Fitness and physical activity in children with asthma

Assessment of the Physical Activity of Children with Asthma Bronchiale

Physical activity is an especially important part of everyday life for children with chronic diseases. The aim of the study was to show whether asthma is a barrier to physical activity in our society. The correlations between the severity of the disease, body mass index, and physical activity were analyzed, and parents' opinions on whether children should participate in active sports were assessed. Physical activity of children with asthma was analyzed by questionnaires; 93 parents and their 93 children were involved in the survey. The age of children was 12.6 ± 3.5 years (mean ± SD), 69.9% were boys, 30.1% were girls. A total of 93.4% of the respondents participated in a physical education program and 56.5% also attended sporting activities on a regular basis. In terms of disease severity, 61.2% of the children had mild asthma, 37.6% moderate, and 1.2% severe, and 6.5% of the respondents also stated that their children's illness had been consistently or frequently limiting their performance concerning their school or home duties over the past four weeks. Of the parents surveyed, 12% felt that physical activity was not appropriate in the context of this disease. We concluded that fear of the consequences of physical activity depends largely on education, which should involve parents, teachers, and coaches.

Asthma Prevalence among Athletes in an Urban Adolescent Population

OBJECTIVE

To identify individuals at risk of asthma by assessing the prevalence of asthma in an urban, athletic adolescent population using preparticipation physical evaluation (PPE) data.

STUDY DESIGN

Using the Athlete Health Organization (AHO) PPE data from 2016 to 2019, asthma prevalence was collected by reported diagnosis in the history or physical. Chi-square tests and logistic regression were performed to characterize the relationship between asthma and social factors such as race, ethnicity, and income. Control variables such as age, body mass index, blood pressure, sex, and family history were also collected.

RESULTS

Over 2016-2019, 1,400 athletes ranging from 9 to 19 years of age had completed PPEs (Table 1). A large percentage of student-athletes were found to have asthma (23.4%), of whom a majority 86.3% resided in low-income zip-codes. Additionally, 65.5% of athletes with asthma identified as Black, with race being associated with asthma prevalence (p < 0.05). Demographic factors like income, age, and gender were not significantly associated with asthma prevalence.

CONCLUSIONS

Self-identified Black individuals reported higher prevalence of asthma when compared to the general population. Identifying factors like race and income that place adolescent athletes at risk of asthma is a key step to understanding the complex relationship between asthma and social determinants of health. This work advances the conversation for establishing best practices for serving vulnerable populations, as seen in this urban population of children with asthma.

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.

A Meta-Analysis of Sampled Maximal Aerobic Capacity Data for Boys Aged 11 Years Old or Less Obtained by Cycle Ergometry

The aim of this study was to develop distributions of VO_2max based on measured values that exist in the literature in prepubertal boys using cycle ergometry. PRISMA guidelines were followed in conducting this research. One database was searched for peak and maximal VO₂ values in healthy boys with mean age under 11 years old. Data were split into articles reporting absolute and relative VO_2max values and analyzed accordingly. Multilevel models grounded in Bayesian principles were used. We investigated associations between VO_2max and body mass, year of the study, and country of origin. Differences in "peak" and "maximal" VO₂ were assessed. Absolute VO_2max (Lmin^-1) increases with age (P ~100%) but mean relative VO_2max does not change (P ~100%). Absolute VO_2max is higher in more recent studies (P = 95.7 ± 0.3%) and mean relative VO_2max is lower (P = 99.6 ± 0.1%). Relative VO_2max in the USA is lower compared with boys from other countries (P = 98.8 ± 0.2%), but there are no differences in absolute values. Mean aerobic capacity estimates presented as "peak" values are higher than "maximal" values on an absolute basis (P = 97.5 ± 0.3%) but not on a relative basis (P = 99.6 ± 0.1%). Heavier boys have lower cardiorespiratory fitness (P ≈ 100%), and body mass seems to be increasing faster with age in the USA compared with other countries (P = 92.3 ± 0.3%). New reference values for cardiorespiratory fitness are presented for prepubertal boys obtained with cycle ergometry. This is new, as no reference values have been determined so far based on actual measured values in prepubertal boys. Aerobic capacity normalized to body weight does not change with age. Cardiorespiratory fitness in prepubertal boys is declining, which is associated with increasing body mass over the last few decades. Lastly, this study did not find any statistically significant difference in the sample's mean aerobic capacity estimates using the "peak" and "maximum" distinctions identified in the literature.

Epinephrine evokes shortening of human airway smooth muscle cells following β2 adrenergic receptor desensitization

Epinephrine (EPI), an endogenous catecholamine involved in the body's fight-or-flight responses to stress, activates α1-adrenergic receptors (α1ARs) expressed on various organs to evoke a wide range of physiological functions, including vasoconstriction. In the smooth muscle of human bronchi, however, the functional role of EPI on α1ARs remains controversial. Classically, evidence suggests that EPI promotes bronchodilation by stimulating β2-adrenergic receptors (β2ARs). Conventionally, the selective β2AR agonism of EPI was thought to be, in part, due to a predominance of β2ARs and/or a sparse, or lack of α1AR activity in human airway smooth muscle (HASM) cells. Surprisingly, we find that HASM cells express a high abundance of ADRA1B (the α1AR subtype B) and identify a spontaneous "switch-like" activation of α1ARs that evokes intracellular calcium, myosin light chain phosphorylation, and HASM cell shortening. The switch-like responses, and related EPI-induced biochemical and mechanical signals, emerged upon pharmacological inhibition of β2ARs and/or under experimental conditions that induce β2AR tachyphylaxis. EPI-induced procontractile effects were abrogated by an α1AR antagonist, doxazosin mesylate (DM). These data collectively uncover a previously unrecognized feed-forward mechanism driving bronchospasm via two distinct classes of G protein-coupled receptors (GPCRs) and provide a basis for reexamining α1AR inhibition for the management of stress/exercise-induced asthma and/or β2-agonist insensitivity in patients with difficult-to-control, disease subtypes.

Physical activity in asthma control and its immune modulatory effect in asthmatic preschoolers

BACKGROUND

The impact of physical activity on immune response is a hot topic in exercise immunology, but studies involving asthmatic children are scarce. Our aims were to examine whether there were any differences in the level of physical activity and daily TV attendance, to assess its role on asthma control and immune responses to various immune stimulants.

METHODS

Weekly physical activity and daily television attendance were obtained from questionnaires at inclusion of the PreDicta study. PBMC cultures were stimulated with phytohemagglutinin (PHA), R848, poly I:C, and zymosan. A panel of cytokines was measured and quantified in cell culture supernatants using luminometric multiplex immunofluorescence beads-based assay.

RESULTS

Asthmatic preschoolers showed significantly more TV attendance than their healthy peers (58.6% vs. 41.5% 1-3 h daily and only 25.7% vs. 47.2% ≤1 h daily) and poor asthma control was associated with less frequent physical activity (PA) (75% no or occasional activity in uncontrolled vs. 20% in controlled asthma; 25% ≥3 times weekly vs. 62%). Asthmatics with increased PA exhibited elevated cytokine levels in response to polyclonal stimulants, suggesting a readiness of circulating immune cells for type 1, 2, and 17 cytokine release compared to subjects with low PA and high TV attendance. This may also represent a proinflammatory state in high PA asthmatic children. Low physical activity and high TV attendance were associated with a decrease in proinflammatory cytokines. Proinflammatory cytokines were correlating with each other in in vitro immune responses of asthmatic children, but not healthy controls, this correlation was more pronounced in children with sedentary behavior.

CONCLUSION

Asthmatic children show more sedentary behavior than healthy subjects, while poor asthma control is associated with a substantial decrease in physical activity. Our results suggest that asthmatic children may profit from regular exercise, as elevated cytokine levels in stimulated conditions indicate an immune system prepared for responding strongly in case of different types of infections. However, it has to be considered that a hyperinflammatory state in high PA may not be beneficial in asthmatic children.

