Perceived exercise limitation in asthma: The role of disease severity, overweight, and physical activity in children

Influence of parental anxiety and beliefs about medicines on feeding and exercise in children living with asthma

This study's primary objective was to establish differences in beliefs about medicines, levels of asthma-related anxiety and diet and exercise behaviours between parents of children with well controlled and poorly controlled asthma. Secondary objectives were to explore how asthma control might shape relationships between parental cognitions and parenting practices concerning paediatric asthma. Parents of children with asthma aged 10-16 years (N = 310) completed standardised questionnaires measuring beliefs about medicines, parental asthma-related anxiety, parenting attitudes towards child activity, parental feeding and asthma control. Parents of children with poorly controlled asthma reported significantly greater asthma medication necessity and concern, asthma-related anxiety, control of child activity, pressure to exercise and unhealthy feeding practices. Moderation analyses indicated that the relationship between parental concern about asthma medicine and parental control of child activity was strongest in children with poorly controlled asthma. Also, the relationship between parental asthma-related anxiety and use of food to regulate child emotion was only significant when asthma was poorly controlled. Parental beliefs about asthma medicines and asthma-related anxiety may indirectly influence asthma outcomes through unhealthy parenting practices around exercise and diet. Eliciting and understanding parents' perceptions of asthma medications and anxiety may facilitate personalised interventions to improve asthma control.

The longitudinal association between asthma severity and physical fitness among new York City public school youth

Severe persistent childhood asthma is associated with low physical activity and may be associated with poor physical fitness. Research on the asthma severity-fitness association longitudinally and across sociodemographic subgroups is needed to inform fitness interventions targeting youth with asthma. We evaluated the relationship between asthma severity (categorized as severe, mild, or no asthma) and subsequent fitness in New York City (NYC) public school youth enrolled in grades 4-12 using the NYC Fitnessgram dataset (2010-2018). Longitudinal mixed models with random intercepts were fit to test the association between asthma severity and one-year lagged fitness z-scores by clustering repeated annual observations at the student level. Models were adjusted for sex, race/ethnicity, grade level, poverty status, time, and stratified by sociodemographic factors. The analytic sample included 663,137 students (51% male; 31% non-Hispanic Black, 40% Hispanic; 55% in grades 4-8, 70% high poverty; 87%, 11% and 1% with no, mild, and severe asthma, respectively). Students with severe asthma and mild asthma demonstrated -0.19 (95% CI, -0.20 to -0.17) and - 0.10 (95% CI, -0.11 to -0.10), respectively, lower fitness z-scores in the subsequent year relative to students without asthma. After stratifying by demographics, the magnitude of the asthma severity-fitness relationship was highest for non-Hispanic white vs. all other racial/ethnic subgroups, and was similar across sex, grade level, and household poverty status. Overall, we observed an inverse longitudinal relationship between asthma severity and subsequent fitness among urban youth, particularly non-Hispanic Whites. Future research should examine how neighborhood-level factors impact the asthma severity-fitness relationship across racial/ethnic subgroups.

Cardiopulmonary fitness in children with asthma versus healthy children

OBJECTIVES

To evaluate, with a cardiopulmonary exercise test (CPET), the cardiopulmonary fitness of children with asthma, in comparison to healthy controls, and to identify the clinical and CPET parameters associated with the maximum oxygen uptake (VO_2max) in childhood asthma.

DESIGN

This cross-sectional controlled study was carried out in CPET laboratories from two tertiary care paediatric centres. The predictors of VO_2max were determined using a multivariable analysis.

RESULTS

A total of 446 children (144 in the asthma group and 302 healthy subjects) underwent a complete CPET. Mean VO_2max was significantly lower in children with asthma than in controls (38.6±8.6 vs 43.5±7.5 mL/kg/min; absolute difference (abs. diff.) of -4.9 mL/kg/min; 95% CI of (-6.5 to -3.3) mL/kg/min; p<0.01) and represented 94%±9% and 107%±17% of predicted values, respectively (abs. diff. -13%; 95% CI (-17 to -9)%; p<0.01). The proportion of children with an impaired VO_2max was four times higher in the asthma group (24% vs 6%, p<0.01). Impaired ventilatory efficiency with increased VE/VCO₂ slope and low breathing reserve (BR) were more marked in the asthma group. The proportion of children with a decreased ventilatory anaerobic threshold (VAT), indicative of physical deconditioning, was three times higher in the asthma group (31% vs 11%, p<0.01). Impaired VO_2max was associated with female gender, high body mass index (BMI), FEV1, low VAT and high BR.

CONCLUSION

Cardiopulmonary fitness in children with asthma was moderately but significantly altered compared with healthy children. A decreased VO_2max was associated with female gender, high BMI and the pulmonary function.

TRIAL REGISTRATION NUMBER

NCT04650464.

