title: Sleep/wake patterns and physical performance in older adults.
abstract: OBJECTIVE
  Sleep problems are common in older adults. They have been associated with reduced physical functionality affecting their health, well-being, and consequently their overall quality of life. We conducted this study to examine the association between sleep/wake patterns and functional capacity in hypertensive older adults.
  
  
  METHODS
  Participants were recruited from the study "Effect of the angiotensin-converting enzyme inhibitors over grip strength and functionality of older adults" and accepted to be part of this cross-sectional study. Subjects were 97 older adults with a mean age of 74.8 ± 3.3 years and 77 % were women. Sleep/wake patterns were determined through actigraphic data and the following variables were determined: total sleep time, number of awakenings and wake after sleep onset within the nocturnal period, and number of naps and total sleep time during the diurnal period. Functional performance measurements included short physical performance battery and grip strength. Differences in physical performance according to sleep/wake patterns were explored, and the association between the sleep/wake patterns and functionality adjusting by sex, age, body mass index, use of angiotensin-converting enzyme, number of diseases, and hypnotic intake was studied using logistic regression analysis.
  
  
  RESULTS
  Subjects sleeping <7.0 h or having fragmented sleep with >2.0 awakenings/night had a slightly but significant higher odds ratio of having functional performance impairment (p < 0.05).
  
  
  CONCLUSIONS
  Our results suggest that a better nighttime sleep consolidation might help improve daytime physical performance of older people.
authors.affiliation: Sleep and Functional Neurobiology Laboratory, INTA, University of Chile, Macul 5540, Macul, P.O. Box 138-11, Santiago, Chile. sreyes@inta.uchile.cl
authors.forename: Sussanne
authors.initials: S
authors.lastname: Reyes
authors.forename: Cecilia
authors.initials: C
authors.lastname: Algarin
authors.forename: Daniel
authors.initials: D
authors.lastname: Bunout
authors.forename: Patricio
authors.initials: P
authors.lastname: Peirano
mesh_terms: D056044:Actigraphy; D000368:Aged; D000375:Aging / Q000502:physiology*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D009142:Musculoskeletal Physiological Phenomena; D012890:Sleep