Recommendations for Physical Activity in Asthma: A Work Group Report of the AAAAI Sports, Exercise, and Fitness Committee

Regular physical activity not only improves general health but also can positively impact asthma outcomes, such as control and quality of life. Despite this, many asthma patients do not engage in regular physical activity because they mistakenly believe that they should restrict exercise participation. Health care providers have an opportunity to influence the physical activity levels of their patients during regular office visits. Nonetheless, health care providers often overlook physical activity counseling as an adjunct to pharmacological therapy in asthma patients, and in particular, overlook physical activity counseling. Some providers who acknowledge the benefits of physical activity report being unaware how to approach a conversation with patients about this topic. To address these issues, members of the Sports, Exercise, and Fitness Committee of the American Academy of Allergy, Asthma, and Immunology (AAAAI) performed a focused literature search to identify and evaluate the effects of physical activity in patients with asthma. The purpose of this report is to summarize the evidence for physical activity's impact on asthma patients' disease control, pulmonary function, and overall well-being. Several subpopulations of patients with asthma, including children, adolescents, and older adults, are considered individually. In addition, this report offers practical recommendations for clinicians, including how to identify and overcome barriers to counseling, and methods to incorporate physical activity counseling into asthma treatment practice.

Comparison of physical fitness between healthy and mild-to-moderate asthmatic children with exercise symptoms: A cross-sectional study

OBJECTIVE

Asthma is a chronic disease that may affect physical fitness, although its primary effects on exercise capacity, muscle strength, functionality and lifestyle, in children and adolescents, are still poorly understood. This study aimed to evaluate the differences in cardiorespiratory fitness, muscle strength, lifestyle, lung function, and functionality between asthmatics with exercise symptoms and healthy children. In addition, we have analyzed the association between clinical history and the presence of asthma.

STUDY DESIGN

Cross-sectional study including 71 patients with a diagnosis of asthma and 71 healthy children and adolescents (7-17 years of age). Anthropometric data, clinical history, disease control, lifestyle (KIDMED and physical activity questionnaires), lung function (spirometry), exercise-induced bronchoconstriction test, aerobic fitness (cardiopulmonary exercise test), muscle strength and functionality (timed up and go; timed up and down stairs) were evaluated.

RESULTS

Seventy-one patients with asthma (mean age 11.5 ± 2.7) and 71 healthy subjects (mean age 10.7 ± 2.5) were included. All asthmatic children had mild to moderate and stable asthma. EIB occurred in 56.3% of asthmatic children. Lung function was significantly (p < .05) lower in the asthmatic group when compared to healthy peers, as well as the cardiorespiratory fitness, muscle strength, lifestyle and functionality. Moreover, asthmatic children were more likely to have atopic dermatitis, allergic reactions, food allergies, and a family history of asthma when compared to healthy children.

CONCLUSIONS

Children with mild-to-moderate asthma presenting exercise symptoms show a reduction in cardiorespiratory fitness, muscle strength, lung function, functionality, and lifestyle when compared to healthy peers. The study provides data for pediatricians to support exercise practice aiming to improve prognosis and quality of life in asthmatic children.

The Association between Vigorous Physical Activity and Stress in Adolescents with Asthma

Asthma is a very common condition that affects 5-10% of the global population, and its prevalence is increasing. Vigorous physical activity (PA) is effective in improving cardiorespiratory fitness and managing stress. This study aimed to investigate the association between vigorous PA and stress among Korean adolescents with asthma using large-scale survey data. The questionnaire data of 57,303 adolescents were analyzed using raw data from the 2019 Korea Youth Risk Behavior Web-Based Survey. We performed logistic regression analysis to calculate the stress odds ratios (ORs) and 95% confidence intervals (CIs) for asthma and non-asthma groups using models 1 and 2. We also performed logistic regression analysis to calculate the stress OR for the asthma group with vigorous PA and non-vigorous PA using models 1, 2, and 3. Model 1 was adjusted for age, sex, obesity, smoking, and alcohol status; model 2 was further adjusted for household income, academic achievement, and comorbidities. Model 3 was further adjusted for moderate activity and resistance exercise. The OR of stress was 20% higher in the asthma group than in the non-asthma group (p < 0.05). In the fully adjusted models, the OR for the non-asthma group with vigorous PA versus non-vigorous PA was 0.89 (95% CI: 0.84-0.94). However, the OR for the asthma group with vigorous PA versus non-vigorous PA was 0.70 (95% CI: 0.57-0.86), indicating that adolescents who engage in vigorous PA had lower stress in the asthma group (p < 0.05). This study demonstrated that adolescents with asthma had higher stress levels than those without asthma; however, vigorous PA was associated with lower stress. These effects were more pronounced in adolescents with asthma.

Physical activity and sedentary time in children and adolescents with asthma: A systematic review and meta-analysis

The influence of asthma on physical activity (PA) in youth remains equivocal. This review synthesizes the evidence regarding the influence of asthma on PA and sedentary time and evaluates the role of key moderators for this relationship. In accordance with PRISMA guidelines, six electronic databases and gray literature were searched. Primary studies in English were included if they reported device-assessed PA in youth with and without asthma. Random effects meta-analyses examined the effect of asthma on PA and, separately, sedentary time. Mixed-effect meta-regression analyses were conducted using age and sex as moderators, with sub-group comparisons for study quality and asthma diagnosis criteria. Overall, of 3944 citations retrieved, 2850 were screened after the removal of supplication and 2743 citations excluded. Of the 107 full-text publications reviewed, 16 were included in data extraction and analysis, with 15 and five studies included in the PA and sedentary time meta-analyses, respectively. The robust effect size estimate for the influence of asthma on PA and sedentary time was -0.04 [95% CI = -0.11, 0.03] and -0.09 [95% CI = -0.12, -0.06], indicating a non-significant and significant trivial effect, respectively. The effect of asthma on PA levels or sedentary time was not associated with age or sex. Youth with controlled asthma are equally physically (in)active as their healthy peers, with asthma associated with less sedentary time. However, methodological limitations and a paucity of clear methodological reporting temper these conclusions. More rigorous device-based assessments, with a particular focus on sedentary time, and more robust diagnoses of asthma, especially with regard to severity, are needed.

Determinants of exercise capacity in children and adolescents with severe therapy-resistant asthma

OBJECTIVE

To evaluate the exercise capacity of children and adolescents with severe therapy resistant asthma (STRA) aiming to identify its main determinants.

METHODS

Cross-sectional study including individuals aged 6-18 years with a diagnosis of STRA. Clinical (age and gender), anthropometric (weight, height and body mass index) and disease control data were collected. Lung function (spirometry), cardiopulmonary exercise testing (CPET) and exercise-induced bronchoconstriction (EIB) test were performed.

RESULTS

Twenty-four patients aged 11.5 ± 2.6 years were included. The mean forced expiratory volume in one second (FEV₁) was 91.3 ± 9.2%. EIB occurred in 54.2% of patients. In CPET, the peak oxygen uptake (VO_2peak) was 34.1 ± 7.8 mL kg^-1 min^-1. A significant correlation between ventilatory reserve and FEV₁ (r = 0.57; p = 0.003) was found. Similarly, there was a significant correlation between CPET and percent of FEV₁ fall in the EIB test for both V_E/VO₂ (r = 0.47; p = 0.02) and V_E/VCO₂ (r = 0.46; p = 0.02). Patients with FEV₁<80% had lower ventilatory reserve (p = 0.009). In addition, resting heart rate correlated with VO_2peak (r=-0.40; p = 0.04), V_E/VO₂ (r = 0.46; p = 0.02) and V_E/VCO₂ (r = 0.48; p = 0.01).

CONCLUSIONS

Exercise capacity is impaired in approximately 30% of children and adolescents with STRA. The results indicate that different aspects of aerobic fitness are influenced by distinct determinants, including lung function and EIB.

Effect of a combined exercise program on physical fitness, lung function, and quality of life in patients with controlled asthma and exercise symptoms: A randomized controlled trial

BACKGROUND

Asthmatic patients may benefit from exercise training, although the effects of a combined aerobic and resistance training program are still poorly investigated in children and adolescents.

OBJECTIVE

To analyze the effects of a combined exercise training (resistance and aerobic) program on aerobic fitness, lung function, asthma control and quality of life in a group of mild-moderate asthmatic children with exercise symptoms.

METHODS

This was a 12-week randomized controlled trial including children and adolescents diagnosed with mild-moderate asthma and presenting exercise-induced symptoms. The intervention group (IG) performed the exercise training (resistance and aerobic) 3 days/week, for 60 minutes. The control group (CG) followed routine clinical orientations. The main outcomes were cardiorespiratory fitness, muscle strength, lung function, quality of life, asthma control, and functional tests after 3 months of the intervention.

