Postural balance in children with Autism Spectrum Disorders

ABSTRACT

Purpose:

to characterize the performance of children with autism spectrum disorders in two postural balance assessment scales.

Methods:

an observational cross-sectional study with a descriptive, analytical profile. Seven to 11-year-old children with mild autism spectrum disorder, diagnosed by an interdisciplinary team, according to the DSM-5, were assessed. The protocols used were the Sensory Organization Test and Pediatric Balance Scale.

Results:

all the children obtained maximum performance in the Sensory Organization Test. As for the Pediatric Balance Scale, the participants had similar responses in 8 out of its 14 items; in the other 6, there was a standard deviation.

Conclusion:

the participants did not have difficulties performing the Pediatric Balance Scale and Sensory Organization Test, scoring quite close to the maximum value.

Keywords:
Autistic Disorder; Vestibular Diseases; Postural Balance; Sensation Disorders; Child; Child Behavior

RESUMO

Objetivo:

caracterizar o desempenho de criança com Transtorno do Espectro Autista em duas escalas de avaliação do Equilíbrio Postural.

Métodos:

estudo de interferência observacional, com segmento transversal e de perfil descritivo analítico. Foram avaliadas crianças com diagnóstico de TEA de grau leve segundo o DSM-5, diagnosticadas por equipe interdisciplinar, com idade entre 7 e 11 anos. Os protocolos utilizados foram o Teste de Organização Sensorial e a Escala de Equilíbrio Pediátrica.

Resultados:

todas as crianças apresentaram desempenho máximo no Teste de Organização Sensorial. Na Escala de Equilíbrio Pediátrica, dos 14 itens presentes, os participantes apresentaram respostas semelhantes em oito deles, e nos seis demais houve desvio padrão.

Conclusão:

os participantes não demonstraram dificuldades na realização na EEP e no Teste de Organização Sensorial, mantendo escores muito próximos do valor máximo.

Descritores:
Transtorno Autístico; Doenças Vestibulares; Equilíbrio Postural; Transtornos das Sensações; Crianças; Comportamento Infantil

Introduction

Postural balance (PB) is the person’s ability to maintain their body in the desired position, which may be either static or dynamic. PB is made possible by the interaction between the proprioceptive, vestibular, and visual systems^1,2.

The proprioceptive system informs the body position in relation to surfaces¹, while the vestibular system informs the head localization in space and transmits information about the body, in relation to the environment, to the central nervous system.

Dizziness and PB problems are present in 5.3% of children and adolescents in the United States³. Children aged 7 years or older can convey better the characteristics of their PB problems⁴.

Everyday movements, such as reaching, grasping, walking, and looking are controlled with the integrated activity of neurocognitive processes, sensory processes, and reflexes. Ongoing movements must be planned, started, guided, monitored, and adjusted to accommodate environmental contingencies⁵.

PB is one of the requirements necessary to full motor development, daily activity performance, and social interaction adjustment^6,7. In the case of children, maintaining posture is particularly important, as they are intensely exploring their motor skills and need PB to reach motor development milestones⁸. During childhood, various deficits, dysfunctions, and disorders may appear, changing the typical course of child development. Childhood may be severely impacted by motor difficulties and other disorders because they further decrease the child’s participation in activities with peers, hindering their social interaction and development⁵.

According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), neurodevelopmental disorders are deficits that appear during child development and last throughout their life. Although the DSM-5 describes various disorders, the motor characteristics are not considered diagnostic criteria for most of them⁹. Individuals with these disorders typically have heterogeneous characteristics. Associations between neurodevelopmental disorders are also quite common. It is known that the more comorbidities children have, the worse their performance in various activities is. Children with autism spectrum disorders (ASD) may secondarily have language disorders, attention-deficit/hyperactivity disorder, intellectual disability, and so forth^9,10.

