Effects of CPAP on Diet, Physical Activity, and Cardiovascular Risk

Study Overview
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Brief Summary
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Obstructive sleep apnea (OSA) is characterized by recurrent episodes of partial or complete loss of airflow during sleep, due to narrowing or closure of the upper airway. The resulting hypoxia has many cardiometabolic consequences, and leads to a disruption of sleep quality including reductions in the expression of rapid eye movement (REM) sleep and slow wave sleep (SWS). Patients also frequently experience excessive daytime sleepiness (EDS), which, when present with OSA, defines the clinical entity OSA syndrome (OSAS). Obesity is the leading risk factor for the development of OSA. Interestingly, it has been suggested that the disorder itself may contribute to further weight gain, presenting a vicious cycle wherein OSA and obesity perpetuate each other. OSAS may promote weight gain by placing patients in a state of positive energy balance characterized by low levels of physical activity and disrupted patterns of appetite-regulating hormones. Continuous positive airway pressure (CPAP), the gold-standard treatment of OSAS, may improve energy balance in these patients, although this has not yet been adequately studied. The current proposal will investigate the effects of 2 months of CPAP on energy balance and cardiovascular risk in obese patients with OSA. Patients will be instructed to use CPAP at home each night throughout the 2-month treatment phases. At baseline and at the conclusion of the 2-month treatment phase, the investigators will measure levels of free-living physical activity, sleepiness, sleep quality, body composition, cardiovascular risk factors, appetite-regulating hormones, hunger, and ad libitum food intake. There will also be a control group with OSA individuals studied at baseline and again after 2 months with no CPAP use. It is hypothesized that CPAP compared to no treatment treatment will result in improvements in energy balance, including increased physical activity, reductions in abnormally high levels of circulating leptin levels, and reductions in hunger, food intake, and cardiovascular risk factors. These improvements are hypothesized to be associated with increases in the expression of REM sleep and SWS, and reduced EDS as a result of CPAP.

Detailed Description
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This study investigates the effects of 2 mo of continuous positive airway pressure (CPAP) on physical activity, energy intake (EI), and cardiovascular risk factors in overweight/obese patients with obstructive sleep apnea (OSA). Patients will be instructed to use CPAP at home each night throughout the 2 mo treatment phase. Before and after the 2 mo treatment phase, patients will undergo a 1-d in-lab testing period at the Clinical Research Resource (CRR) at Columbia University Medical Center. Upon completion of the laboratory phase 1, patients will return home for a 2 mo treatment period, followed by the second tracking period including laboratory visit 2. Before and at the conclusion of the 2 mo treatment phase, patients will enter the laboratory at the Columbia University Medical Center for a 1-d period. Patients will arrive at  0800 h and will remain in the laboratory for the following 24 h. Blood will be sampled in the fasting state in the morning, and will be assayed for select appetite-regulating hormones (leptin, ghrelin, adiponectin, glucagon-like peptide-1). We will also assess body composition. During the laboratory day, ad libitum EI will be measured for each treatment phase. Breakfast, lunch, snack, and dinner will be served at the standard times, but each meal item will be served in excess such that patients will be able to eat as much or as little of each food as they choose. Additional snack choices will also be freely available during the wake episode. There will also be a control group of individuals with OSA who do not use CPAP who are studied at baseline and again after a 2 month period in procedures similar to those undergoing treatment.

Official Title
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Effects of CPAP on Diet, Physical Activity, and Cardiovascular Risk

Conditions
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Sleep Apnea Syndromes

Intervention / Treatment
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* Device: CPAP


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: clinical diagnosis of obstructive sleep apnea (OSA) and excessive daytime sleepiness (EDS) body mass index of at least 25 kg/m^2 Exclusion Criteria: prior treatment with CPAP shift workers type 2 diabetes poorly controlled severe hypertension anemia history of coronary artery disease, transient ischemic attack, stroke currently taking anti-psychotic, anti-depressive, or hypnotic medications females currently taking hormone replacement therapy females who are pregnant or have given birth within 1 year

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: treatment group: individuals with OSA using CPAP control group: individuals with OSA not using CPAP
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Intervention - CPAP use<br>Active CPAP will be a therapeutic dose of positive airway pressure each night for 2 months | Device: CPAP<br>* use of CPAP each night for 2 months<br>|
| No Intervention: Control - No CPAP use<br>Control will be no use of CPAP for 2 months | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Fat Mass (% of Total Body Mass) | Fat mass (% of total body mass) measured via BODPOD at baseline preceding treatment phase, and at the end of treatment phase. | At baseline (Pre) and after 2 months of treatment (Post) or control | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| ad Libitum Food Intake (Total Daily Calories Consumed) | Participants will be served meals (breakfast, lunch, dinner, snack) at specified times, but food will be served in excess such that participants will be able to eat as much as they want. | At baseline (Pre) and after 2 months (Post) of treatment or control | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Sleep Apnea, Obstructive, Energy Balance, Food Intake, Energy Expenditure, Sleep, Obesity