RESULTS

Fifty-three patients (IG = 25 and CG = 28) with a mean age of 11.5 ± 2.6 years were included. No significant differences were found between groups regarding lung function, asthma control, quality of life, and functional tests. Ventilatory equivalent for oxygen consumption at ventilatory threshold (P = .025; ηp2  = 0.083), peak oxygen consumption (P = .008; ηp2  = 0.116) and test duration (P = .014; ηp2  = 0.1) presented greater improvements in the IG. In addition, improvements were observed in leg press (P < .001; ηp2  = 0.36), hamstring curl (P = .001; ηp2  = 0.217), high row (P = .003; ηp2  = .167), low row (P = .009; ηp2  = 0.128) and quadriceps leg extension (P = .015; ηp2  = 0.108) in the IG.

CONCLUSION

Combined exercise training (resistance and aerobic) improved cardiorespiratory fitness and muscle strength in children and adolescents with controlled asthma and exercise symptoms.

Patients with asthma have reduced functional capacity and sedentary behavior

OBJECTIVE

The modified shuttle test is a field test that avoids the ceiling effect, and there are no reports of a multidimensional assessment concerning physical activity in asthmatic patients. Thus, the aim was to evaluate functional capacity by MST, additionally to perform a multidimensional assessment as physical activity in daily life, muscle strength, and cytokine levels in children and adolescents with asthma, and to correlate these variables.

METHOD

This cross-sectional study included volunteers aged between 6 and 18 years who were divided into two groups: asthma group (n=43) that received regular treatment and control group (n=24). Functional capacity was evaluated by distance walked during the MST; physical activity in daily life was evaluated using an accelerometer by the number of steps. Quadriceps femoris strength was evaluated by load cell.

RESULTS

Distance walked was lower for the asthma group (790m [222m]) when compared with the control group (950m [240m]; p=0.007); however, the number of steps was similar between the two groups (asthma group: 7743 [3075]; control group: 7181 [3040]; p=0.41), and both groups were classified as sedentary behavior. There was no difference in muscle strength. Tumor necrosis factor-α differed, but interleukin levels were similar between groups. Quadriceps strength was correlated to distance walked (r=0.62; p<0.001) and tumor necrosis factor-α to the number of steps taken (r=-0.54, p=0.005).

CONCLUSION

Children and adolescents undergoing regular asthma treatment showed reduced functional capacity and sedentary behavior. The lower the quadriceps strength, the shorter the distance walked; the higher the tumor necrosis factor-α levels, the lower their daily physical activity levels.

PSYCHOSOCIAL CHARACTERISTICS IN CHILDREN WITH ASTHMA REGARDING PHYSICAL ACTIVITY

ABSTRACT Introduction Children who are more active enjoy sports, have confidence in their ability to engage in physical activity, feel competent and perceive fewer barriers to physical activity. Objective Psychosocially characterize the asthmatic child’s relationship with enjoyable physical activity, physical self-concept, health and perceived quality of life. Method Eighty asthmatic children (age = 11.33 ± 1.10 years, body mass index [BMI] = 20.52 ± 3.83 kg/m2) and 80 healthy children (age = 11.18 ± 1.00 years, BMI = 20.81 ± 4.24 kg/m2) participated in the study. The Physical Activity Enjoyment Scale (PACES), Physical Activity Questionnaire for Children (PAQ-C), the Physical Self-concept Questionnaire (CAF) and the Pediatric Asthma Quality of Life Questionnaire (PAQLQ) were used. Results In the PACES questionnaire, healthy children had a better level of general physical activity while in the CAF questionnaire, significant differences were found in ability, physical fitness and general self-concept, which were higher in healthy children. There is a significant correlation between the PAQ-C and ability, general physical self-concept, PACES and total PAQLQ in asthmatic children. Conclusion Asthmatic children had lower levels of physical activity, physical self-concept and enjoyment in physical activity than healthy children. Level of evidence II; Retrospective study.

Do Urban Minority Parents and Children Agree on Asthma Symptoms with Exercise, Worries, and Confidence in Disease Management?

OBJECTIVE

Providers commonly rely on parent reports of a child's asthma symptoms; however, children as young as 7 years can report on their own health. Our study compared parent and child reports of asthma symptoms with exercise, worries about developing an asthma attack, and confidence in disease management.

METHODS

We recruited children ages 7 to 10 years with asthma from 4 Bronx, NY, schools, as well as their parents. The parents and children completed interview surveys with parallel questions regarding perceived asthma symptoms, asthma-related worries, and confidence in disease management. We used McNemar tests for paired data to compare parent and child responses.

RESULTS

We analyzed data for 105 parent-child pairs. Mean child age was 8.5 years (standard deviation, 0.99); 53% were male, and 82% were Hispanic. Children were more likely than their parents to report ever having an exercise-induced asthma attack (85% vs 48%; P < .001) and that they "worry a lot" about developing an asthma attack during exercise (63% vs 45%; P = .01). Children felt more confident about using an inhaler correctly (76% of the children were "very sure" vs 60% of the parents; P = .009) and were more likely to report having an inhaler available in case of an attack (38% of the children were "very sure" vs 20% of the parents; P = .003).

CONCLUSIONS

In this school-based sample of urban children with asthma, we found disagreement between parent and child reports of symptoms with exercise, worry about developing an attack, and confidence in medication use. These findings suggest that including child reports during history taking could help providers identify children in need of enhanced asthma management.

Relationship between physical activity level and psychosocial and socioeconomic factors and issues in children and adolescents with asthma: a scoping review

BACKGROUND

Asthma is a heterogeneous chronic airway disease which may reduce capability for physical activity. In healthy peers, physical activity is influenced by psychosocial and socioeconomic factors. Knowledge about the role of these factors has not been mapped in children and adolescents with asthma.

OBJECTIVE

The main objective of this scoping review was to identify psychosocial and socioeconomic factors associated with physical activity level in children and adolescents with asthma in the literature. The specific objectives were to map the instruments used to measure these factors, report on the construction and validation of these instruments, map psychosocial and socioeconomic issues related to physical activity level reported in qualitative studies, and identify gaps in knowledge about the relationship between psychosocial and socioeconomic factors and physical activity level in children and adolescents with asthma.

INCLUSION CRITERIA TYPES OF PARTICIPANTS

Children and adolescents with asthma aged six to 18 years.

CONCEPT

Psychosocial and socioeconomic factors related to physical activity level and participation.

CONTEXT

All physical activity contexts.

TYPES OF SOURCES

Quantitative and qualitative primary studies in English, with no date limit.

SEARCH STRATEGY

The databases searched included nine major databases for health and sports science, and five databases for unpublished studies. After screening and identification of studies, the reference lists of all identified reports were searched, and forward citation searches were conducted using four databases.

EXTRACTION OF THE RESULTS

The following data were extracted: (a) relevant study characteristics and assessment of physical activity level, (b) instruments used to assess psychosocial and socioeconomic factors, (c) association between physical activity level and these factors, (d) construction and validation of instruments, and (e) psychosocial and socioeconomic issues related to physical activity participation.

PRESENTATION OF THE RESULTS

Twenty-one quantitative and 13 qualitative studies were included. In cross-sectional studies, enjoyment, physical self-concept, self-efficacy, attitudes and beliefs about physical activity and health, psychological distress, health-related quality of life, and social support were more often reported as being correlated with physical activity level. In three studies, the construct validity was assessed by factor analysis and construct reliability tests for the study population. Qualitative studies reported 10 issues related to physical activity participation, and capability and being like peers were most commonly reported. There was no direct evidence that qualitative research informed the development or adjustment of instruments in quantitative studies.

CONCLUSIONS

Seven psychosocial factors correlated with physical activity level; capability and being like peers were the most commonly reported issues. Reports of the construction and validation of instruments were sparse.

Parental Perspectives of Barriers to Physical Activity in Urban Schoolchildren With Asthma

OBJECTIVE

Physical activity (PA) levels are low in today's youth and may even be lower in those with asthma. Barriers to PA have not been well studied in inner-city minority children with asthma. We conducted a qualitative study to characterize parental perceptions of barriers to PA and ways to improve PA levels in children with asthma.

METHODS

We used the socioecologic model to inform development of our interview guide. Questions fell into 2 socioecologic model domains: interpersonal (parent, family) barriers and community (neighborhood, school) barriers. Qualitative semistructured interviews were conducted with 23 parents (21 mothers, 2 fathers) of inner-city children with asthma (aged 8-10 years) from 10 Bronx, New York, elementary schools. Sampling continued until thematic saturation was reached. Interviews were recorded, transcribed, and independently coded for common themes. Emerging themes were discussed and agreed on by investigators.

