Attention and motor profiles in children with developmental coordination disorder: A neuropsychological and neuroimaging investigation.

AIM: This study aimed to (1) quantify attention and executive functioning in children with developmental coordination disorder (DCD), (2) assess whether some children with DCD are more likely to show attention difficulties, and (3) characterize brain correlates of motor and attention deficits. METHOD: Fifty-three children (36 with DCD and 17 without) aged 8 to 10 years underwent T1-weighted and diffusion-weighted magnetic resonance imaging, and standardized attention and motor assessments. Parents completed questionnaires of executive functioning and symptoms of inattention and hyperactivity. We assessed regional cortical thickness and surface area, and cerebellar, callosal, and primary motor tract structure. RESULTS: Analyses of covariance and one-sample t-tests identified impaired attention, non-motor processing speed, and executive functioning in children with DCD, yet partial Spearman's rank correlation coefficients revealed these were unrelated to one another or the type or severity of the motor deficit. Robust regression analyses revealed that cortical morphology in the posterior cingulate was associated with both gross motor skills and inattentive symptoms in children with DCD, while gross motor skills were also associated with left corticospinal tract (CST) morphology. INTERPRETATION: Children with DCD may benefit from routine attention and hyperactivity assessments. Alterations in the posterior cingulate and CST may be linked to impaired forward modelling during movements in children with DCD. Overall, alterations in these regions may explain the high rate of non-motor impairments in children with DCD. WHAT THIS PAPER ADDS: Children with developmental coordination disorder have difficulties in attention, processing speed, and executive functioning. Non-motor impairments were not interrelated or correlated with the type or severity of motor deficit. Posterior cingulate morphology was associated with gross motor skills and inattention. Gross motor skills were also associated with left corticospinal tract morphology.

Development of complex executive function over childhood: Longitudinal growth curve modeling of performance on the Groton Maze Learning Task.

This longitudinal study modeled children's complex executive function (EF) development using the Groton Maze Learning Task (GMLT). Using a cohort-sequential design, 147 children (61 males, 5.5-11 years) were recruited from six multicultural primary schools in Melbourne and Perth, Australia. Race/ethnicity data were not available. Children were assessed on the GMLT at 6-month intervals over 2-years between 2010 and 2012. Growth curve models describe age-related change from 5.5 to 12.5 years old. Results showed a quadratic growth trajectory on each measure of error-that is, those that reflect visuospatial memory, executive control (or the ability to apply rules for action), and complex EF. The ability to apply rules for action, while a rate-limiting factor in complex EF, develops rapidly over early-to-mid childhood.

Upper Limb Kinematics of Handwriting among Children with and without Developmental Coordination Disorder.

Background: Children with developmental coordination disorder (DCD) often experience difficulties with handwriting legibility and speed. This study investigates the relationship between handwriting and upper limb kinematics to characterize movement patterns of children with DCD and typically developing (TD) children. Methods: 30 children with and without DCD matched for age, gender, and parent education were compared across handwriting abilities using a standardized handwriting assessment of both copied and dictated tasks (A-A Handwriting). The 3D motion capture system (Qualysis) was used to analyze upper limb kinematics and characterize movement patterns during handwriting and contrasted with written output. Results: Children with DCD wrote fewer legible letters in both copying and dictation. Children with DCD also showed poor automatization of key writing concepts. Atypical wrist postures were associated with reduced legibility for children with DCD (F (1,27) 4.71, p = 0.04, p-η2 = 0.15); whereas for TD children, better legibility was associated with greater variations in movement speed, particularly of the wrist (rho = −0.578, p < 0.05). Conclusion: Results reflect different movement parameters influencing handwriting in children with DCD. An improved understanding of the movement characteristics during handwriting of these children may assist intervention design.

Cognitive and motor function in developmental coordination disorder.

