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Screen-based sedentary behavior during adolescence and pulmonary function in a birth cohort

Abstract

Background

Adolescents spend many hours in sitting activities as television viewing, video game playing and computer use. The relationship between sedentary behavior and respiratory health remains poorly elucidated. To date there have been no studies evaluating the relationship between sedentary behavior and pulmonary function in young populations. The purpose of this study is to examine the association between the trajectory of screen-based sedentary behavior from 11 to 18 years and pulmonary function at 18 years in a Brazilian birth cohort.

Methods

Data from a longitudinal prospective study conducted among the participants of the 1993 Pelotas (Brazil) Birth Cohort. Time spent on television, video games, and computers during a weekday was self-reported at ages 11, 15 and 18 years. For each age, sedentary behavior was defined as the sum of time spent on these screen-based activities. To evaluate the sedentary behavior trajectory during adolescence group-based trajectory modeling was used. Outcome variables were three pulmonary function parameters: forced expiratory volume in one second (FEV1), forced vital capacity (FVC), and peak expiratory flow (PEF), evaluated by spirometry, at 18 years expressed as z-scores. Crude and adjusted linear regressions, stratified by sex, were performed.

Results

The three-group trajectory of sedentary behavior was the best fitting model. The trajectory groups were: always high (representing 38.8% of the individuals), always moderate (54.1%), and always low (7.1%). In the adjusted analyses, boys in the always-low group for sedentary behavior had higher FVC at 18 years (β = 0.177; 95% CI:0.027;0.327; p = 0.021) than boys in the always-high group. There were no differences for other pulmonary function parameters in boys. No significant association was found for girls.

Conclusion

The trajectory of screen-based sedentary behavior throughout adolescence was not consistent associated with pulmonary function at 18 years.

Background

Sedentary behavior is commonly defined as time spent engaged in sitting or lying down that requires energy expenditure from 1.0 to 1.5 basal metabolic rates (METs) [1]. It includes activities such as television viewing and use of video games/computers [2]. Adults and adolescents spend many hours in sitting activities worldwide [3,4,5,6,7]. In a study of 66 countries with individuals aged 15 years it was observed that the overall proportion of individuals spending four or more hours per day sitting was 41.5% [4]. A population based study in the United States showed that 56% of adolescents between 12 and 15 years of age watched two or more hours of television per day [3]. A Brazilian population based study carried out in a representative sample of adolescents observed that 73.5% of the population from 12 to 17 years spent two hours or more per day on television viewing, video game playing, and computer use [5].

While physical activity is established as a protective factor for non-communicable diseases and mortality [8], several studies have shown a positive association between excessive time in sedentary behaviors and many negative health outcomes [9], including all-cause mortality [10,11,12], obesity [13], and development of non-communicable diseases [11, 14]. The negative impact of excessive sedentary behavior may be independent of the protective effect of meeting physical activity recommendations for some health outcomes [15].

Despite the rapid expansion of research on sedentary behavior and its health consequences, the relationship between sedentary behavior and respiratory health remains poorly elucidated. Most research on this subject has investigated asthma or wheezing as the primary outcome instead of measuring pulmonary function [16,17,18,19,20]. Previous studies have shown inconsistent results for the association between time spent on screen-based activities and asthma or asthma symptoms. While some cross-sectional studies with children and adolescents showed positive associations between time spent on sedentary behavior and asthma symptoms [16,17,18,19,20,21,22,23] or asthma [18, 24,25,26], other studies did not find significant cross-sectional associations [20, 27]. Vogelberg et al. [17] analyzed the longitudinal association between television viewing and computer use with development of wheezing in adolescents and did not find a significant association after stratifying the analysis for smoking status. On the other hand, Sherriff et al. [19] found an association between duration of television viewing in early childhood and developing asthma by age 11. Individuals with asthma do not necessarily have reduced pulmonary function in the absence of an asthma crisis [28].

To date there have been no studies evaluating the relationship between sedentary behavior and pulmonary function in young populations. However, pulmonary function is an important health outcome; a reduced pulmonary function is associated with increased risk of respiratory disorders, all-cause, cancer, respiratory, and cardiovascular mortality [29,30,31]. Also, individuals with reduced pulmonary function during childhood may have increased mortality risk in adulthood [32].

