Sleep Restriction and Energy Expenditure

Sleeping metabolic rate will be measured using a metabolic chamber on the night of day 2. During day 3, 24-hour energy expenditure (including a second night of measurement) will be measured in the metabolic chamber. On this day, the participant will perform 2 bouts of physical activity on a stationary bicycle for 15 minutes each bout. This will give us a measurement of physical activity energy expenditure. On day 4, at 7 am, the participant will exit the metabolic chamber and will enter a different, smaller metabolic chamber for the measurement of energy expenditure in response to a meal. This measurement will start at approximately 8 am with assessment of the resting metabolic rate (45 minutes). The participant will then be given a high-fat meal replacement to consume over 10 minutes. Energy expenditure measurements continue in the metabolic chamber for a 6-hour period.

Inclusion criteria

• Age 21-45 yrs
• Non-pregnant, non-lactating female subjects
• Body mass index (BMI) 25-28 kg/m2
• Weight stable (± 2.5 kg) for at least 3 mo prior to evaluation
• If a woman of child-bearing potential, must be willing to adhere to an acceptable form of contraception
• Non-smoker
• Regularly sleeps 7-8.5 hours/night
• If taking any form of medication, other than those listed in the exclusion criteria, must have been stable and remain on the same medication and medication dose throughout the study

Exclusion criteria

• Diabetes, uncontrolled hypertension
• Attempted to lose weight in past 3 months
• Eating disorder
• Stroke, seizure disorder, or other significant neurological disease;
• HIV positive by self-report
• Unstable or uncontrolled medical illness including active malignancies within past 5 yrs
• Untreated or unstable hypothyroidism
• Hyperthyroidism
• A score on the Brief Psychiatric Inventory that exceeds the 90th percentile;
• Subjects with psychoses, bipolar disorder, major depression, severe personality disorders, suicidal
• Alcohol or substance abuse in the past 6 mo
• Pregnant, planning pregnancy in the next 6 mo, or breast-feeding
• Participating in a commercial diet or behavior modification program (e.g., Weight Watchers), or plans to participate
• Shift worker, commercial long-distance driver, heavy equipment operator, history of drowsy driving
• Takes naps regularly
• Has traveled across time zones in the past 4 weeks or plans to during the weeks of the study
• Excessive caffeine intake