RESULTS

Three themes surrounding interpersonal barriers to PA emerged: 1) parental fear of exercise-induced asthma due to lack of child symptom awareness, 2) nonadherence and refusal to take medications, and 3) challenges with asthma management. Four themes around community barriers to PA emerged: 1) lack of trust in school management of asthma, 2) lack of school PA facilities, 3) unsafe neighborhoods, and 4) financial burden of PA.

CONCLUSIONS

A complex, multilevel set of barriers to PA exist in children with asthma. Addressing these barriers by involving stakeholders at the family, school, and community levels may improve PA levels in children with asthma.

Association of exercise-induced wheeze and other asthma symptoms with emergency department visits and hospitalizations in a large cohort of urban adolescents

OBJECTIVE

Exercise-induced wheeze (EIW) has been found to be associated with asthma-related urgent care in school-aged children. Despite asthma's high prevalence and morbidity among adolescents, this association has not been examined in adolescents. We tested the association of EIW and other asthma symptoms to asthma-related ED visits and hospitalizations in urban adolescents with probable asthma. We hypothesized that EIW would be associated with urgent care.

METHODS

In this cross-sectional study 30,467 high school students (mean age = 16.0) from 49 NYC schools completed two brief validated measures, one assessing probable asthma and the other the frequency of six asthma symptoms over the past year. Adolescents also reported if in the past year they had an asthma-related ED visit or hospitalization. Analyses presented here included students with probable asthma (n = 9149). Using logistic regression, we modeled each asthma symptom as a function of ED visits and hospitalizations adjusting for sex, age, race/ethnicity and asthma severity. Multivariable models included all symptoms to account for the potential interaction between symptoms.

RESULTS

Among adolescents with probable asthma, EIW was associated with ED visits and hospitalizations. In multivariable models wheeze without a cold, chest tightness, night wakening, but not EIW, were significantly associated with both ED visits and hospitalizations.

CONCLUSIONS

Unlike findings with younger children, EIW does not appear to be associated with ED visits and hospitalizations among urban adolescents with probable asthma. Instead, symptoms, such as chest tightness and night wakening, appear to be important at identifying adolescents at risk for asthma-related urgent care.

Exploring the Association Between Self-Reported Asthma Impact and Fitbit-Derived Sleep Quality and Physical Activity Measures in Adolescents

Background

Smart wearables such as the Fitbit wristband provide the opportunity to monitor patients more comprehensively, to track patients in a fashion that more closely follows the contours of their lives, and to derive a more complete dataset that enables precision medicine. However, the utility and efficacy of using wearable devices to monitor adolescent patients’ asthma outcomes have not been established.

Objective

The objective of this study was to explore the association between self‑reported sleep data, Fitbit sleep and physical activity data, and pediatric asthma impact (PAI).

Methods

We conducted an 8‑week pilot study with 22 adolescent asthma patients to collect: (1) weekly or biweekly patient‑reported data using the Patient-Reported Outcomes Measurement Information System (PROMIS) measures of PAI, sleep disturbance (SD), and sleep‑related impairment (SRI) and (2) real-time Fitbit (ie, Fitbit Charge HR) data on physical activity (F-AM) and sleep quality (F‑SQ). To explore the relationship among the self-reported and Fitbit measures, we computed weekly Pearson correlations among these variables of interest.

Results

We have shown that the Fitbit-derived sleep quality F-SQ measure has a moderate correlation with the PROMIS SD score (average r=−.31, P=.01) and a weak but significant correlation with the PROMIS PAI score (average r=−.18, P=.02). The Fitbit physical activity measure has a negligible correlation with PAI (average r=.04, P=.62).

Conclusions

Our findings support the potential of using wrist-worn devices to continuously monitor two important factors—physical activity and sleep—associated with patients’ asthma outcomes and to develop a personalized asthma management platform.

Factors associated with in-school physical activity among urban children with asthma

OBJECTIVE

A cross-sectional study was conducted to determine if in-school physical activity (PA) varied by age, gender, weight and asthma status, participation in physical education (PE), outdoor recess, and other in-school PA among urban schoolchildren with asthma.

METHODS

PA was measured by tri-axial accelerometers. Height and mass were measured and overweight defined as BMI ≥85th percentile. Asthma impairment and risk were assessed as per national guidelines, and asthma status variable with three categories (mild, moderate, and severe) was created. Multivariable generalized linear mixed models adjusting for clustering due to school and student were fitted to identify variables predictive of PA.

RESULTS

108 children with asthma participated. Children spent 374 minutes in school, of which 253 minutes were sedentary, 105 minutes in light PA, and 16 minutes in moderate-to-vigorous PA (MVPA). Only 3 participants reached the recommended ≥30 minutes/day of MVPA. Multivariable analysis revealed age, gender, participation in PE class, outdoor recess, and other in-school PA as independent predictors of PA. BMI and asthma status were not associated with PA.

CONCLUSIONS

Children with asthma were mostly sedentary at school. Older children and girls were particularly at risk for inactivity. PE, recess, and other in-school PA participation are modifiable factors that should be targeted in school-based interventions aimed at increasing PA in this population.

The difference in amount of physical activity performed by children with and without asthma: A systematic review and meta-analysis

OBJECTIVE

Despite the benefits of a physically active lifestyle, some studies suggest fear of exacerbations by both children and their parents limit physical activity in children with asthma. We undertook a systematic review to quantify the difference in objectively measured physical activity levels of children and adolescents with and without asthma.

DATA SOURCES

MEDLINE, PubMed and EMBASE.

STUDY SELECTION

English language observational studies of children and adolescents to the age of 18 that compared objectively measured physical activity (accelerometer or pedometer devices) between those with asthma and without asthma.

RESULTS

Overall 22,285 articles were retrieved with 12 studies being included in the review: 1 cohort, 1 case-control and 10 cross-sectional. A meta-analysis of accelerometry data from the single cohort study and 8 cross-sectional studies produced an overall mean difference of 0.01 (95% CI: -0.09-0.11) activity counts per minute in children and adolescents without asthma compared to those with asthma.

CONCLUSION

We did not find any evidence that children and adolescents with and without asthma engaged in different amounts of physical activity when measured objectively by accelerometers. Children and adolescents with asthma may not require differentially targeted policies to encourage more physical activity, however further longitudinal studies are needed.

Inspiratory muscle function in asthmatic and healthy subjects: influence of age, nutrition and physical activity

OBJECTIVE

To compare inspiratory muscle function (strength and endurance) between asthmatics and healthy controls, and the influence of age, nutritional status and physical activity on them.

METHODS

This is a cross-sectional study. Asthmatic and healthy subjects, aged 6 to 18 years old, recruited from two public schools in Southern Brazil were included in the study. Asthmatic subjects were selected using the criteria presented by the International Study on Asthma and Allergies in Children and control subjects based on the absence of respiratory symptoms. Anthropometric data was measured, body mass index calculated and subjects classified as normal weight, overweight or obese. Physical activity levels, maximum inspiratory pressure (MIP) and inspiratory muscle endurance (IME) were also evaluated.

RESULTS

A total of 314 participants were included, separated into control group (181) and asthmatics (133), with a total mean age of 11 years. When both groups were compared, there were no significant differences in both MIP and IME. However, when groups were analyzed subdivided in children and adolescents, IME was significantly reduced (p = 0.003) in asthmatic adolescents. Indeed, when groups were also stratified considering the nutritional status, IME showed a reduction in asthmatic adolescents with overweight (p = 0.042) and obesity (p = 0.041) when compared to healthy controls. No effects of physical activity levels between groups were found.

CONCLUSIONS

Results demonstrate a reduction in the IME in asthmatic adolescents with overweight and obesity, indicating an association between asthma, nutritional status and respiratory muscle function.