ASD is a neurodevelopmental disorder with abnormalities in two groups of characteristics. The first one encompasses language, interaction, and social reciprocity difficulties, while the second one is characterized by repetitive patterns and restricted interests. Sensory abnormalities - which may involve sensory discrimination, perception, and modulation - are described in the second group^11,12. Children with ASD frequently have a hypo- or hyperresponsiveness pattern regarding sensory stimuli⁹.

Though not considered diagnostic criteria for the disorder, motor planning and motor coordination difficulties and atypical gait are also reported⁹. Studies showing sensory discrimination, modulation, and perception difficulties - which are also seen as causes of ASD severity and prognostic - are frequently present in the literature, as well^8,13. These children’s sensory abnormalities explain their aggressiveness, stereotypies, and repetitive patterns^9,13.

People with sensorimotor disorders tend to have difficulties maintaining PB because it characteristically integrates three sensory systems. Therefore, children with ASD are expected to have PB difficulties, as some studies describe^14-16.

PB regulation is not directed by reflex alone since the upper centers, such as the motor cortex, the basal ganglia, the cerebellum, the vestibular cortex, and the brainstem are involved⁵. Various studies have found that PB is impaired in cases of ASD and that postural abnormalities are predictive of ASD symptomatology^17,18. More specifically, the increase in postural sway seems to reflect the patients’ impaired perception of body movement in relation to their postural limitation boundary, as well as a decreased capacity to separate the distinct ankle and hip movements to align their body when standing¹⁹.

The more associated difficulties a child has, the worse their prognosis is because integrating sensory information becomes more difficult. As many neural pathways are shared, children with attention deficits, for instance, have greater trouble maintaining their PB while coping with outer stimuli¹⁰.

Thus, this study aimed to characterize the performance of children presented with ASD on two PB assessment scales.

Methods

This is an observational cross-sectional study with a descriptive, analytical profile, approved by the Central Research Ethics Committee of the University Hospital Onofre Lopes, (HUOL, in Portuguese), Brazil, under number 3.232.724. It was carried out at the Center for Health Education and Research Anita Garibaldi (CEPE, in Portuguese), located in Macaíba, Rio Grande do Norte, Brazil.

The sample was selected by convenience, analyzing the medical records available at the CEPE. The eligibility criteria were as follows: 7- to 11-year-old children with mild ASD, diagnosed by an interdisciplinary team according to the DSM-5, with an absence of comorbidities or lesions associated with ASD, not taking medications that might interfere with PB, and without a specific diagnosis of postural abnormality. Children who did not finish the assessment were excluded. All the parents/guardians signed the informed consent form. Two children were excluded because they did not finish the assessment.

The assessments, in which the parents were present, took place at the CEPE and lasted 45 minutes on average. At first, parents were told how the PB assessment would be conducted, and which items would be assessed. The evaluator asked the child to perform the protocol tasks, giving examples and making it fun. In the end, the test results were explained to the parents.

PB was assessed with two protocols. The first one was the Sensory Organization Test (SOT), whose analysis reveals the sensory interaction between the visual, vestibular, and proprioceptive systems. No recommendations were found regarding the minimum or maximum age to take the test which comprises four sensory conditions described below²⁰. The responses to the four tasks are scored from zero to 100, observing the presence or absence of body sway. Scores from zero to 59 are considered as fall; from 60 to 69, risk of fall; and from 70 to 100, normal²¹. The overall balance index, calculating the arithmetic mean of the values found in the four testing conditions, was also measured. The child was asked to maintain each of the sensory conditions in the test for 30 seconds. They were as follows:

• Condition 1: Patient in orthostatic position, eyes open, on an even and steady surface.

• Condition 2: Patient in orthostatic position, eyes closed, on an even and steady surface.

• Condition 3: Patient in orthostatic position, eyes open, on a foam surface.

• Condition 4: Patient in orthostatic position, eyes closed, on a foam surface.