Therefore, the aim of this study was to examine the association between the trajectory of screen-based sedentary behavior from ages 11 to 18 years and pulmonary function at 18 years in a birth cohort from Brazil.

Methods

The current study was carried out with participants from the 1993 Pelotas Birth Cohort. All hospital-born children in the calendar year of 1993 whose families were living in the urban area of Pelotas, a city located in the Southern of Brazil, were eligible to participate in the 1993 Pelotas Birth Cohort Study. Of the 5265 live births occurring in Pelotas in 1993, 5249 mothers (99.7%) agreed to participate and were interviewed in the hospital soon after delivery. Trained interviewers conducted the interviews on sociodemographic, behavioral, and health factors. Subsamples were visited at ages of one, three and six months and one and four years. In 2004, 2008, and 2011 when the participants had reached the mean ages of 11, 15, and 18 years, respectively, all cohort members were sought for follow-up visits. The adolescents were interviewed for behavioral and health factors and received an anthropometric evaluation at each follow-up visit. Pulmonary function tests were performed with spirometry at the 2008 and 2011 visits. All visits of the 1993 Pelotas Birth Cohort Study were approved by the Ethics Committee of the Medical School of the Federal University of Pelotas. Participants signed a written informed consent at each visit. If participants were younger than 18 years of age, a parent or guardian signed the consent form. Further details on the study design and methods have been previously described [33, 34].

Pulmonary function

A standardized spirometry protocol conducted by a trained technician and under the supervision of an expert researcher was performed when the participants were 15 and 18 years old. The subjects were seated with their backs straight and wore a nose-clip during the tests. A battery-operated portable spirometer (Easy-One; NDD Medical Technologies, Chelmsford MA, USA and Zurich, Switzerland) was used. At least three acceptable spirometry trials were collected for each subject and the best trial was analyzed. Subjects who had undergone abdominal, eye, or thoracic surgery or had any hospital admissions in the previous three months or those with heart disease were excluded from spirometry. In addition, those who were undergoing tuberculosis treatment or who were pregnant or thought to be pregnant were also excluded. Based on these criteria, 64 and 144 adolescents were not eligible for spirometry at the 2008 and 2011 follow-up visits. In addition, 280 participants either refused spirometry testing or were lost to follow-up in 2008, while 53 participants refused spirometry testing or were lost to follow-up at the 2011 visit. The criteria of the American Thoracic Society (ATS) and European Respiratory Society (ERS) were used in order to ensure standardized high quality spirometry data [35]. Approximately 90% of the procedures for both follow-up visits reached acceptability and reproducibility standards.

Pulmonary function was assessed through FEV1 (forced expiratory volume in one second), FVC (forced vital capacity), and PEF (peak expiratory flow). These three pulmonary function parameters measured by spirometry at 18 years of age were the study outcomes. In the literature spirometric prediction equations have been described for different populations [36, 37]. However, these equations were not suitable for our sample. Because of this, the values of FEV1, FVC, and PEF were expressed as z-scores, which were generated from the standardized residuals of the study sample at 18 years of age, taking into account sex, skin color, and height at 18 years of age.

Sedentary behavior

During the 2004, 2008, and 2011 visits, when the participants were on average 11, 15, and 18 years old, sedentary behavior was self-reported with questionnaires on the weekday frequency of television viewing, video game playing and computer use. For each screen behavior an initial question was asked regarding participation. If the answer was affirmative, a second question was asked about the time spent in each behavior on a usual weekday. For each age, sedentary behavior was calculated as the sum in hours of time spent on television viewing, video game playing and computer use. The adolescents for whom the sum was more than 12 h were excluded from the analysis in order to avoid over-reporting due to use of more than one kind of screen simultaneously. A total of 298 adolescents were excluded from the analysis based on a sum of sedentary behavior greater than 12 h in at least one follow-up visit.