AIM: To analyse the development of motor skill and executive function in school-aged children with and without developmental coordination disorder (DCD). METHOD: Using a longitudinal design, 186 children (86 males, 100 females) aged 6 to 11 years at Time 1 were tested over a 2-year period, 52 of whom were diagnosed with DCD at Time 1 (27 males, 25 females; mean age 8y 5mo, SD 1y 6mo) using DSM-5 criteria. The McCarron Assessment of Neuromuscular Development assessed motor status at Time 1 and at 2-year follow-up (Time 2). Executive function was assessed using a well-validated measure, the Groton Maze Learning Test. RESULTS: The DCD cohort at Time 1 had moderate incidence of executive function deficit (41%). Most importantly, at a group level, children with persisting DCD (across Times 1 and 2) also showed significantly lower levels of executive function than children with typical motor development at both time points. At an individual level, around 26% of children in this group had persisting executive function deficits relative to normal ranges of performance. INTERPRETATION: Children with persisting DCD are at significant risk of executive function issues. The combination of motor and cognitive issues as a potential risk factor in the longer-term development of children is discussed. WHAT THIS PAPER ADDS: Around half of children initially diagnosed with developmental coordination disorder (DCD) had the same diagnosis at 2-year follow-up. 41% of children with DCD have impaired executive function. Children with persisting DCD show poorer executive function than those with typical motor development or remitting DCD.

Dance and rehabilitation in cerebral palsy: a systematic search and review.

AIM: To conduct a review of research literature on the use of dance and movement with music (rhythmic auditory stimulation [RAS]) in the neurorehabilitation of children and adults with cerebral palsy (CP). METHOD: We conducted a systematic search and quality appraisal of the research literature on dance and RAS in CP. Additionally, we linked the research outcomes to the International Classification of Functioning, Disability and Health (ICF) framework. RESULTS: Studies showed preliminary evidence of the benefits of dance and RAS on body functions, particularly balance, gait, walking, and cardiorespiratory fitness for individuals with CP. Research gaps are evident across all domains of the ICF, particularly in the participation and environment domains. INTERPRETATION: To facilitate translation of quantitative research outcomes to the clinical classification of the ICF, a table was constructed that links traditional areas of quantitative rehabilitation research with the ICF categories highlighting areas of research strengths and areas where increased rigor is desirable. The potential for dance and RAS to have positive impacts on body functions, emotional expression, social participation, and attitudinal change are indicated areas for consideration in future research. WHAT THIS PAPER ADDS: The potential for dance and movement to music help balance, gait, and walking in children and adults with cerebral palsy. Research gaps are evident across International Classification of Functioning, Disability and Health domains, particularly participation and environment domains.

LA DANZA Y LA REHABILITACIÓN EN LA PARÁLISIS CEREBRAL: UNA BÚSQUEDA SISTEMÁTICA Y REVISIÓN: OBJETIVO: Realizar una revisión de la literatura de investigación sobre el uso de la danza y el movimiento con la música (estimulación auditiva rítmica [RAS]) en la neurorrehabilitación de niños y adultos con parálisis cerebral (PC). MÉTODO: Llevamos a cabo una búsqueda sistemática y una evaluación de calidad de la literatura de investigación sobre danza y RAS en PC. Además, vinculamos los resultados de la investigación al marco teórico de la Clasificación Internacional del Funcionamiento, de la Discapacidad y de la Salud (CIF), RESULTADOS: Los estudios mostraron evidencia preliminar de los beneficios de la danza y el RAS en las funciones corporales, particularmente el equilibrio, la marcha, la marcha y la capacidad cardiorrespiratoria para las personas con PC. Las brechas de investigación son evidentes en todos los dominios de la CIF, particularmente en los ámbitos de participación y medio ambiente. INTERPRETACIÓN: Para facilitar la traducción de los resultados de la investigación cuantitativa a la clasificación clínica de la CIF, se construyó una tabla que vincula las áreas tradicionales de investigación de rehabilitación cuantitativa con las categorías CIF. destacando áreas de fortalezas de investigación y áreas donde es deseable un mayor rigor. El potencial de la danza y el RAS para tener un impacto positivo en las funciones corporales, la expresión emocional, la participación social y el cambio de actitud son áreas identificadas para tener en consideración en investigaciones futuras.