Effect of a physical activity program on sport enjoyment, physical activity participation, physical self-concept and quality of life in children with asthma

Abstract This study aims to analyse the effects of indoor physical training program on the enjoyment and the willingness to participate in sports activities, physical self-concept and the quality of life in children with asthma. Participants were randomized in an experimental group (EG) (n=58, age=11.55±1.01 years old) and, a control group (CG) (n = 47, age=11.51±1.42 years old). An indoor training program was executed for 12-week, with each week containing three sessions of 60 minutes. Enjoyment in physical activity questionnaire, participation in physical activities, physical self-concept questionnaire, 6 minute walking test, and paediatric asthma quality of life questionnaire were employed. After the intervention, EG showed a significant reduction in the body mass index as well as a significant improvement in physical fitness test and the score obtained in questionnaires compared to the CG. A12-week indoor training program targeted towards asthmatic children improved the sport enjoyment, physical activity participation, physical self-concept, and quality of life.

Relationships among obesity, physical activity and sedentary behavior in young adolescents with and without lifetime asthma

OBJECTIVE

To examine the inter-relationships among body mass index (BMI), physical activity, sedentary behavior and gender in urban, low-income, primarily African American young adolescents with or without lifetime asthma.

METHODS

Data were collected in 2002-2004 from 626 12-year old adolescents who were children of women who participated in the New Mother's Study in Memphis, TN (1990-1991). Adolescents with and without asthma were compared on BMI, physical activity and sedentary behavior. Multiple linear regression models were used to examine the association of asthma, gender and BMI with physical activity and sedentary behavior.

RESULTS

Complete data were available for 545 adolescents. Eleven percent of adolescents had lifetime asthma. Asthma and gender were associated with high-intensity physical activity (p < 0.001). Adolescents with asthma participated in less physical activity and girls participated less than boys. Gender was associated with sedentary behavior (p < 0.001): boys used personal computer (pc)/video after school more than girls. Girls with asthma had a higher BMI than girls without asthma (p = 0.027). Boys with asthma were less physically active than boys without asthma (p < 0.05).

CONCLUSIONS

Adolescents with asthma are less physically active than those without asthma and girls are less active than boys. Clinicians who provide care for adolescents with asthma are encouraged to assess physical activity/sedentary behavior and provide guidance that promotes active lifestyles. A longitudinal study is needed to shed light on the unique contribution of asthma separated from the effects of overweight/obesity on physical activity and sedentary behaviors.

Effects of a pulmonary rehabilitation program on physical capacity, peripheral muscle function and inflammatory markers in asthmatic children and adolescents: study protocol for a randomized controlled trial

Background

Individuals with chronic lung disease are more susceptible to present reduction in exercise tolerance and muscles strength not only due to pulmonary limitations but also due systemic repercussions of the pulmonary disease.

The aim of this study is to assess the physical capacity, peripheral muscle function, physical activity in daily life, and the inflammatory markers in children and adolescents with asthma after pulmonary rehabilitation program.

Method

This is a study protocol of randomized controlled trial in asthmatic patients between 6 to 18 years old. The assessments will be conducted in three different days and will be performed at the beginning and at the end of the protocol. First visit: quality of life questionnaire, asthma control questionnaire, pre- and post-bronchodilator spirometry (400 μcg salbutamol), inflammatory assessment (blood collection), and cardiopulmonary exercise test on a cycle ergometer to determine aerobic capacity. Second visit: assessment of strength and endurance of the quadriceps femoris and biceps brachii muscles with concomitant electromyography to assess peripheral muscle strength. Third visit: incremental shuttle walk test (ISWT) and accelerometer to evaluate functional capacity and physical activity in daily life during 7 days. Then, the volunteers will be randomized to receive pulmonary rehabilitation program (intervention group) or chest physiotherapy + stretching exercises (control group). Both groups will have a supervised session, twice a week, each session will have 60 minutes duration, with minimum interval of 24 hours, for a period of 8 weeks. Intervention group: aerobic training (35 minutes) intensity between 60 to 80 % of the maximum workload of cardiopulmonary exercise testing or of ISWT; strength muscle training will be applied to the quadriceps femoris, biceps brachii and deltoid muscles (intensity: 40 to 70 % of maximal repetition, 3 x 8 repetition); finally the oral high-frequency oscillation device (Flutter®) will be used for 5 minutes. The control group: oral high-frequency oscillation device (Flutter®) for 10 minutes followed by the stretching of upper and lower limbs for 40 minutes. It is expected to observe the improvement in aerobic capacity, physical activity in daily life, muscle strength and quality of life of patients in the intervention group, and reduction in inflammatory markers.

Trial registration

Clinical Trial Number: NCT02383069. Data of registration: 03/03/2015

Gender differences in objectively assessed physical activity in asthmatic and non-asthmatic children

OBJECTIVE

To compare objectively assessed physical activity levels, between asthmatic children and non-asthmatic controls.

METHODS

From a random community sample of 794 children aged 8-9 years, in a case-control design, 104 children with ever doctor's diagnosis of asthma and 99 non-asthmatic controls were recruited and had assessment of physical activity with biaxial accelerometers for 7 days.

RESULTS

Children with active (also reporting at least one episode of wheezing in the last 12 months) and inactive (no wheezing in past 12 months) asthma appeared to have similar physical activity and sedentary activity levels compared to non-asthmatic children. However, girls with active asthma had significantly lower moderate-to-vigorous physical activity (MVPA) levels than their peers with adjusted geometric mean ratio of 0.59 (95% CI: 0.369, 0.929, P-value = 0.024). No difference in physical and sedentary activity levels was observed between asthmatic and non-asthmatic boys. The difference between genders in the comparison of MVPA levels in asthmatics and controls was statistically significant (P-value of likelihood ratio test [LRT] for effect modification by gender = 0.034).

CONCLUSIONS

Unlike boys, girls with active asthma appear to be less active than their healthy peers, and this gender difference might explain the inconsistent evidence from previous reports on physical activity levels in asthmatic children. Further studies are needed to confirm the gender interaction in the childhood asthma-physical activity relation and the implications on current guidelines for physical exercise prescriptions in asthmatic children.

Attenuated salivary cortisol response after exercise test in children with asthma

OBJECTIVE

The clinical relevance of lower basal cortisol levels in children with asthma is unclear. We compared the salivary cortisol response after a standardized exercise test in children with asthma versus the salivary cortisol response in healthy children.

METHODS

Nineteen prepubertal children with asthma and 20 prepubertal healthy children performed a standardized exercise test twice. Salivary cortisol levels were determined before exercise and immediately and 15 min after exercise. Morning salivary cortisol levels were determined from saliva collected at home.

RESULTS

Salivary cortisol levels increased in 84.2% of the healthy children compared to 35.0% in children with asthma after the 20-m shuttle-run test. Median increase in salivary cortisol levels was 200.3% [95% confidence interval (CI), 141.8-346.1] in healthy children compared to 89.8% (95% CI, 56.9-181.6) in children with asthma. The response was not related to the morning salivary cortisol level or maintenance dose of inhaled corticosteroids. The mean time to exhaustion of both shuttle-run tests was significantly shorter in children with asthma (mean difference 1.4 min; 95% CI, 0.7-2.3). None of the children had to stop because of dyspnea.

CONCLUSION

Our study demonstrates that children with asthma using a maintenance dose of inhaled corticosteroids (ICS) have an attenuated salivary cortisol response compared with healthy children.

Effects of exercise training on airway hyperreactivity in asthma: a systematic review and meta-analysis

BACKGROUND

Although physical exercise is recommended for asthmatics, evidence on the effects of exercise on clinical key factors is still missing.

OBJECTIVES

We performed a systematic review and meta-analysis to determine the effect of exercise training (EXT) on quality of life (QoL), bronchial hyperresponsiveness (BHR), exercise-induced bronchoconstriction (EIB), lung function and exercise capacity, plus the factors affecting changes in QoL and exercise capacity in asthmatics after a period of EXT.

DATA SOURCES

A computerized search was conducted in MEDLINE, EMBASE, and CINAHL (last search on 15 November 2012), without language restriction, and references of original studies and reviews were searched for further relevant studies.

STUDY SELECTION

Two independent investigators screened full-text studies with asthmatic subjects undertaking EXT (defined as training for ≥7 days, ≥2 times per week, ≥5 training sessions in total) that assessed at least one of the following outcomes: QoL, airway hyperreactivity, forced expiratory volume in one second (FEV₁), peak expiratory flow (PEF), inflammatory parameters, exercise capacity, or exercise endurance. Potentially relevant studies were excluded if only respiratory muscle training, breathing exercises or yoga was performed, if asthmatic subjects with co-morbidities were investigated, if only data of mixed patient groups without separate results for asthmatics were presented, if training regimens were not sufficiently specified, if no numerical outcome data were presented, and if new long-term medication was introduced in addition to physical training. Of 500 potentially relevant articles, 13.4 % (67 studies including 2,059 subjects) met the eligibility criteria and were included for further analyses.

