Sleep Restriction and Energy Expenditure
| Status: | Completed |
|---|---|
| Conditions: | Obesity Weight Loss |
| Therapuetic Areas: | Endocrinology |
| Healthy: | No |
| Age Range: | 21 - 45 |
| Updated: | 7/16/2013 |
| Start Date: | November 2011 |
| End Date: | April 2013 |
| Contact: | Ari Shechter, PhD |
| Email: | slrsleepstudy@gmail.com |
| Phone: | (212) 523-1602 |
The Effect of Sleep Reduction on Daily Energy Expenditure, Thermic Effect of Food, and Substrate Oxidation in Overweight Women
Each 4-day period will follow the same protocol. Basically, for the entire study, we will
prepare all of the subject's food and will require him or her to eat all of the food that we
give at the times we tell them to eat. The subject will arrive at the hospital on the
evening of day 1, and become inpatients. On day 2, the subject will be permitted to leave
the hospital campus under the supervision of the research staff. On day 3, they will be
required to stay in a small room called a metabolic chamber for 24 hours. This room
measures how many calories you burn in one day. On day 4, we will measure the subject's
energy expenditure in response to a breakfast meal. They will be given breakfast and the
number of calories that they burn after that meal will be measured over a 6-hour period.
Then the subject will be discharged at the end of the test. The 2 study periods will differ
only in bedtimes and wakeup times. During one period, the subject will go to bed at 1 am
and wake up at 5 am and during the other period they will go to bed at 11 pm and wake up at
7 am.
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
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