Muscle power development during the first year of life predicts neuromotor behaviour at 7 years in preterm born high-risk infants

From Neural Command to Robotic Use: The Role of Symmetry/Asymmetry in Postural and Locomotor Activities

This article deepens a reflection on why and how symmetry/asymmetry affects the motor and postural behavior from the neural source, uterine development, child maturation, and how the notion of symmetry/asymmetry has been applied to walking robot design and control. The concepts of morphology and tensegrity are also presented to illustrate how the biological structures have been used in both sciences and arts. The development of the brain and the neuro-fascia-musculoskeletal system seems to be quite symmetric from the beginning of life through to complete maturity. The neural sources of movements (i.e., central pattern generators) are able to produce both symmetric or asymmetric responses to accommodate to environmental constraints and task requirements. Despite the fact that the human development is mainly symmetric, asymmetries already regulate neurological and physiological development. Laterality and sports training could affect natural musculoskeletal symmetry. The plasticity and flexibility of the nervous system allows the abilities to adapt and compensate for environmental constraints and musculoskeletal asymmetries in order to optimize the postural and movement control. For designing humanoid walking robots, symmetry approaches have been mainly used to reduce the complexity of the online calculation. Applications in neurological retraining and rehabilitation should also be considered.

Parameters characterizing the posture of preterm children in standing and sitting position

BACKGROUND

Systematic observations of fetal posture show that, although for most of the time the fetus does not have a preferred posture, it has a certain repertoire of repeated active postures. The observed postures cannot be considered random configurations of head and limb position: the fetus and the young infant have an active, but variable posture that is relatively unrelated to the orientation of the force of gravity.

MATERIALS AND METHOD

The study included 101 children, aged 6-7, including 50 preterm children, 48 boys and 53 girls (research group) and 51 full-term children; 22 boys and 53 girls (control group). The photogrammetric method with moire effect on Mora 4G CQ Elektronik was used to examine the body posture.

RESULTS

Significant statistical differences in GAMMA (p< 0.001) and KLL (p= 0.020) parameters in preterm children and in control group were noted. Both parameters presented higher value in the control group.

CONCLUSIONS

The posture of preterm children is characterized by a smaller angle of upper thoracic curvature and smaller angle of lumbar lordosis. The posture of preterm children in sitting position is characterized by a smaller angle of thoracic kyphosis. Preterm birth disturbs the development of proper antigravitational mechanism and causes possible posture dysfunctions at the age of 6.

Body Posture Asymmetry in Prematurely Born Children at Six Years of Age

Aims

The purpose of the study was to assess body posture asymmetries in the standing and sitting position in prematurely born children at six years of age.

Study Design and Subjects

We measured trunk symmetry in coronal plane. The study was carried out in a group of 101 children, aged 6-7 years, mean age of 6.63, including 50 preterm children born at gestational age <32 weeks (preterm group) and 51 full-term children (control group).

Outcome Measures

Trunk symmetry in coronal plane was measured using photogrammetric technique with Mora 4G CQ Elektronik. The subjects were examined in standing and sitting position. Statistical analyses were carried out using Shapiro-Wilk W-test, Student's t-test, Mann–Whitney U test, and Pearson's chi-squared test. Statistical significance was assumed at p < 0.05.

Results

No significant differences were found between the groups in the asymmetries identified in the relevant anthropometric points, relative to the position assumed during the examination or to the subjects' sex.

Conclusions

There are no significant differences in body posture in the coronal plane, between preterm children and full-term children. Premature birth does not have adverse effects related to body posture asymmetry in preterm children at the age of six.

Head Lag in Infancy: What Is It Telling Us?

OBJECTIVE

To investigate changes in head lag across postmenstrual age and define associations between head lag and (1) perinatal exposures and (2) neurodevelopment.

METHOD

Sixty-four infants born ≤ 30 wk gestation had head lag assessed before and at term-equivalent age. Neurobehavior was assessed at term age. At 2 yr, neurodevelopmental testing was conducted.