To evaluate the sedentary behavior trajectory during adolescence a group-based trajectory modeling was used. This method consists of a specialized form of finite mixture modeling used to identify groups of individuals following similar progressions of a behavior or outcome over age or time [38, 39]. The three follow-up visits (at 11, 15, and 18 years of age) were used to estimate group-based trajectories. Adolescents with missing information on sedentary behavior at one or more visit were excluded. The trajectories model were estimated through Stata procedure “traj” with zero-inflated Poisson distribution [40]. The choice of the number and shape of trajectories included in the analyses was based on the best fit of the model (the maximum Bayesian information criteria, BIC, and the Akaike information criterion, AIC).

Additional analysis was performed with the cumulative sedentary behavior during adolescence. To evaluate the cumulative sedentary behavior as a outcome, a continuous variable was created through the sum of hours spent on screen-based sedentary behavior at 11, 15, and 18 years of age, and then this value was divided by three. The results of this analysis are presented in the Additional file 1.

Statistical analysis

All statistical procedures were conducted using Stata 12.0 (StataCorp. 2011. Stata Statistical Software: Release 12. College Station, TX: StataCorp LP). A Chi-squared test was used to compare the sample of this study with the original birth cohort population. Crude and adjusted linear regression analyses were performed to assess the association between sedentary behavior trajectory from 11 to 18 years and pulmonary function at 18 years. Multivariate models were adjusted for skin color (self-reported) as marker of ethnicity, family income at birth, maternal schooling at birth, birth weight, smoking during pregnancy, mother’s height at birth, equivalent pulmonary function parameter at 15 years (z-score), body mass index (BMI) at 11 and 15 years, Tanner stage at 15 years [41], height at 18 years, leisure-time physical activity at 11 and 15 years, wheezing in the previous year at 18 years, and corticoid steroid use in the previous 3 months at 18 years. All analyses were stratified by sex.

Results

The follow-up rates for the 1993 Pelotas Birth Cohort at ages 11, 15, and 18 years were 87.5%, 85.7%, and 81.3% respectively. A final sample of 3382 participants from the 1993 Pelotas Birth Cohort with complete data on sedentary behavior at ages 11, 15 and 18 years and pulmonary function at 18 years of age, were included in the current study. These individuals did not differ from the original cohort in terms of key variables (Table 1). In the multivariate analyses 2632 participants with complete information for all covariates were included. The covariates with larger number of missing information were Tanner stage at 15 years for male subjects (n = 195) and corticoids use in the previous 3 months at 18 years for female subjects (n = 114). Table 2 presents the description of sedentary behavior trajectory categories and pulmonary function parameters for the analytic sample.

Table 1 Characteristics of the original cohort and the sample with complete data of sedentary behavior and pulmonary function
Table 2 Description of sedentary behavior trajectory and pulmonary function parameters at 15 and 18 years by sex

To identify trajectories for screen-based sedentary behavior, analyses were conducted specifying three-, four- and five-group models. Inspection of the adjusted model quality parameters revealed that the three-group model had the best fit. Fig. 1 shows the three-group trajectories for sedentary behavior. Group 1 (“always high”, n = 1379), with 38.85% of the sample, had mean hours per weekday of sedentary behavior at 11, 15 and 18 years of age of 5.51 (±0.07 SD), 6.88 (±0.07), and 6.38 (±0.07). Group 2 (“always moderate”, n = 1920), with 54.08% of the sample, had mean hours per weekday of sedentary behavior at 11, 15 and 18 years of 3.33 (±0.05), 3.64 (±0.05), and 3.46 (±0.05). Group 3 (“always low”, n = 251), with 7.07% of the sample, had mean of hours per weekday of sedentary behavior at 11, 15 and 18 years of age of 1.37 (±0.08), 1.27 (±0.07), and 1.16 (±0.07).

Fig. 1
figure 1

Screen-based sedentary behavior trajectories from 11 to 18 years of age

Table 3 shows crude and adjusted analyses for the trajectory of sedentary behavior with pulmonary function parameters. In the crude analyses, boys in the always-low group for sedentary behavior had lower FEV1 (β = −0.233; 95% CI:-0.457;-0.008) and PEF (β = −0.366; 95% CI:-0.588;-0.144) at 18 years compared to boys in the always-high group. Boys in the always-moderate group for sedentary behavior had lower PEF at 18 years of age (β = −0.180; 95% CI:-0.293;-0.068) compared to always-high boys in crude analyses. However, these associations did not remain significant after adjustment for potential confounders. On the other hand, boys in the always-low group for sedentary behavior had higher FVC at 18 years (β = 0.177; 95% CI:0.027;0.327) than boys in the always-high group in adjusted analysis. No significant association was found for girls in crude and adjusted analyses.

