Browsing by Author "Jelalian, Elissa"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Effect of changes in children's bedtime and sleep period on targeted eating behaviors and timing of caloric intake
    (Elsevier, 2022) Hart, Chantelle N.; Spaeth, Andrea M.; Egleston, Brian L.; Carskadon, Mary A.; Raynor, Hollie A.; Jelalian, Elissa; Owens, Judith A.; Considine, Robert V.; Wing, Rena R.; Medicine, School of Medicine
    Short sleep is associated with obesity risk. Experimental studies with adults and observational studies with children demonstrate that changes in eating, including increased caloric intake from energy-dense foods and sugar-sweetened beverages as well as increased caloric intake in the evening, may partially account for this increased risk. We therefore examined whether experimental changes in children’s sleep period lead to changes in reported caloric intake from energy-dense snack foods and sugar-sweetened beverages, and in the evening. Thirty-seven children, 8–11 years old, completed a three-week study that used a within-subject randomized cross-over design. Children slept their typical amount for one week and were subsequently randomized to either increase or decrease their typical amount by 1.5 hours/night for one week; the alternate schedule was completed during the third week of the study, creating a 3-hour time in bed difference between the increase and decrease conditions. Sleep was monitored with actigraphy, and dietary intake was assessed with 24-hour dietary recalls. Participants reported consuming 35 calories per day more from sugar-sweetened beverages during the decrease sleep than the increase sleep condition, p = .033. There were no reported differences between conditions from energy-dense snack foods. Although no differences in reported intake were observed earlier in the day, from 2000 h (8:00PM) and later, children reported consuming 132 calories more during the decrease sleep condition than the increase condition, p < 0.001. Shortened sleep achieved by delaying bedtimes led to increased caloric intake in the evening and from sugar-sweetened beverages.
  • Thumbnail Image
    Item
    Effect of Experimental Change in Children’s Sleep Duration on Television Viewing and Physical Activity
    (Wiley, 2016) Hart, Chantelle N.; Hawley, Nicola; Davey, Adam; Carskadon, Mary; Raynor, Hollie; Jelalian, Elissa; Owens, Judith; Considine, Robert; Wing, Rena R.; Department of Medicine, School of Medicine
    Background Paediatric observational studies demonstrate associations between sleep, television viewing and potential changes in daytime activity levels. Objective(s) To determine whether experimental changes in sleep lead to changes in children's sedentary and physical activities. Methods Using a within-subject counterbalanced design, 37 children 8–11 years old completed a 3-week study. Children slept their typical amount during a baseline week and were then randomized to increase or decrease mean time in bed by 1.5 h/night for 1 week; the alternate schedule was completed the final week. Children wore actigraphs on their non-dominant wrist and completed 3-d physical activity recalls each week. Results Children reported watching more television (p < 0.001) and demonstrated lower daytime actigraph-measured activity counts per epoch (p = 0.03) when sleep was decreased (compared with increased). However, total actigraph-measured activity counts accrued throughout the entire waking period were higher when sleep was decreased (and children were awake for longer) than when it was increased (p < 0.001). Conclusion(s) Short sleep during childhood may lead to increased television viewing and decreased mean activity levels. Although additional time awake may help to counteract negative effects of short sleep, increases in reported sedentary activities could contribute to weight gain over time.