|dc.description.abstract||Background: Sleep disorder is one of the leading risk factors for obesity and vice versa, and it is estimated that approximately one-third of the adult population has insufficient sleep. Time-Restricted Eating (TRE) and High-Intensity Interval Training (HIT) have shown to be both feasible and effective strategies to induce weight-loss and improve metabolic health. The effects TRE and HIT have on sleep quality are still unclear.
Objective: Determine the isolated and combined effects of 7 weeks of TRE and HIT on subjective- and objective sleep quality and sleep duration among women with overweight/obesity.
Methods: A single-center randomized controlled trial with allocation 1:1:1:1 to four parallel groups. Ninety-three women (18-45 years) with a BMI ≥27 kg/m2 were randomly allocated to either (1) TRE with a daily eating-window of ≤10 hours and ad libitum energy intake, (2) HIT comprising supervised exercise three times weekly (two 4x4 min and one 10x1 min sessions), (3) TREHIT, a combined intervention of TRE and HIT, or (4) a non-intervention control group. Sleep quality and sleep duration were estimated with the Pittsburgh Sleep Quality Index (PSQI) and BodyMedia Sensewear Armband (BSA) activity monitors at baseline and at the end of the 7-week study period.
Results: Subjective sleep quality improved in all groups from pre- to post-assessment with no statistically significant difference between the intervention groups and the control group. Changes in other subjective sleep parameters did not differ between any of the intervention groups versus the control group. No differences were found in objective- sleep duration and sleep efficiency. Participants with poor subjective sleep quality at baseline improved sleep quality significantly from pre to post in TRE (p=.011), HIT (p=.047) and the control group (p=.030), but with no between-group differences. Sleep quality in participants with good sleep at baseline decreased significantly in the HIT group compared to the control group (p=.028).
Conclusion: Seven weeks of TRE, HIT, or TREHIT did not improve sleep quality or sleep duration in women with overweight or obesity, compared to a no-intervention control group. There was no effect of the interventions on sleep quality among participants who had poor sleep quality at baseline.
Trial registration: Registered in Clinicaltrials.gov, registration number: NCT04019860.
Keywords: Sleep quality; Time-restricted eating; High-intensity interval training; Obesity; Overweight; Sleep disorder.||