Abstract
Purpose
Consistent predictors of weight loss outcomes with very low-energy diets (VLEDs) in obstructive sleep apnea (OSA) have not been identified. This study aimed to identify variables predictive of weight loss success in obese patients with OSA undertaking an intensive weight loss programme.
Methods
We analysed biological, psychological, and behavioural variables as potential predictors of weight loss in obese patients with OSA after a 2-month VLED followed by one of two 10-month weight loss maintenance diets. Actigraphy, in-lab polysomnography, urinary catecholamines, and various psychological and behavioural variables were measured at baseline, 2, and 12 months. Spearman’s correlations analysed baseline variables with 2-month weight loss, and 2-month variables with 2–12 month-weight change.
Results
Forty-two patients completed the VLED and thirty-eight completed the maintenance diets. Actigraphy data revealed that late bedtime (rs = − 0.45, p = < 0.01) was correlated with 2-month weight loss. The change in the time that participants got out of bed (rise-time) from baseline to two months was also correlated with 2-month weight loss (rs = 0.36, p = 0.03). The Impact of Weight on Quality of Life-Lite questionnaire (IWQOL) Public Distress domain (rs = − 0.54, p = < 0.01) and total (rs = − 0.38, p = 0.02) scores were correlated with weight loss maintenance from 2 to 12 months.
Conclusions
Results from this small patient sample reveal correlations between actigraphy characteristics and weight loss in obese patients with OSA. We suggest the IWQOL may also be a useful clinical tool to identify OSA patients at risk of weight regain after initial weight loss.
Clinical trial registration
This clinical trial was prospectively registered on 18/02/2013 with the Australia and New Zealand Clinical Trials Registry (ACTRN12613000191796).
Public Registry Title
Sleep, Lifestyle, Energy, Eating, Exercise Program for the management of sleep apnea patients indicated for weight loss treatment: A randomised, controlled pilot study.
URL
https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=363680
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Data availability
Ethical approval was not granted to release participants’ raw data to third parties. We are happy to provide summaries of data collected in the trial upon request.
Code availability
No custom code was created for the analysis of this trial’s data. Statistical analysis was performed with standard medical statistics software (see ‘Methods’).
Abbreviations
- AGHE:
-
Australian Guide to Healthy Eating
- AHI:
-
Apnea-hypopnea index
- AUSNUT:
-
Australian Food, Supplement and Nutrient Database
- BMI:
-
Body mass index
- CPAP:
-
Continuous positive airway pressure
- EAC:
-
Elizabeth A. Cayanan
- IWQOL:
-
Impact of Weight on Quality of Life-Lite questionnaire
- LGHP:
-
Low Glycemic Index High-Protein
- NC:
-
North Carolina
- OSA:
-
Obstructive sleep apnea
- PA:
-
Pennsylvania
- SAS:
-
Statistical Analysis Software
- USA:
-
United States of America
- VLED:
-
Very low-energy diet
- WASO:
-
Wake after sleep onset
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Funding
This trial was funded through the National Health and Medical Research Council (NHMRC) Centre for Integrated Research and Understanding of Sleep (CIRUS) Centre of Research Excellence (571421). Dr Camilla Hoyos is funded by a NHMRC-ARC Dementia Research Development Fellowship (APP1104003).
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Study design: TJA, NSM, CMH, CLP, BJY, RRG, EAC. Data analysis, interpretation of data, and manuscript preparation: TJA, DJB, NSM, CMH, CLP, CB, AK, AM, YS, KKHW, BJY, RRG, EAC. All authors have seen and approved the manuscript.
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Ethics approval
Approval was granted by the Sydney Local Health District-Ethics Review Committee (RPAH Zone), Research Development Office, Royal Prince Alfred Hospital, CAMPERDOWN NSW 2050 on 13/12/2012. Ethics approval number: HREC/12/RPAH/533.
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All participants freely gave written informed consent to participate.
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All participants gave informed consent for publication of the results of this trial, and ethics approval included permission to publish in indexed, peer-reviewed medical journals.
Institutions where the work was performed
Woolcock Institute of Medical Research, 431 Glebe Point Rd, Glebe, New South Wales, Australia, 2037.
Royal Prince Alfred Hospital Department of Respiratory and Sleep Medicine, Level 11, Main Building (Building 75), Missenden Road, Camperdown, New South Wales, Australia, 2050.
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The authors declare no competing interests.
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Altree, T.J., Bartlett, D.J., Marshall, N.S. et al. Predictors of weight loss in obese patients with obstructive sleep apnea. Sleep Breath 26, 753–762 (2022). https://doi.org/10.1007/s11325-021-02455-4
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DOI: https://doi.org/10.1007/s11325-021-02455-4