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Research ArticleOriginal Research

Reference Equations for the ADL-Glittre Test in Pediatric Subjects

Renata Martins, Tatiana G Bobbio, Anamaria F Mayer and Camila IS Schivinski
Respiratory Care August 2019, 64 (8) 937-944; DOI: https://doi.org/10.4187/respcare.06619
Renata Martins
Health and Sports Science Center, Physiotherapy Department, Santa Catarina State University, Florianópolis, Brazil.
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Tatiana G Bobbio
Texas A&M University, College Station, Texas.
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Anamaria F Mayer
Health and Sports Science Center, Physiotherapy Department and Postgraduate Program, Santa Catarina State University, Florianópolis, Brazil.
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Camila IS Schivinski
Health and Sports Science Center, Physiotherapy Department and Postgraduate Program, Santa Catarina State University, Florianópolis, Brazil.
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  • For correspondence: [email protected]
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Abstract

BACKGROUND: The ADL-Glittre test (TGlittre) was initially proposed to evaluate the activities of daily life (ADL) of adults with COPD that involve activities with the upper limbs in addition to walking. Recently, the test has been adapted for children (TGlittre-P), but no reference values have been proposed for its use in this population. The main objective of this study was to develop reference equations for the pediatric adaptation of the TGlittre.

METHODS: A cross-sectional study carried out over a period of 19 months. Children 6–14 y old participated in the study. The study was rigorously controlled based on the International Study of Asthma and Allergies in Childhood (ISAAC) questionnaire and on normal spirometry. Study subjects were evaluated for their biometric data (ie, weight, height, body mass index, body surface area, and length of the lower limbs) and spirometric data. Subjects then performed 2 TGlittre-P tests with an interval of 30 min between them. Statistical analysis included a Pearson correlation test to verify a correlation between time spent on the TGlittre-P and biometric variables such as gender and age. Subsequently, a multiple regression analysis was conducted for those variables. The level of signficance was set at a P of 0.05.

RESULTS: Eighty-seven children (44 girls) participated in the study. Age was the predictive variable with the greatest influence on the time spent on the TGlittre-P (male: adjusted R2 = 39.6%; female: adjusted R2 = 25.2%). The following equations were established: time spent on the TGlittre-P = 3.781 − 0.083 × age (female), and time spent on the TGlittre-P = 4.025 − 0.123 × age (male).

CONCLUSIONS: TGlittre-P reference equations were developed for females and males, with age being the most influential predictive variable in the test performed by children.

  • child
  • activities of daily living
  • functional capacity
  • evaluation
  • outcome assessment
  • reference values

Introduction

Children with lung diseases often show loss of physical capacity and limitations in their activities of daily life (ADL),1,2 most of which are performed with submaximal efforts. The performance of ADLs reflects functional capacity,3 and submaximal tests have been presented as effective evaluation instruments.4 For this reason, the 6-min walk test (6MWT) is frequently used because it is easy to apply, inexpensive, and valid and reliable as a measure in children.5–7 There are studies that have proposed values and reference equations for predicting the distance covered in the test,8 which may further aid in the evaluation of the functional capacity of sick children, as well as in the verification of the effects of the therapeutic intervention in those patients.9,10

However, the test does not identify the limitation in upper limb activities, which are often involved in habitual ADLs.11,12 In this context, the ADL-Glittre test (TGlittre) was created to more fully evaluate essential ADLs in patients with COPD.11 Components of the assessment include activities such as carrying a backpack, sitting and standing up from a chair, going up and down steps, and moving objects with the upper limbs.11 The test has been shown to induce metabolic, ventilatory, and cardiovascular responses similar to the 6MWT,13 and results have been shown to correlate with results of the 6MWT in individuals with COPD11 and healthy adults.14

To date, most of the studies using the TGlittre have been limited to the population of healthy adults and elderly individuals with COPD and cardiovascular diseases.11,13–17 Only 1 study has been conducted in subjects with cystic fibrosis, including children, but the authors used the original protocol of the test.18 The TGlittre was adapted for children (TGlittre-P) with adjustments in its components to consider the child's weight and height.19 In addition, there is no research on the application of this exclusive pediatric age test, nor are there reference values for its use. The main objective of the study was to develop reference equations for time spent on the TGlittre-P performed by healthy children.