Then, the Brazilian version of the Pediatric Balance Scale (PBS), which has been translated to Portuguese²² was applied. This is an adaptation of the Berg Balance Scale (BBS), whose purpose is to assess the risk of falls in older adults. The pediatric version was developed for schoolchildren aged 5 to 15 years and it assesses the static and dynamic PB with 14 items (Figure 1). Its tasks simulate activities of daily living. In each item, the score ranges from 0 to 4 points, summing a total score of 56 points - the highest score represents the child’s full ability to perform all the tasks.

Figure 1:
Description of the items in the Pediatric Balance Scale

Data with descriptive statistics, with median, interquartile range, mean, and standard deviation, were analyzed.

Results

Initially, 14 children aged 7 to 12 years - one girl and 13 boys - participated in this study. All the parents/guardians were fully informed of the assessment procedures and agreed to participate. However, two children (a boy and a girl) were unwilling to continue after beginning the tests and were excluded from the research. Hence, the final sample comprised 12 boys aged 7 to 11 years (mean 8 and a half years). In general, the participants were receptive to the tasks, which they performed after fun examples and instruction.

The sample children had heterogeneous characteristics but the same diagnosis. Children number 1, 2, 3, and 4 had equine-assisted therapy on the assessment date. The other ones had undergone multidisciplinary assessments and their families had received instructions, but they were not having therapy at the time of the assessments.

The PBS results varied between the participants, whereas all the children had maximum performance in the SOT. No child had dizziness or was at risk of fall - there was a little more sway in condition 4 but with no significant change. Figure 2 shows the children’s scores in each PBS item, revealing that most of them had maximum performance in each task.

Figure 2:
Responses of the participants in the Pediatric Balance Scale

The participants had similar responses in the PBS - only items 7, 8, 9, 10, 11, and 14 had a standard deviation, as shown in Table 1. Other tasks were analyzed, but the values of both the standard deviation and interquartile range were zero, as the participants obtained the same scores in the tasks.

Table 1:
Descriptive analysis of items 7, 8, 9, 10, 11, and 14 of the Pediatric Balance Scale in children with autism spectrum disorder

	Mean±SD	Median (IQR 25-75%)	Reference values
PBS	54.42±1.67	55 (54 - 55.75)	0 - 56
Item 7	3.75±0.62	4 (4 - 4)	0 - 4
Item 8	3.50±1.16	4 (3.25 - 4)	0 - 4
Item 9	3.66±0.49	4 (3 - 4)	0 - 4
Item 10	3.91±0.28	4 (4 - 4)	0 - 4
Item 11	3.91±0.28	4 (4 - 4)	0 - 4
Item 14	3.66±0.65	4 (3.25 - 4)	0 - 4

• Captions:
• SD: standard deviation; IQR: interquartile range; PBS: Pediatric Balance Scale
• Item 7: Standing with feet together
• Item 8: Standing with foot in front
• Item 9: Standing on one foot
• Item 10: Turning 360 degrees
• Item 11: Turning to look behind
• Item 14: Reaching forward with outstretched arm

Discussion

The objective of this study was to characterize the performance of children with ASD on two PB assessment scales. In the SOT, the participants obtained maximum values in all four conditions. In the PBS, the final scores varied but with a rather small standard deviation.

The studies by Lim et al.¹³ and Gouleme et al.²³ compare PB performance between typical children (control group) and children with ASD. The review by Lim et al.¹³ assessed 434 people with ASD and 551 with typical development, aged 3 to 52 years. The study by Gouleme et al.²³ compared 30 children with typical development with another 30 children with ASD, mean age of 12.1±2.9 years. In both studies, the children with ASD had an inferior performance in the PB assessments than those with typical development. The methodological differences may have led to the result in this study, in which there was no abnormal balance, unlike the said articles^13,23.

Darr et al. (2015)²⁴ conducted a PBS psychometric study in 2- to 13-year-old children with typical development. Even though 37% of those children obtained maximum scores, in general, the final scores varied little²⁴ - similar to those found in this study.