DANÇA E REABILITAÇÃO EM PARALISIA CEREBRAL: UMA PESQUISA E REVISÃO SISTEMÁTICA: OBJETIVO: Conduzir uma revisão da literaturs sobre o uso da dança e movimento com música (estimulação auditiva rítmica [EAR]) na neuroreabilitação de crianças e adolescentes com paralisia cerebral (PC). MÉTODO: Conduzimos uma busca sistemática e avaliação de qualidade da literatura sobre dança e EAR em PC. Adicionalmente, relacionamos os resultados da pesquisa com a estrutura da Classificação Internacional de Funcionalidade, Incapacidade e Saúde (CIF). RESULTADOS: Os estudos mostraram evidência preliminar dos benefícios e EAR nas funções do corpo, particularmente equilíbrio, marcha, caminhar e aptidão cárdio-respiratória em indivíduos com PC. Lacunas nas pesquisas são evidentes em todos os domínios da Classificação Internacional de Funcionalidade, Incapacidade e Saúde , particularmente nos domínios de participação e ambiente. INTERPRETAÇÃO: Para facilitar a transição de resultados de pesquisas quantitativas para a classificação clínica da CIF, uma tabela foi elaborada para relacionar áreas tradicionais de pesquisas quantitativas em reabilitação com as categorias da CIF. Foram realçadas áreas de em que pesquisas estão fortes e áreas onde maior rigor é necessário. O potencial da dança e EAR para proporcionar impactos positivos nas funções do corpo, expressão emocional, participação social, e mudança atitudinal são indicados como áreas para consideração em futuras pesquisas.

International clinical practice recommendations on the definition, diagnosis, assessment, intervention, and psychosocial aspects of developmental coordination disorder.

AIM: These international clinical practice recommendations (CPR) for developmental coordination disorder (DCD), initiated by the European Academy of Childhood Disability (EACD), aim to address key questions on the definition, diagnosis, assessment, intervention, and psychosocial aspects of DCD relevant for clinical practice. METHOD: Key questions in five areas were considered through literature reviews and formal expert consensus. For recommendations based on evidence, literature searches on 'mechanisms', 'assessment', and 'intervention' were updated since the last recommendations in 2012. New searches were conducted for 'psychosocial issues' and 'adolescents/adults'. Evidence was rated according to the Oxford Centre for Evidence-Based Medicine (level of evidence [LOE] 1-4) and transferred into recommendations. For recommendations based on formal consensus, two meetings of an international, multidisciplinary expert panel were conducted with a further five Delphi rounds to develop good clinical practice (GCP) recommendations. RESULTS: Thirty-five recommendations were made. Eight were based on the evidence from literature reviews (three on 'assessment', five on 'intervention'). Twenty-two were updated from the 2012 recommendations. New recommendations relate to diagnosis and assessment (two GCPs) and psychosocial issues (three GCPs). Additionally, one new recommendation (LOE) reflects active video games as adjuncts to more traditional activity-oriented and participation-oriented interventions, and two new recommendations (one GCP, one LOE) were made for adolescents and adults with DCD. INTERPRETATION: The CPR-DCD is a comprehensive overview of DCD and current understanding based on research evidence and expert consensus. It reflects the state of the art for clinicians and scientists of varied disciplines. The international CPR-DCD may serve as a basis for national guidelines. WHAT THIS PAPER ADDS: Updated international clinical practice guidelines on developmental coordination disorder (DCD). Refined and extended recommendations on clinical assessment and intervention for DCD. A critical synopsis of current research on mechanisms of DCD. A critical synopsis of psychosocial issues in DCD, with implications for clinical practice. The first international recommendations to consider adolescents and adults with DCD.