Physical Activity Among Urban Children with Asthma: Does Sleep Matter?

The present study examined associations between sleep and physical activity among a diverse sample of 97 urban children (ages 7-9) with persistent asthma. Differences in associations were evaluated by race/ethnicity and weight status. The extent to which sleep moderated the association between lung function and physical activity was also evaluated. Generalized linear models were utilized to examine associations. Findings indicated that, among the aggregate sample, more frequent nighttime awakenings were associated with less time spent engaging in moderate-to-vigorous physical activity (MVPA). Important differences in these associations were identified by both race/ethnicity and weight status. Better lung function was associated with, (a) higher levels of MVPA for children with better sleep efficiency and fewer nighttime awakenings, and (b) lower levels of MVPA for children with poorer sleep efficiency and more frequent nighttime awakenings. In short, sleep mattered with respect to children's physical activity levels in this sample.

Using projective exercises to identify patient perspectives of living with comorbid type 2 diabetes and asthma

OBJECTIVE

Patient self-management of a single chronic condition can be challenging, but few studies have examined the emotional impact of living with comorbid conditions and how that differs from a single chronic condition. This study examined patient perspectives of the emotional impact of living with asthma or asthma with comorbid type 2 diabetes (asthma+diabetes).

METHODS

Data were collected from 41 adults (asthma only n = 22, asthma+diabetes n = 19) using semi-structured interviews on two separate online bulletin boards. Respondents engaged in discussions that leveraged two projective exercises: describing their health condition(s) as an animal, and selecting one of eight images that best illustrated how they were living with and managing their health condition(s).

RESULTS

Respondents described physical and emotional challenges related to managing asthma or asthma+diabetes. Animal- and image- projective exercises were categorized by response and health condition. Thematic analysis across both projective exercises identified four themes: (1) frustrations with dual diagnosis, (2) juggling the dual diagnosis, (3) anticipating the future, and (4) unpredictability.

DISCUSSION

Projective exercises are one way to elicit feelings about living with chronic conditions. Healthcare providers can improve support for patients with more than one health condition by providing education on how to manage comorbid conditions.

Asthma and Physical Activity in Urban Children

OBJECTIVES 

Asthma and obesity disproportionately affect urban minority children. Avoidance of physical activity contributes to obesity, and urban children with asthma are at risk for lower levels of physical activity. We examined associations between lung function and moderate to vigorous physical activity (MVPA) and moderators of this association in a diverse sample of children with asthma.

METHODS 

Urban children (N = 142) ages 7-9 with persistent asthma and their caregivers completed a study of asthma and physical activity. Longitudinal mixed effects models examining daily-level asthma and physical activity evaluated the association between asthma and MVPA, and the moderating effect of weight, and cultural/contextual factors on this association.

RESULTS 

Average daily MVPA was below recommended guidelines. Differences in MVPA were found by racial/ethnic group (p = .04) and weight (p = .001). Poorer asthma status was associated with lower MVPA in Latino and Black participants (p's < .05), and in normal weight youth (p = .01). Body mass index (BMI) moderated the association between asthma and MVPA. Those with lower BMI had more optimal asthma status and higher MVPA levels, whereas associations attenuated for participants with higher BMI (p = .04). Caregivers' perceptions of neighborhood safety and fear of asthma were marginally associated with children's symptoms and MVPA: as perceptions of safety decreased and fear increased, associations between asthma and MVPA weakened (p's = .09 and .07, respectively).

CONCLUSIONS 

Suboptimal asthma status is associated with less MVPA in urban children. Weight status and cultural/contextual factors play a role in the association and are worthy targets for future research and intervention.

Diagnostic performance of the physical activity-related question of the GINA questionnaire to detect exercise-induced bronchoconstriction in asthma

INTRODUCTION

The aim of the study was to evaluate the diagnostic performance of the item concerning physical activity of the Global Initiative for Asthma (GINA) asthma control questionnaire for detection of exercise-induced bronchoconstriction (EIB) in children and adolescents.

MATERIAL AND METHODS

We divided participants (aged 6-18 years) with a diagnosis of asthma into two groups according to the GINA severity classification: mild/moderate asthma (MMA) and severe therapy-resistant asthma (STRA). We collected anthropometric, clinical and functional data (spirometry) and performed an EIB test. We used item 4 of the GINA questionnaire regarding exercise-induced symptoms to assess the diagnostic power of this instrument.

