title: Sleep quality improved following a single session of moderate-intensity aerobic exercise in older women: Results from a pilot study.
abstract: BACKGROUND
  Poor sleep quality is associated with adverse effects on health outcomes. It is not clear whether exercise can improve sleep quality and whether intensity of exercise affects any of the effects.
  
  
  METHODS
  Fifteen healthy, non-obese (body mass index = 24.4 ± 2.1 kg/m2, mean ± SD), sedentary (<20 min of exercise on no more than 3 times/week) older women (66.1 ± 3.9 years) volunteered for the study. Peak oxygen consumption (VO2peak) was evaluated using a graded exercise test on a treadmill with a metabolic cart. Following a 7-day baseline period, each participant completed two exercise sessions (separated by 1 week) with equal caloric expenditure, but at different intensities (60% and 45% VO2peak, sequence randomized) between 9:00 and 11:00 am. A wrist ActiGraph monitor was used to assess sleep at baseline and two nights following each exercise session.
  
  
  RESULTS
  The average duration of the exercise was 54 and 72 min, respectively at 60% (moderate-intensity) and 45% VO2peak(light-intensity). Wake time after sleep onset was significantly shorter (p= 0.016), the number of awakenings was less (p= 0.046), and total activity counts were lower (p= 0.05) after the moderate-intensity exercise compared to baseline no-exercise condition.
  
  
  CONCLUSIONS
  Our data showed that a single moderate-intensity aerobic exercise session improved sleep quality in older women.
authors: Department of Exercise Science, University of South Carolina, Columbia, SC 29208, USA ; Division of Geriatrics and Nutritional Science, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
authors: Xuewen
authors: X
authors: Wang
authors: Department of Exercise Science, University of South Carolina, Columbia, SC 29208, USA.
authors: Shawn D
authors: SD
authors: Youngstedt
keywords: Actigraphy; Activity counts; Exercise; Older adults; Sleep quality; Wake after sleep onset