To Explore the Validity of Change Scores of the Children's Hand-use Experience Questionnaire (CHEQ) in Children with Unilateral Cerebral Palsy.

AIMS: To explore the validity of change scores of the Children's Hand-use Experience Questionnaire (CHEQ). METHODS: Analysis of the CHEQ included 44 children (15 girls) between 6-16 years (median 9.0; IQR 8-11) with unilateral cerebral palsy, with baseline and post- (two-week intensive) intervention assessments using the Goal Attainment Scale (GAS) as external anchor for change. Hypotheses on the magnitude of expected change were formulated and correlation coefficients and effect sizes calculated. Receiver operating curve analysis was performed and the area under the curve (AUC) calculated to investigate the ability of CHEQ to discriminate between improvement and non-improvement according to GAS. RESULTS: All hypotheses about the magnitude of change were confirmed supporting longitudinal validity of CHEQ scales to measure change in the perception of bimanual performance. AUCs for the Grasp efficacy and the Time utilization were slightly below, and for the Feeling bothered slightly above the threshold. The latter one accurately discriminating between children that improved and did not improve according to the GAS. CONCLUSIONS: Evidence was found that CHEQ scales capture change in bimanual performance but with limited accuracy for two out of three scales. The validity of CHEQ change scores needs to be further explored in a wider population.

The relation between mirror movements and non-use of the affected hand in children with unilateral cerebral palsy.

AIM: In children with unilateral cerebral palsy (CP), it is widely believed that mirror movements contribute to non-use of the affected hand despite preserved capacity, a phenomenon referred to as developmental disregard. We aimed to test whether mirror movements are related to developmental disregard, and to clarify the relation between mirror movements and bimanual function. METHOD: A repetitive squeezing task simultaneously measuring both hands' grip-forces was developed to assess mirror movements by using maximum cross-correlation coefficient (CCCmax ) as well as strength measures (MMstrength ). Developmental disregard, bimanual performance, and capacity were assessed using a validated video-observation method. Twenty-one children with unilateral CP participated (Median age 10y 7mo, interquartile range [IQR] 10y 1mo-12y 9mo). Outcome measures of mirror movements were correlated to developmental disregard, bimanual performance, and capacity scores using Spearman's correlations (significance level: α<0.05). RESULTS: Mirror movements were not related to developmental disregard. However, enhanced mirror movements in the less-affected hand were related to reduced performance (CCCmax : ρ=-0.526, p=0.007; MMstrength : ρ=-0.750, p<0.001) and capacity (CCCmax : ρ=-0.410, p=0.033; MMstrength : ρ=-0.679, p<0.001). These relations were only moderate (performance:MMstrength : ρ=-0.504, p=0.010), low (capacity: MMstrength : ρ=-0.470, p=0.016) or absent for mirror movements in the affected hand. Additionally, seven children showed stronger movements in their less-affected hands when actually being asked to move their affected hand. INTERPRETATION: These findings show no relation between mirror movements and developmental disregard, but support an association between mirror movements and bimanual function.

The Effect of Bimanual Training with or Without Constraint on Hand Functions in Children with Unilateral Cerebral Palsy: A Non-Randomized Clinical Trial.

AIM: To compare the effect of bimanual training with or without constraint on manual functions in children with unilateral cerebral palsy (UCP). METHODS: Seventeen children aged 6-11 years with UCP participated in one of two intensive therapeutic camps: bimanual (n = 9) incorporating one hour of constraint ("Hybrid") or Bimanual (n = 8). Each camp met for 2 weeks, 5 days per week for 6 hours each day. The Assisting Hand Assessment (AHA) and the Jebsen Taylor Test of Hand Function (JTTHF) examined bimanual and unimanual functions pre, post- and 3-months post-intervention. RESULTS: A significant improvement was noted in AHA scores for both groups between the pre-, post- and three months post-intervention [Hybrid (F2; 16 = 85.5, p < 0.01); Bimanual (F2; 16 = 15.4, p < 0.01)] with no significant differences between groups over time (F2; 30 = 0.74, p = 0.48). For the JTTHF, a significant improvement was noted in the affected hand following the Hybrid program (F2; 30 = 7.45, p = 0.01), while following the Bimanual program a significant difference was noted only in the less-affected hand (F2; 16 = 6.02, p < 0.01]. CONCLUSION: Both interventions Hybrid and Bimanual were similarly effective for improving use of the affected hand in bimanual tasks. The unique contribution of each intervention, the Hybrid program on the affected and the Bimanual on the less-affected side, warrants further examination.