QUICK LOOK

Current knowledge

The ADL-Glittre test (TGlittre) includes multi-tasking and essential activities of daily life, and was designed with the purpose of assessing functional capacity more comprehensively. The test has been widely used in populations of adults with chronic diseases and has recently been adapted and validated for children (TGlittre-P).

What this paper contributes to our knowledge

Reference equations to predict performance by children were developed using the TGlittre-P, one for each gender. Age was identified as the variable with the greatest predictive power for time spent on the TGlittre-P in the developed equations.

Methods

This was an observational and cross-sectional analytical study that was carried out over a period of 19 months. The sample consisted of healthy children between the ages of 6 and 14 y old from private and public schools from the Great Florianópolis area in Santa Catarina, Brazil. We included subjects with no history of cardiorespiratory, musculoskeletal, rheumatic, neurological, or hearing and visual deficiencies (data obtained through a health questionnaire written by the researchers) and were not enrolled in high-performance sports federations (ie, non-athletes). We excluded children considered obese by the World Health Organization20 and any who were unable to perform or complete any of the evaluation procedures and activities proposed on the day of data collection. Subjects were also excluded if there was evidence of respiratory impairment categorized by the following scores in the asthma module of the International Study of Asthma and Allergies in Childhood (ISAAC)21 questionnaire (completed by their parents or legal guardians): > 5 points for children age 6–9 y old, and > 6 points for children 10–14 y old with a change in FEV1 and FVC < 80% of predicted, and a FEV1/FVC < 70% using the references of Polgar and Promadhat22 and Knudson et al.23

This study was approved by the Ethics Committee of the State University of Santa Catarina (CAAE: 07635412.3.0000.0118). Data were collected in the children's schools and at the State University of Santa Catarina. After reading and signing the Informed Consent Letter, parents or guardians of the children also completed a form, developed by the authors, about the general health of the children. Then identification forms with the children's data were completed. Finally, the children were evaluated for their biometric data (ie, weight, height, body mass index, body surface area,24 and lower limb length19) and spirometry results (FEV1, FVC, and FEV1/FVC ratio).25 After the first phase of evaluations and data analysis, all of the children compatible with the inclusion criteria were referred for the TGlittre-P.

The TGlittre Test Adapted for Children

The TGlittre-P19 has some modifications from the original protocol13 in terms of the weight of the backpack to be carried during the test, the height of the shelf, the weight of the objects to be moved on the shelf, and permission for a single verbal stimulus during the test. The TGlittre-P consists of carrying a backpack weighing 0.5–2.5 kg (ie, the weight depends on the child's gender, age, and weight, according to the World Health Organization26weight and height table) through a circuit with the following sequence of activities: starting from a seated position, the child walks in a flat corridor with a total length of 10 m, with a box at the halfway point (5 m) with 2 steps to climb and 2 steps to go down (Fig. 1). Each step is 17 cm high and 27 cm wide. After going up and down the steps and walking the remaining 5 m of the course, the child is faced with 2 shelves; the higher shelf (positioned at the height of the child's eyes) has 3 objects that each weigh 0.5 kg, and the child must move the objects one by one to the lower shelf (positioned at the height of the child's waist), and then the child must move them to the floor. The objects are then placed back on the lowest shelf, and then they are moved to the highest shelf. The child then returns along the course until reaching the chair, at which point the child sits in the chair (ie, returns to the initial position). Immediately after (with the stopwatch still activated), the child repeats the ADL circuit. The total test includes 5 laps, and the child must complete them in the shortest possible time. Only the verbal stimuli “sit down,” and “stand up” are permitted during the test. The test can be suspended when necessary, without stopping the stopwatch. At the end of the test, the completion time is recorded.

Fig. 1.
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Fig. 1.

Representation of the ADL-Glittre test adapted for children (TGlittre-P). From Reference 19, with permission.

