Prolonged Sleep Restriction May Increase Body Weight - Summary - MDSpire
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Prolonged Sleep Restriction May Increase Body Weight
In a pooled analysis of two randomized crossover trials, reducing nightly sleep by about 1.5 hours for 6 weeks was associated with modest increases in body weight and waist circumference without measurable changes in body composition.
To investigate the effects of sleep restriction on body weight and related metabolic factors in adults at elevated cardiometabolic risk.
Approach:
Study Design: Pooled analysis of two randomized crossover trials involving 95 adult participants aged 20 years or older who habitually slept at least 7 hours per night.
Intervention: Participants underwent two 6-week outpatient intervention periods: one with adequate sleep (≥7 hours) and one with sleep restriction (delayed bedtime by 1.5 hours).
Monitoring: Sleep was monitored using wrist actigraphy and sleep diaries.
Outcomes: Primary outcomes included body weight, waist circumference, and body composition; secondary outcomes included appetite-related hormones, sedentary behavior, physical activity, and energy expenditure.
Key Findings:
Sleep restriction led to a mean increase of 0.45 kg in body weight and 0.52 cm in waist circumference.
Participants engaged in 17 more minutes of sedentary behavior during the sleep restriction period.
Higher fasting leptin concentrations were observed during sleep restriction.
No significant differences were found in body composition or levels of certain appetite-related hormones.
Sleep restriction was associated with a mean increase of 0.56 L in whole-body volume.
Interpretation:
Sustained moderate sleep restriction may contribute to modest weight gain among individuals at elevated cardiometabolic risk.
Limitations:
The 6-week intervention may have been too brief to detect meaningful changes in body composition.
The relatively small sample size limited subgroup analyses and generalizability.
Fasting metabolic measurements did not capture hormonal changes across the full 24-hour cycle.
Conclusion:
Longer-term studies are needed to determine if changes in body weight due to sleep restriction result in measurable alterations in body composition.
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