© Copyright 2013 Shervin S. Churchill Sleep and Activity Patterns of Children with Down Syndrome in Relation to Sleep Disordered Breathing
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© Copyright 2013 Shervin S. Churchill Sleep and Activity Patterns of Children with Down Syndrome in Relation to Sleep Disordered Breathing Shervin S. Churchill A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy University of Washington 2013 Reading Committee: Gail M. Kieckhefer, Chair Teresa M. Ward Kristie F. Bjornson Program Authorized to Offer Degree: School of Nursing University of Washington Abstract Sleep and Activity Patterns of Children with Down Syndrome in Relation to Sleep Disordered Breathing Shervin S. Churchill Chair of the Supervisory Committee: Professor Gail M. Kieckhefer Department of Family and Child Nursing Background and purpose: Sleep disordered breathing (SDB) is a major health problem in children with Down syndrome (DS), and may adversely affect not only health, but also accomplishment of life’s daily activities and habits. Obesity is a known risk factor of SDB in the general population, but in children with DS there have been conflicting reports on the role of obesity in SDB. The goal of this dissertation is to: 1) review the current state of knowledge in sleep of children with DS; 2) describe sleep patterns, and examine the relationship of sleep disturbances, including SDB, with the accomplishment of daily life habits; and 3) describe activity patterns, and evaluate the relationships between SDB, sleep duration, obesity and physical activity (PA) in a sample of children with DS. Methods: A review of the English language literature between 1960 and 2012 was completed, studies were described and synthesized. An Internet sample of 139 parents of children ages 5 to 18 years (110 parents of children with DS, 29 parents of children with typical development [TD]), completed a 45-minute online survey. The survey included previously tested and established subjective instruments on sleep characteristics; the Children’s Sleep Habits Questionnaire (CSHQ), the Life Habits Questionnaire (LIFE-H), and Children’s Physical Activity Questionnaire (CPAQ). Patterns of sleep, life habits accomplishment, and PA were described and compared between children with DS and TD. The associations of sleep indicators with life habits accomplishment, and SDB and sleep duration with obesity and PA were evaluated in a series of regression analyses. Results: The presence of SDB in a large proportion of children with DS is well documented in the literature. Sleep disturbances did impact the accomplishment of daily life habits over and above the impact of DS itself. The impact of SDB on life habits accomplishment figures prominently among eight measured domains of sleep disturbances. While children with DS had longer sleep duration compare with children with TD, SDB is a significant explanatory factor in duration of sleep among all children. Presence of SDB symptoms was associated with a 38- minute decrease in sleep duration (95% confidence interval [CI]: 12- 64 minute decrease, probability [p] =0.005). A dose response relationship was observed between overweight and SDB. Obese children (body mass index > 95th percentile) had almost a six-fold risk for presence of SDB symptoms (odds ratio [OR] =5.78, 95% CI=1.90-17.61, p=0.002). Every hour increase of moderate to vigorous PA was associated with a 13% reduction in risk of obesity (OR=0.87, 95% CI=0.78-0.96, p=0.006). Conclusions: SDB is a major contributor to compromised accomplishment of daily life habits in children with DS. Overweight and obesity are implicated in contributing to SDB. Interventions for increasing PA and reducing obesity in children with DS have the potential to decrease the symptoms of SDB and improve the accomplishment of life habits and life quality. Table of Contents List of Figures…………………………………………………………………………………......v List of Tables……………………………………………………………………………………..vi Acknowledgments………………………………………………………………………...…….viii Dedication………………………………………………………………………………………...ix Introduction……………………………………………………………………………………….1 References………………………………………………………………………………...2 Chapter 1: Sleep measurement and monitoring in children with Down syndrome: A review of the literature, 1960-2012………………………………………………………….…3 Abstract……………………………………………………………………………………4 Objective…………………………………………………………………………………..4 Introduction………………………………………………………………………………..5 Epidemiology of Down syndrome………………………………………………...5 Clinical characteristics of DS and relation to sleep……………………………….6 Methods……………………………………………………………………………………7 Style and selection criteria of review……………………………………………...7 Categories of studies and chronological order…………………………………….8 Findings…………………………………………………………………………………...8 Basic research—measurement of sleep architecture in relation to intellectual disability……………………………………………………….