Cortical Reorganization following Injury Early in Life.

The brain has a remarkable capacity for reorganization following injury, especially during the first years of life. Knowledge of structural reorganization and its consequences following perinatal injury is sparse. Here we studied changes in brain tissue volume, morphology, perfusion, and integrity in children with hemiplegia compared to typically developing children, using MRI. Children with hemiplegia demonstrated reduced total cerebral volume, with increased cerebrospinal fluid (CSF) and reduced total white matter volumes, with no differences in total gray matter volume, compared to typically developing children. An increase in cortical thickness at the hemisphere contralateral to the lesion (CLH) was detected in motor and language areas, which may reflect compensation for the gray matter loss in the lesion area or retention of ipsilateral pathways. In addition, reduced cortical thickness, perfusion, and surface area were detected in limbic areas. Increased CSF volume and precentral cortical thickness and reduced white matter volume were correlated with worse motor performance. Brain reorganization of the gray matter within the CLH, while not necessarily indicating better outcome, is suggested as a response to neuronal deficits following injury early in life.

Brain Plasticity following Intensive Bimanual Therapy in Children with Hemiparesis: Preliminary Evidence.

Neuroplasticity studies examining children with hemiparesis (CH) have focused predominantly on unilateral interventions. CH also have bimanual coordination impairments with bimanual interventions showing benefits. We explored neuroplasticity following hand-arm bimanual intensive therapy (HABIT) of 60 hours in twelve CH (6 females, mean age 11 ± 3.6 y). Serial behavioral evaluations and MR imaging including diffusion tensor (DTI) and functional (fMRI) imaging were performed before, immediately after, and at 6-week follow-up. Manual skills were assessed repeatedly with the Assisting Hand Assessment, Children's Hand Experience Questionnaire, and Jebsen-Taylor Test of Hand Function. Beta values, indicating the level of activation, and lateralization index (LI), indicating the pattern of brain activation, were computed from fMRI. White matter integrity of major fibers was assessed using DTI. 11/12 children showed improvement after intervention in at least one measure, with 8/12 improving on two or more tests. Changes were retained in 6/8 children at follow-up. Beta activation in the affected hemisphere increased at follow-up, and LI increased both after intervention and at follow-up. Correlations between LI and motor function emerged after intervention. Increased white matter integrity was detected in the corpus callosum and corticospinal tract after intervention in about half of the participants. Results provide first evidence for neuroplasticity changes following bimanual intervention in CH.

Portable Touchscreen Assessment of Motor Skill: A Registered Report of the Reliability and Validity of EDNA MoTap.

Portable and flexible administration of manual dexterity assessments is necessary to monitor recovery from brain injury and the effects of interventions across clinic and home settings, especially when in-person testing is not possible or convenient. This paper aims to assess the concurrent validity and test-retest reliability of a new suite of touchscreen-based manual dexterity tests (called EDNA™MoTap) that are designed for portable and efficient administration. A minimum sample of 49 healthy young adults will be conveniently recruited. The EDNA™MoTap tasks will be assessed for concurrent validity against standardized tools (the Box and Block Test [BBT] and the Purdue Pegboard Test) and for test-retest reliability over a 1- to 2-week interval. Correlation coefficients of r > .6 will indicate acceptable validity, and intraclass correlation coefficient (ICC) values > .75 will indicate acceptable reliability for healthy adults. The sample were primarily right-handed (91%) adults aged 19 and 34 years (M = 24.93, SD = 4.21, 50% female). The MoTap tasks did not demonstrate acceptable validity, with tasks showing weak-to-moderate associations with the criterion assessments. Some outcomes demonstrated acceptable test-retest reliability; however, this was not consistent. Touchscreen-based assessments of dexterity remain relevant; however, there is a need for further development of the EDNA™MoTap task administration.