STUDY APPRAISAL AND SYNTHESIS METHODS

Data extraction and risk of bias assessment was performed according to the Cochrane Handbook for Systematic Reviews of Interventions. A meta-analysis of all randomized controlled trials (RCTs) was performed to determine the effect of EXT on asthma symptoms, BHR, EIB, FEV₁, exercise capacity and exercise endurance compared with control training. In addition, relative pre/post changes were analysed in all RCTs and controlled trials. Finally, multiple linear regression models were used to identify effects of relative changes in airway hyperreactivity (BHR or EIB), lung function (FEV₁ or PEF) and training hours on QoL and exercise performance.

RESULTS

In a total of 17 studies including 599 subjects, meta-analyses showed a significant improvement in days without asthma symptoms, FEV1 and exercise capacity while BHR only tended to improve. The analysis of relative within-group changes after EXT showed, however, significant improvements in QoL (17 %), BHR (53 %), EIB (9 %), and FEV1 (3 %) compared with control conditions. Multiple linear regression models revealed that changes in airway hyperreactivity and lung function significantly contributed to the change in QoL, while mainly the changes in airway hyperreactivity contributed to the change in exercise capacity.

CONCLUSION

EXT was shown to improve asthma symptoms, QoL, exercise capacity, BHR, EIB, and FEV1 in asthmatics and improvements in BHR explained part of the improvement in QoL and exercise capacity. Thus, physical activity should be recommended as a supplementary therapy to medication. However, more well controlled studies should be performed assessing the relationship of physical activity, QoL, airway hyperreactivity, lung function and especially airway inflammation as well as medication intake.

In-school asthma management and physical activity: children's perspectives

OBJECTIVE

Regular physical activity (PA) is an important component of pediatric asthma management. No studies have examined how in-school asthma management influences PA from children's perspectives. The aim of this study was to explore children's perceptions of the impact of in-school asthma management on PA.

METHODS

Qualitative interviews with 23 inner-city minority children with asthma (aged 8-10 yrs; 12 girls, 11 boys) were conducted in 10 Bronx, New York elementary schools. Sampling continued until saturation was reached. Interviews were recorded, transcribed and independently coded for common themes.

RESULTS

Interviews produced five themes representing students' perceptions about (1) asthma symptoms during in-school PA; (2) methods to control asthma episodes during school PA; (3) methods to prevent asthma episodes during school; (4) limited accessibility of asthma medications; and (5) negative feelings about asthma and medication use. The majority of students experienced asthma symptoms while performing PA during school. Primary methods of managing asthma symptoms were sitting out during activity, drinking water, and visiting the nurse. Students lacked awareness or adherence to action plans to prevent or control asthma. Students reported limited access to medication during school and feelings of embarrassment and/or concerns of teasing when medicating in front of others.

CONCLUSIONS

Our results indicate inappropriate in-school management of asthma symptoms, poor asthma control, lack of accessible medication, and stigma around publicly using asthma medication. Thus, students often missed or were withheld from PA. Interventions to improve in-school asthma care must consider ways to address these issues.

Validity and reliability of Physical Activity Enjoyment Scale questionnaire (PACES) in children with asthma

OBJECTIVE

The aim of this study is to test the psychometric properties of the Physical Activity Enjoyment Scale (PACES) in children with asthma.

METHOD

Participants included 185 children (age = 11.38 ± 1.12 years; body mass index = 20.66 ± 4.13 kg/m(2)): 107 children with asthma and 78 healthy children. To test the enjoyment of physical activity, PACES of Motl et al. was used in its Spanish version. In addition, the Physical Activity Questionnaire for Children (PAQ-C), Paediatric Asthma Quality of Life Questionnaire (PAQLQ) and Physical Self-Concept Questionnaire (CAF) have been used.

RESULTS

The results have shown a two-factor structure corresponding to the model whose settings have been good. PACES internal consistency was very high (Cronbach's alpha = 0.906). The PACES test-retest reliability indicates a good temporal concordance (Spearman rho = 0.868, p < 0.001). This presents an adequate concurrent validity with the total PAQLQ, the PAQ-C as well as with ability, fitness, attractiveness, strength and general physical self-concept.

CONCLUSIONS

The findings confirm that PACES is a valid and reliable measure of physical activity enjoyment in children with asthma.

An examination of comorbid asthma and obesity: assessing differences in physical activity, sleep duration, health-related quality of life and parental distress

OBJECTIVE

Compare youth with comorbid asthma and obesity to youth with obesity only to determine if differences exist in body mass index, dietary intake, levels of physical activity, sleep duration and health-related quality of life. Levels of parent distress were also compared.

METHODS

Participants included 248 children (n = 175 in Obesity group; n = 73 in Asthma + Obesity group) with a BMI ≥ 85th percentile for age and gender, and their participating parent(s) or legal guardian(s). Measures of child height and weight were obtained by study personnel and Z-scores for child body mass index were calculated using age- and gender-specific norms. Child physical activity and sleep duration were measured via accelerometers. Dietary intake, health-related quality of life and parent distress were assessed via self-report.

RESULTS

The Asthma + Obesity group evidenced significantly higher body mass index scores, and had lower sleep duration. There was a non-statistically significant trend for lower levels of physical activity among children in the Asthma + Obesity group. Dietary intake, health-related quality of life and parent distress did not differ between groups.

CONCLUSIONS

Youth with comorbid asthma and obesity are at increased risk for negative health and psychosocial difficulties compared to youth who are overweight or obese only. Professionals providing treatment for youth with asthma are encouraged to assess the implications of weight status on health behaviors and family psychosocial adjustment.

Children and adolescents with mild intermittent or mild persistent asthma: aerobic capacity between attacks

OBJECTIVE

To assess children and adolescents diagnosed with mild intermittent or mild persistent asthma, in terms of their aerobic capacity between attacks.

METHODS

We included 33 children and adolescents recently diagnosed with asthma (mild intermittent or mild persistent) and 36 healthy children and adolescents. Those with asthma were evaluated between attacks. All participants underwent clinical evaluation; assessment of baseline physical activity level; pre- and post-bronchodilator spirometry; and a maximal exercise test, including determination of maximal voluntary ventilation, maximal oxygen uptake, respiratory quotient, maximal minute ventilation, ventilatory equivalent, ventilatory reserve, maximal HR, SpO2, and serum lactate.

RESULTS

No significant differences were found among the groups (intermittent asthma, persistent asthma, and control) regarding anthropometric or spirometric variables. There were no significant differences among the groups regarding the variables studied during the maximal exercise test.

CONCLUSIONS

A diagnosis of mild intermittent/persistent asthma has no effect on the aerobic capacity of children and adolescents between asthma attacks.

Exercise training in children with asthma: a systematic review

Exercise can provoke asthma symptoms, such as dyspnoea, in children with asthma. Exercise-induced bronchoconstriction (EIB) is prevalent in 40-90% of children with asthma. Conversely, exercise can improve physical fitness. The purpose of this paper is to provide a systematic review of the literature regarding the effects of exercise training in children with asthma, particularly in relation to: EIB, asthma control, pulmonary function, cardiorespiratory parameters and parameters of underlying pathophysiology. A systematic search in several databases was performed. Controlled trials that undertook a physical training programme in children with asthma (aged 6-18 years) were selected. Twenty-nine studies were included. Training had positive effects on several cardiorespiratory fitness parameters. A few studies demonstrated that training could improve EIB, especially in cases where there was sufficient room for improvement. Peak expiratory flow was the only lung function parameter that could be improved substantially by training. The effects of training on asthma control, airway inflammation and bronchial hyper-responsiveness were barely studied. Owing to the overall beneficial effects of training and the lack of negative effects, it can be concluded that physical exercise is safe and can be recommended in children with asthma. A training programme should have a minimum duration of 3 months, with at least two 60 min training sessions per week, and a training intensity set at the (personalised) ventilatory threshold. Further research is recommended regarding the effects of exercise on underlying pathophysiological mechanisms and asthma control in children with asthma.

Attitudes of asthmatic and nonasthmatic children to physical exercise

PURPOSE

The aim of this study was to examine the physical activity of children with and without asthma in Greece, the factors affecting their intention to exercise, and the influence of gender.