……..8 Applied research—measurement of obstructive sleep apnea, its prevalence and characteristics…………………………………..………………..11 Applied research—clinic-based research studies that evaluated treatment of OSA………………………………………………………………...12 Holistic research—studies that look at the overall health and comorbidities..…..13 i Parent report studies………………………………………………………….…13 Discussion………………………………………………………………………………14 Conclusions……………………………………………………………………………..18 Limitation of this review.……………………………………………………………….18 Practice points…………………………………………………………………………..18 Research Agenda………………………………………………………………………..19 Acknowledgments………………………………………………………………………20 References………………………………………………………………………………21 Tables 1.1 & 1.2………………………………….…………………….……………28-36 Appendices 1.A & 1.B…….………………………………………………………...37-38 Chapter 2: Relationship between Sleep Quality and Accomplishment of Daily Life Habits in Children with Down Syndrome…………………………………….……………39 Abstract………………………………………………………………………………….40 Introduction ……………………………………………………………………………..41 Key Questions……………………………………………………………………43 Methods…………………………………………………………………………………..43 Participant Recruitment and Data Collection …………………………………...44 Measures ………………………………………………………………………...45 Demographic and health characteristics…………………………………45 Sleep characteristics……………………………………………………..46 Accomplishment of daily life habits……………………………………..47 Statistical analysis ……………………………………………………………….48 Results……………………………………………………………………………………50 Demographic, health, and family characteristics………………………………...50 Sleep Patterns……………………………………………….……………………50 ii Description daily life habit domains …………………………………………….51 The association between sleep disturbance and accomplishment of daily life habits….……………………………………………………………….51 Bedtime resistance ………………………………………………………52 Sleep onset delay…………………………………………………………52 Sleep duration……………………………………………………………53 Sleep anxiety …………………………………………………………….53 Night wakings……………………………………………………………53 Parasomnias……………………………………………………………...54 Sleep disordered breathing ………………………………………………54 Daytime sleepiness ………………………………………………………55 Total CSHQ sleep disturbance score…………………………………….55 The role of SDB score among other sleep disturbance variables………..55 Discussion………………………………………………………………………………..56 Conclusions ……………………………………………………………………………...59 What this study adds……………………………………………………………..60 References………………………………………………………………………………..61 Figures 2.1 and 2.2………………………………………………………………….64 – 65 Tables 2.1 – 2.8 …………………………………………………………………….66 – 75 Chapter 3: Associations between Sleep Disordered Breathing Symptoms, Sleep Duration, Obesity and Physical Activity in Children and Adolescents with Down Syndrome…………….76 Abstract…………………………………………………………………………………..77 Introduction………………………………………………………………………………78 Key questions and hypotheses…………………………………………………...81 Methods………………………………………………………………………………….82 iii Participant recruitment and data collection………………………………………82 Measures………………………………………………………………………...84 Demographics, health characteristics and obesity………….……………84 Sleep characteristics………………………………………..…………….84 Physical activity…………………………………………..……………...86 Statistical analysis…………………………………………..……………………87 Results……………………………………………………………..……………………..88 Demographic, health and family characteristics…………..……………………..88 Sleep characteristics ……………………………………..………………………88 The association between SDBS and sleep duration (hypothesis 1)…..………….89 Physical activity characteristics…………………………………..……………...90 Proportion of children meeting the daily recommended amount of MVPA and related factors…………… ……...…………………….…90 The relationship, and sleep disordered breathing symptoms with physical activity (hypotheses 2a and 2b)………………………………………………….91 The relationship of physical activity (hypothesis 3)………..……..……………..92 The relationship of SDBS with obesity (hypothesis 4)………………..…………92 Discussion………………………………………………………………………..………93 Conclusions…………………………………………………………………………..…..98 References……………………………………………………………………..…………98 Figures 3.1 – 3.4………………………………………………………….………..103-105 Tables 3.1 – 3.8…………………………………………………………………….106-111 Appendices 3.A and 3.B…………………………………..…………………….…112-113 Chapter 4: Conclusions, practice implications, and direction for future research……………..114 iv List of Figures Figure Name Page Appendix 1.A. Life Expectancy of Individuals with Down Syndrome Compared with Life Expectancy in U.S. General Population ………………………37 Figure 2.1. Flow Chart of Survey Participants……………………………………….64 Figure 2.2. CSHQ Sleep Domain Scores by Study…………………………………..65 Figure 3.1. Conceptual Model Showing the Relationships Investigated…………...103 Figure 3.2. Mean SDB Score by Average Hours of Nightly Sleep…………………104 Figure 3.3. Mean SDB Score by Weight Category ………………………………...105 Figure 3.4. Percent of Presence of SDB Symptoms by Weight Category……….....105 v List of Tables Table Name Page Table 1.1. Studies of