Table 3 Crude and adjusted analyses of sedentary behavior trajectory from 11 to 18 years of age and pulmonary function parameters at 18 years of age by sex

Discussion

In our study, we evaluated the association between the trajectory of screen-based sedentary behavior during adolescence and pulmonary function at 18 years of age. This is one of the first studies on this topic and the first to evaluate the association in a young population. We did not find consistent associations between time spent on television, video games, and computers and pulmonary function at age 18 for boys and girls after adjustment for potential confounders. The only significant adjusted association was found between sedentary behavior and FVC in boys; those boys with lower sedentary behavior showed higher values of FVC at 18 years.

Studies evaluating the relationship between screen-based sedentary behavior and pulmonary function are scarce in the literature. The only study to our knowledge that evaluated the association between sedentary behavior and pulmonary function was carried out in individuals from 45 to 74 years of age [42]. The authors of this study did not find association between television viewing and change in FEV1. However, comparing to our results is difficult since we evaluated sedentary behavior trajectory during adolescence rather than adulthood. To date there have been no other longitudinal studies evaluating this relationship in young populations. We found that boys with lower sedentary behavior during adolescence had higher FVC at 18 years compared to boys with higher sedentary behavior. Since this was the only significant association found after adjustment for potential confounders, we cannot refuse the possibility of residual confounding.

The study of the consequences of sedentary behavior on health is a relatively new paradigm in the physical activity field [43]. There is no consensus yet in the literature regarding the association between physical activity and pulmonary function. Some longitudinal studies have shown a positive association in children and adolescents [44, 45], and in adults [46]. One of these studies was carried out with the same population as in the current study [45]. Although sedentary behavior may be related to physical activity, the association between them in young individuals is weak, suggesting that these behaviors do not necessarily displace one another [47]. Sedentary behavior is not the opposite of physical activity; they are different behaviors with independent determinants [48]. Despite of no consistent association was found between more time spent in sedentary behavior and reduced pulmonary function, spending excessive time in sedentary behavior may have negative consequences on health outcomes. A meta-analysis showed that for children and adolescents there is strong evidence of association between sedentary behavior and obesity and moderate evidence for the association between sedentary behavior and blood pressure, total cholesterol, physical fitness, self-esteem, and social behavior problems [9].

The mechanisms through which physical activity and sedentary behavior might impact pulmonary function remain unclear. A possible explanation may be that low physical activity levels and excessive sedentary behavior are associated with lower level of physical fitness or increased body size [19, 49], resulting in reduced pulmonary function. A recent study showed that spending more time in sedentary behavior per day was associated with lower cardiorespiratory fitness, independent from higher intensity physical activity [49]. Cross-sectional studies have found a positive association between physical fitness and higher values of pulmonary function [50, 51]. Bae et al. [51] found a significant positive correlation between muscle strength and power with FEV1 and FVC values in students aged 6–17 years. Also, Lazarus et al. [50] found that percentage body fat was negatively associated with FVC in adults, while fat-free mass and muscle strength showed a positive association. Moreover, sedentary activity, such as television viewing, has been associated with consumption of high-density foods [52, 53] and obesity [9, 13]. Excess fat mass may impair ventilatory mechanics because of the stiffness of the thoracic cage due to fat accumulation around the ribs, abdomen and diaphragm [54] or even due to systemic inflammation that may cause airway inflammation and a consequent alteration in pulmonary function [55]. Thus, the possible association between sedentary behavior and pulmonary function might be explained by this mediating effect of obesity and fat distribution [42]. Another possible explanation of the association between screen-based sedentary behavior and pulmonary function may be the different respiratory patterns during sedentary activities. There is some evidence that prolonged periods of watching videotapes is associated with a decreased frequency of spontaneous sighs, a physiologic phenomenon that helps regulate airway tone [56]. More research on this is needed to better understand these relationships in a longitudinal way.

