Authors: (including presenting author): :
THY Ting(1) SHY Chan(1), EKH Luk(1), QMY To(1), CY Wong(1), KL CHOO(2)
Affiliation: :
(1) Dietetics Department, North District Hospital, Hong Kong, China (2) Department of Medicine, North District Hospital, Hong Kong, China
Introduction: :
Fifty-eight percent moderate to severe obstructive sleep apnea (OSA) in adults are obese. Studies have proven that OSA patients are more prone to develop cardiovascular disease and metabolic disorders. Lifestyle modification program is recommended for all overweight OSA adults to improve airway patency during sleep.
Objectives: :
This review investigated the effectiveness of a weight management program using an indirect calorimeter to estimate the basal energy requirement for OSA adults in a Hong Kong acute hospital.
Methodology: :
Seventeen obese OSA patients (BMI≥30kg/m2) with mean age of 49 year-old (SD±9.9 years) were recruited to attend an intensive weight management program from Jan to Dec 2018. Indirect calorimeter was used in the first assessment to accurately measure their basal energy expenditure (BEE). Bioelectrical impedance analysis was used to collect the body weight, body fat percentage (Fat %), and fat free mass (FFM). Mean weight of the intervention group was compared with the historical control group (n=17), Fat %, FFM, and waist circumference (WC) were compared before and after the intervention.
Result & Outcome: :
The weight lost is significantly higher in the intervention group (IG). The baseline and post-test mean weight of the IG are 107.0±26kg and 105.0±24.9kg respectively (p< 0.01). Whereas the baseline and post-test mean weight of the control group are 93.2±19.4kg and 93.6±19.2kg respectively (p=0.48). Fat % in the IG is significantly lowered at the post-intervention (baseline 41.8±10.8%, post-test 40.7±11.5%, p< 0.01). The FFM is significantly corrected with the BEE of the OSA patients in this pilot (p=0.038, r=0.48). Using an indirect calorimeter can accurately estimate the basal energy expenditure for designing an effective diet plan for OSA patients. Lifestyle modification that can increase FFM may have a positive effect on the BEE of the OSA patients. A longitudinal study is recommended to investigate the sustainability of similar lifestyle modification program for OSA adults.