As in the original test, children were monitored throughout the course to track heart rate, SpO2, and dyspnea index (modified Borg scale).27 Blood pressure and breathing frequency were checked at the beginning of the test and at the end, with the child in a seated position.

Determination of Reference Values

For the determination of reference values, the TGlittre-P protocol was performed twice, with a 30-min interval between tests. The children remained at rest during the interval period, which was enough time for the cardiorespiratory parameters to return to baseline. The tests were explained and conducted by the same evaluator, as were the collection of control parameters during the test (heart rate, SpO2, and dyspnea index). A second researcher monitored breathing frequency and blood pressure to ensure that the parameters were checked immediately after the test was completed. The best test result was used for analysis.

Sample Size Calculation

For the calculation of the sample size, 2 objectives were considered: we needed to determine the mean (95% CI) of the TGlittre-P time parameter of each age group, specific for males and females, and we needed to determine the most appropriate model of the parameter considering age and height. To match the first objective, we analyzed the pilot study data (n = 10), from which the sample size was calculated for each gender.28 For this study, the SD of 9.6 s and a delta (Δ) of 3 s were considered to determine the 95% CI of the mean.29 These data showed that 40 students of each sex were estimated to be sufficient to obtain a good estimate of the average time spent on the TGlittre-P for children. To match the second objective, regression analysis, we considered a gender-specific model because sexual dimorphism plays an important role in cardiorespiratory assessments. For that model, 2 predictive variables were determined: age and height. Thus, when requiring at least 20 children for each predictive variable, the sample totaled 40 boys and 40 girls.28 Contemplating objectives 1 and 2, we estimated the sample size to be 40 children for each gender, for a total of 80 students.

Statistical Analysis

The data were transcribed to a spreadsheet with statistical analysis performed with SPSS software (version 20.0, IBM, Armonk, New York). Data were presented through descriptive statistics and frequencies, expressed as mean, SD, minimum, maximum, and median. The Shapiro-Wilk and Kolmogorov-Smirnov tests were used to evaluate the normality of the variables, and the Pearson correlation test (following the Dancey and Reidy classification30) was used to verify the correlation between the time spent on the TGlittre-P (dependent variable) and the variables of weight, height, age, and body mass index. Subsequently, simple linear regression models were developed for each predictive variable that showed a correlation with the dependent variable. Afterward, the predictive equations, specific to each gender, were developed with stepwise multiple linear regression. The probability for the inclusion of a predictive variable in the model was P ≤ .05. To choose the best model, the adjusted coefficient of determination (adjusted R2) and the theoretical reference adopted by the authors were considered. The mean time of this study was inserted into the best-generated model and compared to the reference values of the equation through the independent t test.

Results

A total of 185 children were eligible for the study (Fig. 2). Of these, 98 were excluded, leaving 87 subjects in the study (44 female and 43 male); 58 subjects were white (26 female), 15 were black (10 female), and 14 were brown-skinned (8 female). Descriptive data characterizing age, biometric data, spirometric parameters, final scores of the asthma module of the ISAAC questionnaire, and time spent on both TGlittre-P tests are described in Table 1, as is the comparison of the variables between the genders (P value on the independent t test).

Fig. 2.
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Fig. 2.

Flow chart. ISAAC = International Study of Asthma and Allergies in Childhood.

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Table 1.

Characterization of the Sample and Comparison Between Genders

The relationship between the main variables and the time spent on the TGlittre-P is shown in Table 2, based on the Pearson correlation coefficient values. Age was the variable that correlated most closely with the time spent on the test, with a moderate negative correlation.30 Subsequently, height and length of the lower limbs (right lower limb in boys and left lower limb in girls) also showed moderate negative correlations in both genders.30

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Table 2.