RESULTS

Head lag decreased with advancing postmenstrual age, but 58% (n = 37) of infants continued to demonstrate head lag at term. Head lag was associated with longer stay in the neonatal intensive care unit (p = .009), inotrope use (p = .04), sepsis (p = .02), longer endotracheal intubation (p = .01), and cerebral injury (p = .006). Head lag was related to alterations in early neurobehavior (p < .03), but no associations with neurodevelopment were found at 2 yr.

CONCLUSION

Head lag was related to medical factors and early neurobehavior, but it may not be a good predictor of outcome when used in isolation.

Subcutaneous fat accumulation in early infancy is more strongly associated with motor development and delay than muscle growth

AIM

Physical growth in neurologically healthy preterm infants affects motor development. This study investigated the separate relationships between muscle and fat in infancy and later motor development and physical growth.

METHODS

Muscle thickness and subcutaneous fat thickness of the anterior thigh were measured using ultrasound images obtained from neurologically healthy preterm infants at birth, 3, 6, 12 and 18 months' corrected age. We also obtained the Pediatric Evaluation of Disability Inventory and Alberta Infant Motor Scale scores at 18 months' corrected age to assess motor ability and motor delay.

RESULTS

Thirty preterm infants completed the study protocol. There was a significant positive correlation between motor ability and increments in subcutaneous fat thickness during the first 3 and 6 months' corrected age (r = 0.48 and 0.40, p < 0.05, respectively), but not between motor ability and muscle thickness growth in any of the periods. A secondary, logistic regression analysis showed that increments in subcutaneous fat thickness during the first 3 months were a protective factor for motor delay.

CONCLUSION

Subcutaneous fat accumulation in early infancy is more strongly associated with motor development and delay than muscle growth.

Developmental pathways to autism: a review of prospective studies of infants at risk

Autism Spectrum Disorders (ASDs) are neurodevelopmental disorders characterized by impairments in social interaction and communication, and the presence of restrictive and repetitive behaviors. Symptoms of ASD likely emerge from a complex interaction between pre-existing neurodevelopmental vulnerabilities and the child's environment, modified by compensatory skills and protective factors. Prospective studies of infants at high familial risk for ASD (who have an older sibling with a diagnosis) are beginning to characterize these developmental pathways to the emergence of clinical symptoms. Here, we review the range of behavioral and neurocognitive markers for later ASD that have been identified in high-risk infants in the first years of life. We discuss theoretical implications of emerging patterns, and identify key directions for future work, including potential resolutions to several methodological challenges for the field. Mapping how ASD unfolds from birth is critical to our understanding of the developmental mechanisms underlying this disorder. A more nuanced understanding of developmental pathways to ASD will help us not only to identify children who need early intervention, but also to improve the range of interventions available to them.

Prediction of gross motor development and independent walking in infants born very preterm using the Test of Infant Motor Performance and the Alberta Infant Motor Scale

BACKGROUND

One objective of a neonatal follow-up program is to examine and predict gross motor outcome of infants born preterm.

AIMS

To assess the concurrent validity of the Test of Infant Motor Performance (TIMP) and the Alberta Infant Motor Scale (AIMS), the ability to predict gross motor outcome around 15 months corrected age (CA), and to explore factors associated with the age of independent walking.

METHODS

95 infants, born at a gestational age <30 weeks, were assessed around 3, 6 and 15 months CA. At 3 months CA, correlations of raw-scores, Z-scores, and diagnostic agreement between TIMP and AIMS were determined. AIMS-score at 15 months CA and parental-reported walking age were outcome measures for regression analyses.