Our study has several strengths. It was carried out in a large population-based sample with high rates of retention and follow-up, minimizing the likelihood of selection bias. The longitudinal design allows the assessment of temporality between sedentary behavior and later adolescent pulmonary function. In addition, the sedentary behavior trajectory was evaluated through group-based trajectory modeling, a robust method used to identify groups of individuals with similar developmental trajectories [38, 39]. Approximately 90% of the spirometric test data in the study reached international quality criteria [35]. As noted earlier, our study is the first to evaluate the association between screen-based sedentary behavior and pulmonary function in adolescents.

The major limitation of our study is the self-reported screen-based sedentary behavior data. Self-reported data may lead to misclassification or bias, and might reduce the chance of identifying associations. However, objective measures have limitations as well, and questionnaires are widely used to measure sedentary behavior in population-based studies [57]. Another limitation for measuring and analyzing sedentary behavior is the lack of consensus in the literature regarding cut-point for classifying an individual as sedentary [58]. The trajectory groups used in our analyses might not adequately represent categories with differential risk. However, we also analyzed the outcome as a continuous variable and the results were similar (Additional file 1: Table S1). The possibility of over-reporting the time spent on screen activities due to the use of more than one kind of screen at the same time may also be a limitation. In order to minimize this problem, we excluded from the analysis those adolescents who reported extremely high numbers of hours of sedentary behavior.

Conclusion

In conclusion, this study did not find consistent association between screen-based sedentary behavior trajectory during adolescence and pulmonary function at age 18 among participants from a birth cohort study in Brazil. These findings show that spending excessive time in sitting activities such as television viewing, video game playing or computer use may not impair pulmonary function in youth. Since to the best of our knowledge this is the first study to examine the association between sedentary behavior and pulmonary function in adolescents, further investigation on this subject is needed. Studies evaluating sedentary behavior by objective measures and investigating the possible mediators, as well as the possible influence of physical activity and obesity in the relationship between sedentary behavior and pulmonary function are important to provide more information on this issue.

Abbreviations

FEV1 :

Forced expiratory volume in 1 s

FVC:

Forced vital capacity

PEF:

Peak expiratory flow

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Acknowledgements

The authors would like to thank the adolescents and the staff for participating in the 1993 Pelotas Birth Cohort, and also the Wellcome Trust, the European Union, the National Support Program for Centers of Excellence (PRONEX), the Brazilian National Research Council (CNPq), and the Brazilian Ministry of Health for providing financial support to this cohort study.

Funding

The 1993 Pelotas Birth Cohort Study is currently supported by the Wellcome Trust through the program entitled Major Awards for Latin America on Health Consequences of Population Change (Grant: 086974/Z/08/Z). The European Union, National Support Program for Centers of Excellence (PRONEX), the Brazilian National Research Council (CNPq), and the Brazilian Ministry of Health supported previous phases of the study. BGCS received financial support from CAPES (Brazil). None of the funding organizations of this study influenced the study design, data collection, data analysis, data interpretation, or writing of the manuscript.

Availability of data and materials

The dataset supporting of this article are available upon request to the corresponding author.

Authors’ contributions

BGCS and FCW led the analysis of this paper. AMBM and MP contributed to results interpretation. BGCS drafted the manuscript. AMBM, FCW, FCB, and MP collaborated with the critical revision of the manuscript. All authors read, revised and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Not applicable.

Ethics approval and consent to participate

All data collections were approved by the Ethics Committee of the Medical School of the Federal University of Pelotas. Participants signed a written informed consent at each visit. If participants were younger than 18 years of age, a parent or guardian signed the consent form.

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Correspondence to Bruna Gonçalves C. da Silva.

Additional file

Additional file 1: Table S1.

Crude and adjusted analyses of average cumulative sedentary behavior from 11 to 18 years of age and pulmonary function parameters at 18 years of age by sex. (DOCX 64 kb)

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da Silva, B.G.C., Menezes, A.M.B., Wehrmeister, F.C. et al. Screen-based sedentary behavior during adolescence and pulmonary function in a birth cohort. Int J Behav Nutr Phys Act 14, 82 (2017). https://0-doi-org.brum.beds.ac.uk/10.1186/s12966-017-0536-5

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