RESULTS

We included 40 patients (17 with MMA and 23 with STRA) with a mean age of 11.3 years and a mean FEV₁z-score of -0.33, of who 13 (32.5%) were classified as having uncontrolled asthma. Of the patients with uncontrolled asthma, 7 (53.8%) exhibited a decrease in the FEV₁ after the EIB test. We found a higher frequency of EIB in participants with FEV₁ z-score values of less than -1.0 compared to those with a z-score of -1.0 or greater (P = .05). There were no significant differences in the frequency of EIB based on disease severity and control. We also found no association of item 4 (GINA) with EIB. The area under the ROC curve demonstrated that the discriminative power of the GINA questionnaire for the detection of EIB is inadequate (P = .41), with sensitivity of 42.1% and specificity of 57.1%.

CONCLUSIONS

The item concerning physical activity in the GINA questionnaire has insufficient diagnostic power to detect EIB in children and adolescents with asthma.

[Diagnostic performance of the physical activity related question of the GINA questionnaire to detect exercise-induced bronchoconstriction in asthma]

INTRODUCTION

The aim of the study was to evaluate the diagnostic performance of the item concerning physical activity of the Global Initiative for Asthma (GINA) asthma control questionnaire for detection of exercise-induced bronchoconstriction (EIB) in children and adolescents.

MATERIAL AND METHODS

We divided participants (aged 6 to 18 years) with a diagnosis of asthma into two groups according to the GINA severity classification: mild/moderate asthma (MMA) and severe therapy-resistant asthma (STRA). We collected anthropometric, clinical and functional data (spirometry) and performed an EIB test. We used item 4 of the GINA questionnaire regarding exercise-induced symptoms to assess the diagnostic power of this instrument.

RESULTS

We included 40 patients (17 with MMA and 23 with STRA) with a mean age of 11.3 years and a mean FEV₁z-score of -0.33, of who 13 (32.5%) were classified as having uncontrolled asthma. Of the patients with uncontrolled asthma, 7 (53.8%) exhibited a decrease in the FEV₁ after the EIB test. We found a higher frequency of EIB in participants with FEV₁ z-score values of less than -1.0 compared to those with a z-score of -1.0 or greater (p = 0.05). There were no significant differences in the frequency of EIB based on disease severity and control. We also found no association of item 4 (GINA) with EIB. The area under the ROC curve demonstrated that the discriminative power of the GINA questionnaire for the detection of EIB is inadequate (p = 0.41), with sensitivity of 42.1% and specificity of 57.1%.

CONCLUSIONS

The physical activity related question of GINA has insufficient diagnostic power to detect EIB in children and adolescents with asthma.

Physical activity experiences of children and adolescents with asthma: a qualitative systematic review protocol

OBJECTIVE

The objective of the review is to synthesize existing knowledge about experiences of children and adolescents with asthma related to participation in, or limitation of, physical activity.

INTRODUCTION

Limitations of physical activity, expressed as a barrier of bodily movement, may relate to physiological restraints, as well as emotional and social delimitation, in children and adolescents with asthma. Participation in physical activity is related to management of asthma and is important for social inclusion. Through childhood and adolescence, physical activity enhances physical, cognitive, and social development, and a dose-response relationship between physical activity and several indicators of improved health has been established. Knowledge is needed about experiences of physical activity in children and adolescents with asthma to tailor care and implement exercise and physical activity supporting interventions into clinical practice.

INCLUSION CRITERIA

This review will consider qualitative studies that include subjective experiences related to participation in, or limitation of, physical activity in children and adolescents (six to 18 years of age) with asthma. All contexts and countries will be included.

METHODS

MEDLINE, Embase, PsycINFO, CINAHL, SPORTDiscus, SocINDEX, and Social Science Citation Index List will be searched for relevant studies. Studies published in English with no date limitation will be included. Study selection, assessment of methodological quality, data extraction, synthesis, and assessment of confidence in the findings will be conducted using the JBI meta-aggregation approach.

SYSTEMATIC REVIEW REGISTRATION NUMBER

PROSPERO CRD42020164797.

Motivation for physical activity in adolescents with asthma

OBJECTIVE

We explored motivation for physical activity (PA) and exercise in adolescents with asthma who entered and continued a 10-week play-based exercise intervention.

METHODS

Eighteen adolescents with asthma, aged 13-17 years, participated in a 10-week play- and interval-based indoor exercise intervention during winter and autumn months. Semi-structured focus group interviews were conducted in weeks 2 and 8, focusing on motivation for PA and exercise, as well as field observations of exercise sessions in weeks 2, 6, and 8. The first interview was analyzed separately from the second one and descriptive observational data were obtained using thematic analysis and self-determination theory as a framework.

RESULTS

In the first round of focus group interviews, participants (n = 18) described amotivation and motivation for PA within the following five themes: "teachers' lack of asthma knowledge", "embarrassment over asthma symptoms", "not being able to keep pace with peers", "seasonal challenges", and "mastering fun physical activities". Based on the second interview (n = 14) and descriptive observational data (n = 18), participants reported and revealed amotivation and motivation for PA within the following four themes: "understanding and relatedness", "social support", "competition", and "mastering fun activities".