A multi-site study of functional outcomes following a themed approach to hand-arm bimanual intensive therapy for children with hemiplegia.

AIM: This study investigated the effects of a theme-based ('magic') variation of the hand-arm bimanual intensive therapy programme, in two different countries, in improving activity performance for children with hemiplegia, including those with severe movement restrictions. METHOD: Twenty-three children with spastic hemiplegia (13 males, 10 females; mean age 10y 7mo, range 7-15y; Manual Ability Classification System level I, two; level II, 13; level III, eight), participated in one of three, 2-week, summer camps. A within-participant experimental design was used with the Assisting Hand Assessment and Children's Hand Experience Questionnaire as primary outcome measures. Evaluations occurred immediately before the first day, on the last day, and 3 months after intervention. Two groups underwent additional assessments 2 weeks before the camp. RESULTS: Significant intervention effects were seen on the Assisting Hand Assessment (p=0.002) and on the Children's Hand Experience Questionnaire (p<0.001), the latter maintained at follow-up. The affected hand was reported to be used in 25% of bimanual activities before the camp, progressing to 93% after camp, and decreasing to 86% at follow-up. Severity of impairment did not influence progress. INTERPRETATION: This themed approach to intensive intervention showed positive results in bimanual use, with improvements in independence sustained at follow-up. Although children across camps and motor severity made progress, some questions remain about intensity and duration of intervention to optimize longer-term outcomes.

Evaluation of daily and social participation of children with Cerebral Palsy across different age groups with a focus on the 'F'-words: Function, family, fitness, fun, friends and future.

BACKGROUND: The impact of disability differs across cultures. This study aimed to determine the predictors of participation in children with cerebral palsy (CP) in Turkey, based on the six F-words. METHODS: Cross-sectional study exploring participation profiles of 450 children with CP, aged between 2 and 18 years. Pediatric Evaluation of Disability Inventory (PEDI) evaluated functional skills, and Assessment of Life Habits (LIFE-H) version 3.0 assessed daily and social participation. Hierarchical linear regression models were done to determine the predictors of participation in daily activities (PDA) and social roles (PSR) in three age groups (2-4, 5-13 and 14-18 years) based on the 6 F-words (mobility of PEDI for 'fitness'; four classification systems and self-care of PEDI for 'functioning'; social functions of PEDI for 'friends'; demographic information by parents for 'family'; the recreation of LIFE-H for 'fun'; and different stages of development for 'future'). RESULTS: The most important predictors for total PDA by age group were: self-care (p = 0.012) of PEDI in 2-4 y; self-care (p = 0.001) and mobility (p = 0.005) of PEDI in 5-13 y; GMFCS (p = 0.006) and mobility (p = 0.002) of PEDI in 14-18 y. Significant predictors for PSR differed by age group: self-care (p = 0.001) of PEDI in 2-4 y; self-care (p = 0.023) and mobility (p = 0.006) of PEDI in 5-13 y; and GMFCS (p = 0.004) and MACS (p = 0.003) in 14-18 y. CONCLUSIONS: Six F-words of function and fitness focussed on self-care in younger children with an increasing emphasis on mobility and ability levels according to age. Therefore, rehabilitation for different aspects of the functional levels is needed to improve participation in life across the six F-words framework; plus take into consideration context, age-differences, family's expectations, life requirements, environmental needs, and cultural differences.