Correlation Between Time Spent on the TGlittre-P and Key Variables

The models of the developed equations, considering the variables of age, weight, height, and length of lower limbs, are described in Table 3. The highest coefficients of determination (R2 and adjusted R2) are related to the variable age. In that regard, the model was chosen to generate the estimated values of time spent on the TGlittre-P, and the comparison between the average time of the studied sample and the reference values from the equation was carried out (Table 3). The average time spent on the test, according to each age of the studied sample, was equal to or similar to the time proposed by the developed reference equation (considering the age variable). There was no statistical difference between the time estimated by the equation and the time verified in the sample (P = 0.550 (female), P = 1.000 (male)). Table 4 presents the subjects' performance on the TGlittre-P by age, as well as the value estimated by the equation that included the variable age.

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Table 3.

Reference Equations for the TGlittre-P and Comparison of Reference Values and Times Observed in the TGlittre-P Test

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Table 4.

Mean TGlittre-P Time Observed Compared to the Equation Estimate

Discussion

One of the main objectives of this study was to develop reference equations for the TGlittre-P test, recently published to evaluate the functional capacity of children.20 Children with respiratory diseases suffer from a reduction in their functional capacity, which consequently interferes with their quality of life.1,2,31,32 Knowing that the individual response to exercise provides information related to the respiratory, cardiac, metabolic, and muscular systems,33,34 this type of assessment is extremely important because it analyzes the individual's capacity to perform activities. Subsequently, the most commonly used test in children is the 6MWT, although it is not exclusively adapted for children. Studies show that results may be influenced by anthropometric factors, such as gender and age, and by previously established reference values and equations.7,8

The TGlittre test, which is useful in evaluating functional capacity in patients with COPD,11,14 has been discussed in studies that investigate the applicability of the test.11,13–18 However, no TGlittre tests have been performed exclusively with children, including the version adapted for children, the TGlittre-P.19 Despite the growing recognition of TGlittre-P, equations and reference values for this version of the test have not been developed yet. To our knowledge, ours is the first study to attempt such a proposal. Use of the TGlittre-P will enable evaluation of functional capacity in both healthy and sick children through a test that involves multiple tasks, and not just walking as with the 6MWT.

The proposal for adapting the test for pediatric application considered the fact that a child is in constant growth as well as physical and intellectual development.35 The test incorporates aspects that are age-appropriate. The adapted test proved to be feasible, and the children performed it effectively.19 The mean performance was 2.84 ± 0.41 min (equivalent to approximately 2 min 50 s), which was comparable to the time elapsed in the test performed by healthy adults (2.84 ± 0.45 min).17 However, subjects with COPD, the largest group currently benefitting from this evaluation,13 spent an average time of 4.77 ± 1.46 min (approximately 4 min 46 s). Consequently, a cutoff point of 3 min 30 s has been identified for adult patients with COPD who undergo TGlittre. The TGlittre has features designed for older patients with impaired functional capacity.16

Variables such as sex, height, age, race, and weight can greatly influence the results of lung function tests36 and physical capacity assessment.37 The results of our study corroborate this information, showing a significant difference between male and female children in the variables of body mass index (P = .039) and percent of predicted FEV1 (P = .02). Furthermore, this study set out to establish different reference equations for females and males. According to the literature, there is an influence of weight and height, but the greatest influence is that of age (adjusted R2 = 25.2% and 39.6% for girls and boys, respectively) over the time elapsed in the test. Our findings corroborate the study that developed reference equations for the TGlittre in adults, in which the variables age, height, and body mass index were also relevant for predicting performance in the test.17

A systematic review of reference values for the 6MWT in children and adolescents published in 2016 identified a total of 32 prediction equations for reference values. The variable age was included in most (64%) equations, followed by height (61%),8 because chronological age and biological maturation lead to increased height and body mass in children. The latter is, in general, a reflection of a larger amount of muscle mass.38 Moreover, the increased growth and development is responsible for a significant gain in muscle strength, speed, flexibility, endurance, agility, and cardiorespiratory fitness,38,39 which may reflect in a shorter test execution time for older children. In addition, biomechanical factors are directly related to those increases because the larger the body size, the longer the leg length, which generates a more efficient lever in the execution of the movements.39

The finding that age was the greatest influence on test results, similar to the 6MWT, reinforces what Malina et al40 found in their study. According to the authors, subjects who were advanced in sexual and skeletal maturity within a chronological age group performed better on tasks of strength, power, and speed compared to those who were less mature. Therefore, the TGlittre-P test result is influenced by the development process, considering that older children perform the test in a shorter time. A limitation of this study is the fact that we did not control for sexual maturation. Future studies should evaluate the influence of this variable on the performance of the test because it can be a determinant in the children's performance.