METHOD

The study involved 50 children with asthma and 50 children without asthma, aged 9-14-years old. We used the leisure time exercise questionnaire to assess the frequency and intensity of exercise. The planned behavior scale examined seven factors affecting physical activity: attitude, intention, self-identity, attitude strength, social role model, information, and knowledge.

RESULTS

Asthmatic children did not differ significantly in mild, moderate, and overall level of physical activity from children without asthma but they participated less in intense and systematic exercise. The two asthmatic groups did not differ in any of the planned behavior factors. Significant differences between genders occurred with respect to self-identity and social role model. Boys appeared to exercise more regularly and intensely compared to girls.

CONCLUSION

Asthmatic children did not systematically participate in physical activity, preferring mostly mild and moderate intensity activities. Children with and without asthma had comparable positive attitudes and intentions toward exercise.

Predicted aerobic capacity of asthmatic children: a research study from clinical origin

Objective. To compare longitudinally PAC of asthmatic children against that of healthy controls during ten months. Methods. Twenty-eight asthmatic children aged 7-15 years and 27 matched controls each performed six submaximal exercise tests on treadmill, which included a test of EIA (exercise-induced asthma). Predicted aerobic capacity (mLO(2)/min/kg) was calculated. Spirometry and development were measured. Physical activity, medication, and "ever asthma/current asthma" were reported by questionnaire. Results. Predicted aerobic capacity of asthmatics was lower than that of controls (P = 0.0015) across observation times and for both groups an important increase in predicted aerobic capacity according to time was observed (P < 0.001). FEV(1) of the asthmatic children was within normal range. The majority (86%) of the asthmatics reported pulmonary symptoms to accompany their physical activity. Physical activity (hours per week) showed important effects for the variation in predicted aerobic capacity at baseline (F = 2.28, P = 0.061) and at the T4 observation (F = 3.03, P = 0.027) and the analyses showed important asthma/control group effects at baseline, month four, and month ten. Physical activity of the asthmatics correlated positively with predicted aerobic capacity. Conclusion. The asthmatic children had consistently low PAC when observed across time. Physical activity was positively associated with PAC in the asthmatics.

Association between asthma and physical activity in Korean adolescents: the 3rd Korea Youth Risk Behavior Web-based Survey (KYRBWS-III)

BACKGROUND

Asthma is the leading chronic illness among children and adolescents in several nations. This study investigated the association between asthma and physical activity (PA).

METHODS

The findings in this study are based on the data obtained from the 2007 3rd Korea Youth Risk Behavior Web-Based Survey (KYRBWS-III), a cross-sectional survey of health-risk behaviours among a representative sample of Korean middle- and high-school students aged 13-18 years. This survey is conducted annually by the Korea Centers for Disease Control and Prevention. The 72 943 study subjects were selected using the complex sampling design of the survey. The association between asthma and PA was assessed by conducting multiple logistic regression analyses of the data by using the statistical software SPSS 17.0 Complex Sample.

RESULTS

Compared with the adolescents without current asthma, significantly fewer adolescents with current asthma had a sedentary time of 3 h or less per day (odds ratio, 0.86; 95% confidence interval, 0.75-0.97). Sedentary time was defined as time spent watching television, surfing the Internet, or playing computer games and excluded the time spent doing homework or study during leisure time. The analysis was adjusted for age, gender, family affluence level (FAL), obesity, allergic rhinitis, atopy and smoking. With regard to participation in adequate vigorous or moderate PA, strengthening exercise or physical education class, no significant differences were found between the adolescent students with current asthma and those without current asthma. In addition, it was found that all PA had no significant differences in their effects on asthma severity (medication, inability to work and absence from school).

CONCLUSION

Our results show that the amount of sedentary time influenced asthma prevalence; however, PA did not influence asthma prevalence in Korean adolescents.

Lifestyle and the Respiratory Health of Children

This article offers a review of the potential influences of personal lifestyle on respiratory health in children, looking at both healthy individuals and those with respiratory disorders. As with many aspects of health, regular physical activity, an appropriate diet, and avoidance of obesity and cigarette smoke all contribute to optimal development of the healthy child. An active lifestyle is associated with greater static and dynamic lung volumes, greater efficiency of the ventilatory process, and an optimization of breathing patterns. The risk of upper respiratory infections is also reduced in those maintaining a moderate level of physical activity. Maternal smoking during pregnancy, as well as active and passive smoking, all have an adverse influence on lung function in the child, the largest effects being on dynamic lung volumes. The risk of developing asthma seems reduced in children who maintain a normal body mass and are physically active. A program of graded physical activity is of therapeutic value in a number of established respiratory conditions, including asthma, cystic fibrosis, and ventilatory impairment from neuromuscular disorders. Exercise carries a slight risk of fatalities from asthma and anaphylactic reactions. In designing an optimal physical activity program, it is also important to guard against the hazards of deep oronasal breathing, including the precipitation of bronchospasm by the inhalation of cold, dry air and pollens; an increased exposure to atmospheric pollutants (reducing and oxidant smog, fine and ultra-fine particulates, and carbon monoxide); and possible long-term dangers from chlorine derivatives in the atmosphere of indoor swimming pools.

A survey of physical education programs and policies in Texas schools

To better understand key physical education program factors and policies that may affect Texas students' physical fitness, a 39-question survey, administered as part of the Texas Youth Fitness Study (TYFS), was sent to 5651 Texas schools via e-mail. The survey consisted of five sections: (a) demographics, (b) physical education/recess frequency and duration, (c) resources/environment, (d) school physical education polices, and (e) experience/perception of fitness testing. A total of 2576 responses were received, of which 1505 responses (elementary = 58.1%, middle school = 21.2%, high school = 19.4%, and "mixed" school = 1.3%) were used for the report. Most of the findings are consistent with those reported in recent national studies. In addition, there were four distinct aspects: (a) broad support among teachers for the Senate Bill 530 mandate, (b) strong evidence of adherence to the mandated testing protocols, (c) teachers' negative experiences related to the testing, and (d) lack of recess in some Texas elementary schools. The survey provided rich updated information on physical education programs and policies in Texas schools.

Adherence to National Asthma Education and Prevention Program's "How Asthma-Friendly Is Your School?" recommendations

School health policies and programs provide the framework for a safe and supportive environment for students with asthma. School Health Policies and Programs Study 2006 data were examined to assess whether schools nationwide have policies and programs consistent with the "How Asthma-Friendly Is Your School?" checklist from the National Asthma Education and Prevention Program. Adherence to some of the recommendations on the checklist was high. For example, 80% or more of schools allowed students to carry and self-administer asthma medications, and obtained and kept asthma action plans. For other recommendations, however, far fewer schools had the recommended polices or programs; most notably, less than one third of schools had a full-time Registered Nurse. Improvements in many school policies and programs are needed so that students have a safe and supportive school environment to help them control their asthma while away from home.

Perception of body weight status: a case control study of obese and lean children and adolescents and their parents

BACKGROUND

The objective of this study was to investigate differences in weight perception and self-concept of obese and lean children, and to examine parents' awareness of overweight in themselves and their children. A total of 59 obese patients aged 7-17 years and 49 of their parents from a pediatric obesity out-patient clinic participated and were compared with 96 normal-weight patients and 81 of their parents from a pediatric pulmonary disease out-patient clinic.

METHODS

Children's and parents' self-perception of weight, desire for weight change and weight concerns, children's belief that their desired weight can be achieved, and parents' perception of their child's weight status were assessed using single questionnaire items. Children's self-concept was measured by the Self-Perception Profile for Children. In addition, children drew pictures about themselves and their favorite activity.

RESULTS

Obese patients wished to change their weight more frequently (p < 0.001) and had more weight concerns (p < 0.001). Their self-concept was significantly more negative. Physical activities were more common in their drawings than in those of normal-weight peers. Parents of obese children were more frequently overweight or obese themselves (p < 0.001). 35 of them and 73 parents of normal-weight children perceived their own weight realistically. Of the parents with overweight or obese children, 69.4% perceived their own child as overweight and 28.6% as very overweight, whereas 83% of them were obese.

CONCLUSION

Children and adolescents as well as their parents recognize overweight as a health problem. In the majority, weight perception matches real body weight. Most parents at least recognize overweight in their children.