RESULTS

The correlation between TIMP and AIMS raw-scores was 0.82, and between Z-scores 0.71. A cut-off Z-score of -1.0 on the TIMP had 92% diagnostic agreement (κ = 0.67) with an AIMS-score < P10. Neither TIMP- nor AIMS-scores at 3 months CA were associated with the gross motor outcome at 15 months CA. The AIMS-scores at 6 months CA predicted the AIMS-scores at 15 months CA with an explained variance of 19%. Median walking age was 15.7 months CA, with which only the hazard ratio of the AIMS at 6 months CA and ethnicity were significantly associated.

CONCLUSIONS

Prediction of gross motor development at 15 months CA and independent walking was not possible prior to 6 months CA using the AIMS, with restricted predictive value. Cultural and infant factors seem to influence the onset of independent walking.

Fatores associados ao atraso do desenvolvimento motor de crianças prematuras internadas em unidade de neonatologia

OBJETIVOS: verificar a frequência do atraso do desenvolvimento motor em crianças prematuras internadas em unidade neonatal e identificar os fatores associados. MÉTODOS: estudo descritivo e analítico, realizado na Unidade Neonatal de uma maternidade de alto risco em Recife, Brasil. Avaliou-se o desenvolvimento motor, através do Test of Infant Motor Performance, de 98 crianças nascidas pré-termo com idade pós-conceptual mínima de 34 semanas, durante a internação, entre janeiro e julho de 2009. Analisaram-se associações entre variáveis maternas, neonatais e assistenciais com desenvolvimento motor. RESULTADOS: a média de idade pós-conceptual na avaliação foi de 37 semanas e 39,8% das crianças apresentaram desenvolvimento motor alterado (atípico ou suspeito). Fatores significativamente associados ao desenvolvimento motor alterado foram: menor peso ao nascer; maior idade na avaliação; maior número de consultas pré-natais; ocorrência de hipóxia e displasia broncopulmonar; maior tempo de permanência na unidade de terapia intensiva e unidade neonatal. Houve tendência significante a um pior desenvolvimento motor com uso de oxigenoterapia e ventilação mecânica prolongadas. CONCLUSÕES: crianças prematuras internadas podem apresentar atraso precoce do desenvolvimento motor, de forma grave ou limítrofe. Peso ao nascer, morbidades neonatais e assistência recebida na unidade neonatal foram os fatores que mais influenciaram o desfecho. Esses resultados justificam o início de estratégias preventivas e estimulação ainda no período de internação.

Maternal symptoms of anxiety during pregnancy affect infant neuromotor development: the generation R study

Several studies found that maternal symptoms of anxiety or depression are related to functioning and development of the offspring. Within a population-based study of 2,724 children, we investigated the effect of maternal anxiety or depression on infant neuromotor development. Symptoms of anxiety and depression were measured during pregnancy and after giving birth; infant neuromotor development was assessed by trained research nurses during a home visit at the age of 3 months. The current study showed that mothers who were anxious during pregnancy had an elevated risk of having an infant with non-optimal neuromotor development.

Avaliação longitudinal do desenvolvimento motor e da habilidade de sentar em crianças nascidas prematuras

Os bebês prematuros apresentam maior risco para atrasos na aquisição das habilidades neuromotoras. O objetivo do estudo foi detectar atrasos no desenvolvimento motor de crianças prematuras com baixo peso, analisar a evolução da habilidade do sentar e verificar a associação entre essa habilidade com outras aquisições motoras até os 8 meses de idade corrigida (IC). Foram avaliadas 10 crianças nascidas pré-termo, de ambos os sexos, dos 4 aos 8 meses de IC, pela escala motora infantil de Alberta AIMS (Alberta Infant Motor Scale). Cada criança foi avaliada três vezes, aos 4 para 5 meses, 5 para 6 meses, e 7 para 8 meses; os escores foram comparados para verificar alterações ao longo do tempo e identificação de possíveis atrasos no desenvolvimento motor. Os resultados mostram que, aos 7 para 8 meses, 30% das crianças apresentaram desenvolvimento motor atrasado e foram encaminhadas para tratamento fisioterapêutico. A habilidade de sentar foi melhorando progressiva e significativamente com a idade, tendo se mostrado fortemente correlacionada com outras posturas do desenvolvimento motor e com o escore total na AIMS.