Another important aspect of in pediatrics is the measurement of the lower limbs; although we included this variable, it is not considered in functional tests. Children grow and have growth spurts, and thus larger stature may be related to longer lower limbs.38 These changes can result in greater stride and, consequently, higher velocity in the test. We found that lower limb length had a moderate negative correlation (female: −0.403 in the right lower limb and −0.406 in the left lower limb; male: −0.512 in the right lower limb and −0.506 in the left lower limb) with the time spent on the TGlittre-P, which counters the work of Malina et al.40

The influence of other measures and variables, in addition to lower limb measurement, should also be considered in the performance of tests like the TGlittre-P in children, such as muscular strength, wingspan, balance, coordination, and ability. The TGlittre-P is composed of several types of activities that integrate psychomotor elements, such as the need to be agile and coordinated to move objects quickly, balance during sitting and rising from the chair and going up and down steps, and muscle strength to be able to perform the whole test as quickly as possible. The analysis of those abilities and capacities is relevant because children manifest their acquisition or improvement at different times. Although these aspects were not evaluated directly in this study, they are evaluated indirectly with the execution of the TGlittre-P.

In addition to the inherent complexity of the test, there are other elements pertinent to the pediatric age group, whose growth process is influenced by genetic (intrinsic), environmental, nutritional, social, economic, and cultural (extrinsic) factors.41 Tests like this evaluate not only physical abilities, but they also indirectly evaluate motivational factors of the subject, willingness to perform requested activities, and the ability to understand instructions.

Another limitation of our study was that accelerometry evaluation was not introduced to verify the subjects' level of physical activity. However, special care was taken to exclude children who participate regularly in athletic activities. In addition, criteria related to global health should be considered for rating children as healthy.

From a functional point of view, the results of the TGlittre-P test performed by children was compatible with the time spent by a healthy adult, which provides a logical basis for clinical indication. In addition, the reference equations developed here may help the early assessment of functional capacity in children with respiratory diseases, as well as provide a means to follow up and verify the effect of treatment on those patients. To this end, studies evaluating the predictive validity of these equations in chronic childhood diseases, such as bronchiolitis obliterans, cystic fibrosis, asthma, and bronchiectasis, should now be conducted with the TGlittre-P. This test can also be used to identify general changes in functional capacity, both in children with respiratory diseases and in children with other conditions.

Conclusion

Reference equations to predict performance by children were developed on the TGlittre-P, one for each gender. Age is the most influential predictive variable in time spent on the TGlittre-P, an ideal test for assessing the functional capacity of children.

Footnotes

  • Correspondence: Camila IS Schivinski, Rua Pascoal Simone, 358, Coqueiros, Florianópolis-SC, CEP 88080-350, Brazil. E-mail: cacaiss{at}yahoo.com.br.
  • The authors have disclosed a relationship with the FUMDES/Government of the State of Santa Catarina.

  • Copyright © 2019 by Daedalus Enterprises

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Respiratory Care: 64 (8)
Respiratory Care
Vol. 64, Issue 8
1 Aug 2019
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Reference Equations for the ADL-Glittre Test in Pediatric Subjects
Renata Martins, Tatiana G Bobbio, Anamaria F Mayer, Camila IS Schivinski
Respiratory Care Aug 2019, 64 (8) 937-944; DOI: 10.4187/respcare.06619

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Reference Equations for the ADL-Glittre Test in Pediatric Subjects
Renata Martins, Tatiana G Bobbio, Anamaria F Mayer, Camila IS Schivinski
Respiratory Care Aug 2019, 64 (8) 937-944; DOI: 10.4187/respcare.06619
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