The PBS is a validated protocol that proved to be sensitive in PB assessment of children with Down syndrome²⁵, chronic encephalopathy²⁶, and visual disability²⁷. However, no abnormalities were found in the assessment of this study population - 25% of the children obtained maximum scores and 67% had slightly lower performance.

In general, the more a child with ASD has associated comorbidities and difficulties, the worse their performance in activities of daily living is - depending on the age at diagnosis and whether there have been adequate interventions. In Radonovich et al.¹⁴, one reads that children with stereotypies had more PB difficulties. Lim et al.¹³ noticing that children with ASD use the visual system more than the others in the PB tasks, in comparison with typical children. Gouleme et al.²³ observed that, when exposed to tasks that require more attention, children with ASD have more postural sways on the force platform than expected. In the literature in general, the assessments are made in children with mild autism because of the complexity of the PB tests. Likewise in this study, the children with mild ASD and no specific diagnosis of postural abnormality had adequate PB in the tools used to assess them.

The children’s lowest performance in the PBS occurred in items 7, 8, 9, 10, 11, and 14, which require them, respectively, to stand with feet together, stand with a foot in front, stand on one foot, turn 360 degrees, turn to look behind, and reach forward with outstretched arms.

Tasks that narrow down the base of support, such as items 7, 8, and 9, increase the sway in children with ASD. The psychometric study²⁴ revealed that 82%, 48%, and 48% obtained maximum performance in these tasks, respectively.

Tasks 10 and 11 assess dynamic PB. One child had a lower score in these two items, which require broad motor coordination and dual-task attention. Miller et al.²⁸ and Bucci et al.²⁹ observed that the PB in children with ASD decreased when they had abnormal broad motor coordination and dual-task attention. In this study, it was seen that children with difficulties in these skills obtained a lower total score. Item 14 is considered an assessment in itself, known as Functional Reach Test. As demonstrated by Duncan et al.³⁰, this task assesses PB using body displacement and measuring its maximum capacity. Three children obtained the maximum score in the present study. In the psychometric study, children with ASD in this study had a performance similar to that of typical children.

The SOT assesses the interaction between the vestibular, visual, and proprioceptive systems, which maintains PB. The postural sway in this study was not significant, although the participants were more resistant to the task that required them to stand with a blindfold. All the children were able to stand for the 30 seconds of the test.

In the literature, more difficulties in computerized posturography are verified, which enables the evaluators to digitally observe the interaction between the sensory systems responsible for PB^19,23,29-32. These assessments detect even the slightest body sway and the children’s need for a larger base of support.

One of the characteristics of ASD in the DSM-5 is hypo- or hyperresponsiveness to sensory stimuli. Sensory integration difficulties are also described as a requirement in ASD. The SOT may not be sensitive enough to detect slight PB sway in children with mild ASD.

Despite being a protocol often used to assess balance in children, the PBS did not reveal abnormal results in the assessment of this group of children with mild ASD. The tasks seemed too easy for this group at times. Likewise, the SOT without computerized posturography did not have abnormal results. One infers that technological devices, such as force platforms and computerized posturography, can better detect slight sway in children with mild ASD. It must be highlighted that no previous assessment in this study sample verified abnormal PB, which prevents us from extending the result to analyze the instruments’ sensitivity. One of the limiting factors in this study is the sample size. Due to the strict eligibility criteria, many children were not recruited for assessment. The children’s medical records were analyzed, in order to select them and recruit the ones that met the inclusion criteria. Children with a more severe ASD, with severe cognitive impairment or some associated disability, were not assessed. Further studies with larger samples that reliably represent children with ASD are recommended. Moreover, the control group should be assessed, and the variables should be better controlled. Hence, the results can be extended.

Conclusion

The participants did not have difficulties performing the PBS and SOT and obtained scores quite close to the maximum. According to the assessment with these scales, the children with ASD did not have PB abnormalities.

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Publication Dates

• Publication in this collection
  25 Oct 2021
• Date of issue
  2021

History

• Received
  15 Feb 2021
• Accepted
  24 Aug 2021