Fetal programming of infant neuromotor development: the generation R study

The objective of the study was to examine whether infant neuromotor development is determined by fetal size and body symmetry in the general population. This study was embedded within the Generation R Study, a population-based cohort in Rotterdam. In 2965 fetuses, growth parameters were measured in mid-pregnancy and late pregnancy. After birth, at age 9 to 15 wks, neuromotor development was assessed with an adapted version of Touwen's Neurodevelopmental Examination. Less optimal neuromotor development was defined as a score in the highest tertile. We found that higher fetal weight was beneficial to infant neurodevelopment. A fetus with a 1-SD score higher weight in mid-pregnancy had an 11% lower risk of less optimal neuromotor development (OR: 0.89; 95% CI: 0.82-0.97). Similarly, a fetus with a 1-SD score larger abdominal-to-head circumference (AC/HC) ratio had a 13% lower risk of less optimal neuromotor development (OR: 0.87; 95% CI: 0.79-0.96). These associations were also present in late pregnancy. Our findings show that fetal size and body symmetry in pregnancy are associated with infant neuromotor development. These results suggest that differences in infant neuromotor development, a marker of behavioral and cognitive problems, are at least partly caused by processes occurring early in fetal life.

The assessment of minor neurological dysfunction in infancy using the Touwen Infant Neurological Examination: strengths and limitations

AIM

Little is known of minor neurological dysfunction (MND) in infancy. This study aimed to evaluate the inter-assessor reliability of the assessment of MND with the Touwen Infant Neurological Examination (TINE) and the construct and predictive validity of MND in infancy.

METHOD

Inter-assessor agreement was determined in a sample of 40 infants (24 males, 16 females) aged 3 to 12 months (25 born at term: gestational age 37-41wks, median 39; and 15 born preterm, gestational age 24-35wks, median 32). Thirty typically developing term infants (18 males, 12 females; gestational age 37-42wks, median 40) and 59 preterm infants (34 males, 25 females) born at <35 weeks' gestation (gestational age 25-34wks, median 29) participated in the validity study. They were neurologically assessed with the TINE at the corrected ages of 4, 6, 10, and 12 months and with the Hempel assessment at 18 months.

RESULTS

The findings indicated that MND can be assessed reliably (inter-assessor agreement: kappa=0.83). MND during infancy was related to prenatal, perinatal, and social factors, and in particular to preterm birth. Neurological condition during infancy was prone to change, but was related to neurological condition at 18 months at all ages tested.

INTERPRETATION

We conclude that MND can be determined reliably in infancy. Important considerations in the construct of MND in infancy are its relation to prenatal and perinatal factors, its limited stability, and its moderate predictive value.

Infants born preterm exhibit different patterns of center-of-pressure movement than infants born at full term

BACKGROUND

Infants born preterm are at risk for developmental impairments related to postural control.

OBJECTIVE

The purpose of this study was to determine whether infants born preterm and infants born at full term differed in postural control at 1 to 3 weeks after term age.

DESIGN

This study included 17 infants born preterm (mean gestational age=31.9 weeks, range=25.0-34.6) and 15 infants born at full term (mean gestational age=38.9 weeks, range=37.3-40.6). All infants were without diagnosed neurological or genetic conditions.

MEASUREMENT

Center-of-pressure (COP) data were recorded at 5 Hz while each infant was positioned supine on a pressure-sensitive mat in an alert behavioral state. Root mean square (RMS) displacement and approximate entropy (ApEn) were used to describe the COP movement variability in the time series. Differences between groups were identified using independent t tests.

RESULTS

The COP time series were found to be deterministic, suggesting order in the time series. Infants born preterm exhibited significantly larger RMS values in the caudal-cephalic direction than infants born at full term (1.11 and 0.83 cm, respectively; t=-2.6, df=30, P=.01). However, infants born at full term had significantly larger ApEn values in the caudal-cephalic direction (1.19 and 1.11, respectively; t=2.4, df=30, P=.02). The 2 groups did not differ in RMS or ApEn values in the medial-lateral direction or the resultant.

