title: Relationship between sleep quality and quantity and weight loss in women participating in a weight-loss intervention trial.
abstract: Evidence suggests that individuals who report fewer total hours of sleep are more likely to be overweight or obese. Few studies have prospectively evaluated weight-loss success in relation to reported sleep quality and quantity. This analysis sought to determine the association between sleep characteristics and weight loss in overweight or obese women enrolled in a randomized clinical trial of a weight-loss program. We hypothesized that in overweight/obese women, significant weight loss would be demonstrated more frequently in women who report a better Pittsburgh Sleep Quality Index (PSQI) Global Score or sleep >7 h/night as compared to women who report a worse PSQI score or sleep ≤7 h/night. Women of ages 45.5 ± 10.4 (mean ± SD) years and BMI of 33.9 ± 3.3 (n = 245) were randomized and completed PSQI at baseline and 6 months; 198 had weight change assessed through 24 months. At baseline, 52.7% reported PSQI scores above the clinical cutoff of 5. Better subjective sleep quality increased the likelihood of weight-loss success by 33% (relative risk (RR), 0.67; 95% confidence interval (CI), 0.52-0.86), as did sleeping >7 h/night. A worse Global Score at 6 months was associated with a 28% lower likelihood of continued successful weight loss at 18 months, but unassociated by 24 months. These results suggest that sleep quality and quantity may contribute to weight loss in intervention-based studies designed to promote weight control in overweight/obese adult women.
authors.affiliation: Department of Nutritional Sciences, University of Arizona, Tucson, AZ, USA. cthomson@email.arizona.edu
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Thomson
authors.forename: Kelly L
authors.initials: KL
authors.lastname: Morrow
authors.forename: Shirley W
authors.initials: SW
authors.lastname: Flatt
authors.forename: Betsy C
authors.initials: BC
authors.lastname: Wertheim
authors.forename: Michelle M
authors.initials: MM
authors.lastname: Perfect
authors.forename: Jennifer J
authors.initials: JJ
authors.lastname: Ravia
authors.forename: Nancy E
authors.initials: NE
authors.lastname: Sherwood
authors.forename: Njeri
authors.initials: N
authors.lastname: Karanja
authors.forename: Cheryl L
authors.initials: CL
authors.lastname: Rock
mesh_terms: D005260:Female; D005500:Follow-Up Studies; D006293:Health Promotion; D006801:Humans; D008875:Middle Aged; D009749:Nutrition Surveys; D009765:Obesity / Q000453:epidemiology / Q000378:metabolism / Q000534:rehabilitation*; D011446:Prospective Studies; D012306:Risk; D012890:Sleep; D012892:Sleep Deprivation / Q000150:complications* / Q000453:epidemiology / Q000378:metabolism; D013997:Time Factors; D016896:Treatment Outcome; D015431:Weight Loss