CONCLUSION

We conclude that play-based exercises designed for groups of adolescents with asthma can support motivation for PA and exercise and reduce social and asthma-specific barriers.

The impact of exercise on asthma

PURPOSE OF REVIEW

Asthma is one of the most common chronic diseases in children and adults in developed countries around the world. Despite international treatment guidelines, poor asthma control remains a frequent problem leading to missed school and work, and emergency room visits and hospitalizations. Many patients with asthma report exercise as a trigger for their asthma, which likely leads to exercise avoidance as a means to control symptoms. Evolving research has suggested that routine exercise may actually help improve some aspects of asthma control. This review discusses the recent research addressing how routine exercise affects important asthma-related outcomes including symptoms, lung function and quality of life.

RECENT FINDINGS

Several systematic reviews and meta-analyses have been conducted in recent years, which strongly support the safety of routine exercise in children and adults with asthma. Exercise appears to favor improvements in aerobic fitness, asthma symptoms and quality of life, but results so far are less consistent in demonstrating improvements to lung function and airway hyperresponsiveness.

SUMMARY

In addition to routine management guidelines, clinicians should recommend for their patients with asthma routine exercise for its general health benefits and likely improvement in asthma symptoms and quality of life.

Exercise and Asthma

Asthma is a chronic lower respiratory disease that is very common worldwide, and its incidence is increasing year by year. Since the 1970s, asthma has become widespread, with approximately 300 million people affected worldwide and about 250,000 people have lost their lives. Asthma seriously affects people's physical and mental health, resulting in reduced learning efficiency, limited physical activities, and decreased quality of life. Therefore, raising awareness of the risk of asthma and how to effectively treat asthma have become important targets for the prevention and management of asthma in recent years. For patients with asthma, exercise training is a widely accepted adjunct to drug-based and non-pharmacological treatment. It has been recommended abroad that exercise prescriptions are an important part of asthma management.

Contribution of repeated infections in asthma persistence from preschool to school age: Design and characteristics of the PreDicta cohort

BACKGROUND

The PreDicta cohort was designed to prospectively evaluate wheeze/asthma persistence in preschoolers in association with viral/microbial exposures and immunological responses. We present the cohort design and demographic/disease characteristics and evaluate unsupervised and predefined phenotypic subgroups at inclusion.

METHODS

PreDicta is a 2-year prospective study conducted in five European regions, including children 4-6 years with a diagnosis of asthma as cases and healthy age-matched controls. At baseline, detailed information on demographics, asthma and allergy-related disease activity, exposures, and lifestyle were recorded. Lung function, airway inflammation, and immune responses were also assessed. Power analysis confirmed that the cohort is adequate to answer the initial hypothesis.

RESULTS

A total of 167 asthmatic children (102 males) and 66 healthy controls (30 males) were included. Groups were homogeneous in respect to most baseline characteristics, with the exception of male gender in cases (61%) and exposure to tobacco smoke. Comorbidities and number and duration of infections were significantly higher in asthmatics than controls. 55.7% of asthmatic children had at least one positive skin prick test to aeroallergens (controls: 33.3%, P = .002). Spirometric and exhaled nitric oxide values were within normal limits; only baseline FEV_0.5 and FEV₁ reversibility values were significantly different between groups. Viral infections were the most common triggers (89.2%) independent of severity, control, or atopy; however, overlapping phenotypes were also common. Severity and control clustered together in an unsupervised analysis, separating moderate from mild disease.

CONCLUSIONS

The PreDicta cohort presented no differences in non-asthma related measures; however, it is well balanced regarding key phenotypic characteristics representative of "preschool asthma".

The effect of obesity, weight gain, and weight loss on asthma inception and control

PURPOSE OF REVIEW

There is ample and growing evidence that obesity increases the risk of asthma and morbidity from asthma. Here, we review recent clinical evidence supporting a causal link between obesity and asthma, and the mechanisms that may lead to 'obese asthma'.

RECENT FINDINGS

Although in some children obesity and asthma simply co-occur, those with 'obese asthma' have increased asthma severity, lower quality of life, and reduced medication response. Underlying mechanistic pathways may include anatomical changes of the airways such as obstruction and dysanapsis, systemic inflammation, production of adipokines, impaired glucose-insulin metabolism, altered nutrient levels, genetic and epigenetic changes, and alterations in the airway and/or gut microbiome. A few small studies have shown that weight loss interventions may lead to improvements in asthma outcomes, but thus far research on therapeutic interventions for these children has been limited.

SUMMARY

Obesity increases the risk of asthma - and worsens asthma severity or control - via multiple mechanisms. 'Obese asthma' is a complex, multifactorial phenotype in children. Obesity and its complications must be managed as part of the treatment of asthma in obese children.