CONCLUSIONS

Infants born at full term exhibited COP displacements in the caudal-cephalic direction that were smaller in amplitude, but may be considered more complex or less predictable, than those of infants born preterm. One explanation is that infants born preterm exhibited more stereotypic patterns of movement, resulting in large, but repetitive, COP excursions. A combination of linear and nonlinear measures may provide insight into the control of posture of young infants.

[Assessment of preterm children's early development]

Preterm birth is an event that affects the child's healthy development. Several studies have addressed the evaluation of children born preterm and the influence that multiple risk factors have on the course of their development. This study performed a systematic review of the literature from 2000 to 2005 about the evaluation of the development of children born preterm until the age of 24 months. The biological risk factors were present in every study, with highlights on intraventricular hemorrhage, necrotizing enterocolitis, chronic pulmonary disease, and retardation of intrauterine development as the most studied risks. The child's motor development was the most studied area. In terms of age, the first evaluations focused on the first six months of life. Neonatal risk, low birth weight, baby boys, cerebral injuries, and first-week abnormal spontaneous movements were predicting factors of preterm child development at the age of two years.

Predictive factors for neuromotor abnormalities at the corrected age of 12 months in very low birth weight premature infants

BACKGROUND: The increase in survival of premature newborns has sparked growing interest in the prediction of their long-term neurodevelopment. OBJECTIVE: To estimate the incidence of neuromotor abnormalities at the corrected age of 12 months and to identify the predictive factors associated with altered neuromotor development in very low birth weight premature infants. METHOD: Cohort study. The sample included 100 premature infants. The outcome was neuromotor development at 12 months classified by Bayley Scale (PDI) and neurological assessment (tonus, reflexes, posture). A multivariate logistic regression model was constructed. Neonatal variables and neuromotor abnormalities up to 6 months of corrected age were selected by bivariate analysis. RESULTS: Mean birth weight was 1126g (SD: 240). Abnormal neuromotor development was presented in 60 children at 12 months corrected age. CONCLUSION: According to the model, patients with a diagnosis including bronchopulmonary dysplasia, hypertonia of lower extremities, truncal hypotonia showed a 94.0% probability of neuromotor involvement at 12 months.

The quality of the early motor repertoire in preterm infants predicts minor neurologic dysfunction at school age

OBJECTIVE

The quality of a child's motor repertoire at age 3 to 4 months postterm is predictive of later cerebral palsy (CP). Its predictive power for minor neurologic dysfunction (MND) is unclear. This study aimed to investigate the predictive value of the quality of the early motor repertoire for the development of MND at school age.

STUDY DESIGN

We assessed the motor repertoire from video recordings made at 6 to 24 weeks postterm in 82 preterm infants (mean gestational age, 29.7 +/- 1.9 weeks; mean birth weight, 1183 +/- 302 g). At age 7 to 11 years, Touwen's neurologic examination was performed, and the children were classified as normal (n = 49; 60%), MND (n = 18; 22%), or CP (n = 15; 18%).

RESULTS

Multiple logistic regression analysis showed that the quality of fidgety movements (FMs) and the quality of the concurrent motor repertoire had independent prognostic value for MND at school age. Abnormal FMs evolved into MND in 64% of the children. Nine of the 28 children with normal FMs and an abnormal concurrent motor repertoire developed abnormally (32%). Only 1 child of the 21 children with normal FMs and a normal concurrent motor repertoire developed MND (5%).

CONCLUSIONS

Assessment of the quality of the early motor repertoire can accurately identify individual infants at high and low risk for MND at school age.