Encouraging physical activity in pediatric asthma: a case-control study of the wonders of walking (WOW) program

OBJECTIVES

The complex overlap between asthma and obesity may be explained in part by activity avoidance in asthma. We compared responses to a walking intervention between matched groups of children with and without asthma. We expected youth with asthma to have lower baseline and post-intervention activity levels. Psychosocial, demographic, and physiologic correlates of activity were also examined.

DESIGN/PARTICIPANTS

We compared baseline and post-intervention activity levels among 59 children aged 10-16 with well-controlled asthma and 59 healthy matched controls. Participants completed spirometry, physical examination, anthropometric measurement, and psychosocial questionnaires. INTERVENTION/OUTCOME MEASURE: Participants wore blinded calibrated pedometers for a baseline typical activity week, returning to complete the Wonders of Walking (WOW) intervention, followed by a week of post-intervention pedometer monitoring.

RESULTS

Contrary to expectation, no differences between cases (median steps = 6,348/day) and controls (median steps = 6,825/day) in baseline activity were found. Response to the WOW intervention was comparable, with both groups demonstrating an increase of approximately 1,485 steps per day (equivalent to more than 5 additional miles walked during the post-intervention week). Health beliefs did not correlate to activity at baseline or intervention response. No significant associations between activity and asthma control, FEV1, or duration of diagnosis were found. Intervention response was comparable across racial/ethnic groups, children versus adolescents, and between normal weight and overweight youth.

CONCLUSIONS

Contrary to expectation, we found similar rates of objectively measured physical activity among youth with well-controlled asthma and controls. Importantly, we documented statistically significant increases in physical activity across both groups following a brief, pedometer-based intervention. The intervention was successful even among typically sedentary groups, and represents an effective, safe, and inexpensive walking program.

Travel patterns to school among children with asthma

BACKGROUND

Active commuting to school provides regular exercise, which can improve asthma symptoms. Little is known about how children with asthma travel to school.

OBJECTIVE

To identify travel patterns and parental perceptions surrounding mode of travel to school among children with asthma.

METHODS

Cross-sectional study of 176 children with asthma aged 5 to 15 years. Parents completed questionnaires assessing mode of travel to school, physical activity, asthma control, physician counseling, and factors influencing parental decisions. Data analysis included descriptive and bivariate statistics.

RESULTS

Few (16%) children with asthma actively commute to school. Active travelers lived closer to school, and "distance" was the most frequently reported factor influencing a parent's decision regarding travel mode to school. Parents reported few concerns about pollution and little physician counseling on active travel.

CONCLUSION

Few children with asthma actively travel to school. Asthma-specific concerns do not appear to guide parental decisions on travel mode to school.

Effect of Acu-TENS on post-exercise expiratory lung volume in subjects with asthma-A randomized controlled trial

This study examined the effect of transcutaneous electrical nerve stimulation applied over acupoints (Acu-TENS) on forced expiratory volume, in patients with asthma, after exercise. Thirty subjects were randomly assigned to three groups. Group 1 received Acu-TENS over acupuncture points Lieque and Dingchuan for 45 min prior to a symptom-limited treadmill exercise test. Group 2 had Acu-TENS similarly applied prior to and throughout the exercise test. Group 3 mimicked Group 1 but without any electrical output from the device. Forced expiratory volume in one second (FEV(1)) and forced vital capacity (FVC) were recorded before, immediately after and at 20-min intervals post-exercise for 1h. Immediately after exercise, FEV(1) and FVC rose in Group 2 (p=0.015), but decreased in Group 1 and more so in Group 3. The differences became even more marked at 20, 40 and 60 min. Adjunctive Acu-TENS therapy appears to reduce decline of FEV(1) following exercise training in patients with asthma.

Socioeconomic factors and asthma control in children

OBJECTIVES

The objective of this study was to evaluate the association between socioeconomic factors and asthma control in children, as defined by the Canadian Pediatric Asthma Consensus Guidelines.

PATIENTS AND METHODS

Cross-sectional data from a completed study of 879 asthmatic children between the ages of 1 and 18 residing in the Greater Toronto Area were used. The database included data on demographics, health status, asthma control, and health-related quality of life. Stepwise forward modeling multiple regression was used to investigate the impact of socioeconomic status on asthma control, based on six control parameters from the 2003 Canadian Pediatric Asthma Consensus Guidelines.

RESULTS

Only 11% of patients met the requirements for acceptable control, while 20% had intermediate control, and 69% had unacceptable asthma control. Children from families in lower income adequacy levels had poorer control.

CONCLUSIONS

Disparities in asthma control between children from families of different socio-economic strata persist, even with adjustment for utilization of primary care services and use of controller medications.

Exploring and explaining low participation in physical activity among children and young people with asthma: a review

Background

Asthma is the most common chronic illness among children and accounts for 1 in 5 of all child GP consultations. This paper reviews and discusses recent literature outlining the growing problem of physical inactivity among young people with asthma and explores the psychosocial dimensions that may explain inactivity levels and potentially relevant interventions and strategies, and the principles that should underpin them.

Methods

A narrative review based on an extensive and documented search of search of CinAHL, Embase, Medline, PsycINFO and the Cochrane Library.

Results & Discussion

Children and young people with asthma are generally less active than their non-asthmatic peers. Reduced participation may be influenced by organisational policies, family illness beliefs and behaviours, health care advice, and inaccurate symptom perception and attribution. Schools can be reluctant to encourage children to take part in physical education or normal play activity due to misunderstanding and a lack of clear corporate guidance. Families may accept a child's low level of activity if it is perceived that breathlessness or the need to take extra inhalers is harmful. Many young people themselves appear to accept sub-optimal control of symptoms and frequently misinterpret healthy shortness of breath on exercising with the symptoms of an impending asthma attack.

Conclusion

A multi-faceted approach is needed to translate the rhetoric of increasing activity levels in young people to the reality of improved fitness. Physical activity leading to improved fitness should become part of a goal orientated management strategy by schools, families, health care professionals and individuals. Exercise induced asthma should be regarded as a marker of poor control and a need to increase fitness rather as an excuse for inactivity. Individuals' perceptual accuracy deserves further research attention.

Relationship between asthma, overweight, and physical activity among U.S. high school students

Asthma is a leading chronic illness among children and adolescents in the United States. This study examined the relationship between asthma and both overweight and physical activity levels. Results are based on data from the Centers for Disease Control and Prevention's 2003 national Youth Risk Behavior Survey, a cross-sectional survey of health risk behaviors among a representative sample of high school students in the United States. The overall survey response rate was 67% and the results are based on weighted data. SUDAAN was used for all data analysis (prevalence estimates and logistic regression) because it accounts for the complex sampling design of the survey. Significantly more students with current asthma than without were overweight (odds ratio [OR] = 1.4; 95% confidence interval [CI] = 1.1, 1.6) and described themselves as overweight (OR = 1.2; 95% CI = 1.0, 1.4). Significantly more students with current asthma than without used a computer for non-schoolwork 3 or more hours/day (OR = 1.3; 95% CI = 1.1, 1.5). No significant differences were found for participation in sufficient vigorous or moderate physical activity or strengthening exercises among students with and without current asthma. Unlike some other risk factors for developing or exacerbating asthma, overweight and physical activity are generally modifiable. School and community policies and programs can play an important role in asthma management, including promoting the maintenance of an appropriate weight and encouraging continued physical activity.

Cardiopulmonary exercise testing in children and adolescents with asthma who report symptoms of exercise-induced bronchoconstriction

Patients with asthma often report symptoms of exercise-induced bronchoconstriction. We performed cardiopulmonary exercise testing to establish the cause of exercise limitation in patients with asthma, under treatment, who reported symptoms of exercise-induced bronchoconstriction. Ten of the 42 patients meeting criteria for inclusion in our study (24%) developed exercise-induced bronchoconstriction. Exercise limitation without exercise-induced bronchoconstriction was found in both obese and non-obese patients, suggesting that poor fitness is a problem independent of body habitus. Including cardiopulmonary exercise testing in the management of children with suspected exercise-induced bronchoconstriction would provide a better understanding of the etiology of their symptoms and facilitate more appropriate treatment.

[Physical fitness in children with asthma]

The exercise limitation in a child with asthma is the result of several factors: the lack of ventilatory reserve, muscle deconditioning, and cardiac limitation. The severity of the airway obstruction is a major determinant of physical fitness. Aerobic and anaerobic fitness are equally affected. Both types of fitness can be improved by specific training programs.