man, adjusted sleep duration was associated with lower grip in > 9 h group, the mean value (95% CI) was 0.429 (0.409, 0.448), and longer TUGT time was also associated with long sleep duration, 10.46s (9.97 s, 10.95 s). In women, adjusted slower 4-m walk speed present an inverse U-shaped relation with sleep duration, by 0.93 m/s (0.86 m/s, 0.98 m/s), 0.97 m/s (0.96 m/s, 1.00 m/s), 0.97 m/s (0.95 m/s, 0.99 m/s) and 0.92 m/s (0.89 m/s, 0.96 m/s); longer TUGT time were associated with long sleep duration (> 9 h), by 11.23 s (10.70 s, 11.77 s).
  
  
  CONCLUSIONS
  In Chinese community-dwelling elderly, lower muscle strength and lower balance function were associated with long sleep duration in men. Slower walk speed and lower balance function were associated with long sleep duration in women.
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: Liyuan
authors.initials: L
authors.lastname: Fu
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Liye
authors.initials: L
authors.lastname: Jia
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: Peipei
authors.initials: P
authors.lastname: Han
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Li
authors.initials: L
authors.lastname: Kang
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Yixuan
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Hairui
authors.initials: H
authors.lastname: Yu
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Tianqi
authors.initials: T
authors.lastname: Zhai
authors.affiliation: Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin, China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Chen
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.identifier: http://orcid.org/0000-0002-0193-4388
authors.initials: Q
authors.lastname: Guo
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D005260:Female; D015577:Geriatric Assessment; D018737:Hand Strength / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology; D012890:Sleep / Q000502:physiology*; D016138:Walking / Q000502:physiology