Movement training advances the emergence of reaching in infants born at less than 33 weeks of gestational age: a randomized clinical trial

BACKGROUND AND PURPOSE

This study had 2 purposes: (1) to compare the emergence of reaching in infants born full-term and infants born at less than 33 weeks of gestational age and (2) to evaluate the effectiveness of a movement training program on the emergence of reaching in this preterm population.

PARTICIPANTS

Twenty-six infants born at less than 33 weeks of gestational age and with a birth weight less than 2,500 g were randomly assigned to receive 20 minutes of daily movement training (PT-M group) or daily social training (PT-S group) and were compared with 13 infants born full-term (FT-S group).

METHODS

Reaching and hand-object interactions were tested every other week for 8 weeks. At each visit, infants were allowed six 30-second opportunities to contact a midline toy.

RESULTS

The FT-S and PT-M groups reached earlier and more consistently than the PT-S group. Specifically, the subjects in the FT-S group contacted the toy for longer durations and with an open, ventral surface of their hand. The PT-M group demonstrated increases in the number of hand-object contacts, the number of consistent reaches, and the percentage of time interacting with the toy and the surface of hand-object contact.

DISCUSSION AND CONCLUSION

This project demonstrates that there are early gross motor skill differences in infants born at less than 33 weeks of gestational age. A caregiver-based daily training program, however, is effective at lessening some, but not all, of these differences over the short term.

Muscle tendon unit comparisons between infants born preterm and infants born full term: a pilot study

PURPOSE

This study assessed differences in measures of the muscle tendon unit between infants born preterm and infants born full-term.

METHODS

Twenty infants born between 26 and 36 weeks of gestation comprised the preterm group and 21 infants born between 38 and 42 weeks of gestation comprised the full-term group. Gastrocnemius-soleus measurements were obtained with a taut tendon and relaxed muscle belly (Ao), and with a taut tendon and elongated muscle belly (Amax). Muscle extensibility measurements were obtained with a goniometer. Ao to Amax was the difference between Ao and Amax measurements.

RESULTS

Statistically significant differences were found for both measures of muscle extensibility, but not for the difference between these measures. The preterm group demonstrated measures of Ao and Amax in more extended ankle positions.

CONCLUSION

Muscle length differences are present between infants born full-term and infants born preterm. These differences are most likely due to differences in tendon length.

A randomised controlled trial comparing two temporising management strategies, one with and one without plasma volume expansion, for severe and early onset pre-eclampsia

OBJECTIVES

Plasma volume expansion may benefit both mother and child in the temporising management of severe and early onset hypertensive disorders of pregnancy.

DESIGN

Randomised clinical trial. Setting Two university hospitals in Amsterdam, The Netherlands.

POPULATION

Two hundred and sixteen patients with a gestational age between 24 and 34 completed weeks with severe pre-eclampsia, haemolysis, elevated liver enzymes and low platelets (HELLP) syndrome or severe fetal growth restriction (FGR) with pregnancy-induced hypertension, admitted between 1 April 2000 and 31 May 2003.

METHODS

One hundred and eleven patients were randomly allocated to the treatment group, (plasma volume expansion and a diastolic BP target of 85-95 mmHg) and 105 to the control group (intravenous fluid restriction and BP target of 95-105 mmHg).

MAIN OUTCOME MEASURES

Neonatal neurological development at term age (Prechtl score), perinatal death, neonatal morbidity and maternal morbidity.

RESULTS

Baseline characteristics were comparable between groups. The median gestational age was 30 weeks. In the treatment group, patients received higher amounts of intravenous fluids (median 813 mL/day vs 14 mL/day; P < 0.001) with a concomitant decreased haemoglobin count (median -0.6 vs-0.2 mmol/L; P < 0.001). Neither neurological scores nor composite neonatal morbidity differed. A trend towards less prolongation of pregnancy (median 7.4 vs 11.5 days; P= 0.054) and more infants requiring oxygen treatment >21% (66 vs 46; P= 0.09) in the treatment group was observed. There was no difference in major maternal morbidity (total 11%), but there were more caesarean sections in the treatment group (98%vs 90%; P < 0.05).

CONCLUSION

The addition of plasma volume expansion in temporising treatment does not improve maternal or fetal outcome in women with early preterm hypertensive complications of pregnancy.

Quality of reaching and postural control in young preterm infants is related to neuromotor outcome at 6 years

A substantial proportion of the "apparently normal" preterm infants exhibit minor and moderate dysfunctions in neuromotor outcome as they grow older. Birth characteristics, minor abnormalities on the neonatal ultrasound scan of the brain, and motor milestones have only limited value in the early detection of these children. The aim of the present study was to investigate whether nonoptimal reaching and relatively immobile postural behavior at an early age are associated with dysfunctional neuromotor and behavioural development at school age. The preterm children and full-term children of the present follow-up study participated in a previous study on the characteristics of reaching kinematics and the kinetics of posture at 4 and 6 mo corrected age. At the age of 6 y, the children were re-assessed by means of the Touwen neurologic assessment, the Movement ABC, and the Child Behavior Check List. The results demonstrated that in preterm children without cerebral palsy, a lack of successful reaching at 4 mo and a nonoptimal quality of reaching at 6 mo are related to the development of a complex form of minor neurologic dysfunction (MND) and fine manipulative disability at 6 y. Thus, these early signs indicate the presence of clinically significant brain dysfunction. A relatively immobile postural behavior at 4 mo was associated with simple MND, coordination problems, and at 6 mo with a worse score on the Movement ABC and internalizing behavior. This suggests that a relatively immobile postural behavior points to a mild form of brain dysfunction.

The effects of an early physical therapy intervention for very preterm, very low birth weight infants: a randomized controlled clinical trial

PURPOSE

A randomized controlled clinical trial was used to investigate effects of physical therapy (PT) intervention on motor outcome of infants born very preterm with very low birth weight (VLBW).

METHODS

Seventy-two infants born very preterm with VLBW were randomly assigned to a nontreatment (NT) (n = 38) or treatment (T) (n = 34) group. The T group received developmental PT from birth until four months corrected age (CA) weekdays during the infant's neonatal stay and on a needs- and problem-orientated basis thereafter. The NT group received no intervention. Both groups were assessed at four months CA using the Alberta Infant Motor Scale (AIMS) as was a control group of 14 infants born full term. Parental compliance was measured using a parent questionnaire.

RESULTS

PT intervention had no significant effect on the T group's motor performance. However, no T group subjects had abnormal motor development at four months CA when compared to the NT group (16%) and the control group (14%) (p = 0.09). The T group subjects with high levels of parental compliance had better scores on the AIMS than those with lower parental compliance (p = 0.05).

CONCLUSION

PT intervention does not significantly affect motor performance of infants born very preterm with VLBW at four months CA. Parental compliance and intervention frequency may have influenced the outcome. Preliminary evidence suggests that neonatal and early PT may reduce the incidence of motor delay among infants born very preterm with VLBW. Follow-up of this group is recommended to ascertain the long-term benefits of this type of early PT.

Vestibulospinal component of postural control (vestibular function) in very preterm infants (25 to 27 weeks) at 3, 6, and 12 months corrected age

Postural control, which is important for the development of all movement, balance, and locomotion, depends a great deal on the vestibulospinal component of vestibular function in early childhood. Vestibulospinal input is important for muscle power regulation, which, in turn, influences postural control. The aim of this study was to focus particularly on this component of vestibular function during the first year of life in 67 infants with a very short gestational age (25-27 weeks), to search for possible neonatal confounders, and to see whether it influences the course of muscle power development in preterm infants. Outcome was described as being optimal, suspect, or abnormal. The infants were categorized into the Neonatal Medical Index according to the severity of neonatal illness and separately into three groups for neonatal brain ultrasonography findings (normal to severe abnormalities). At the age of 3 months, 20 infants performed optimally on all items testing vestibular function, increasing to 40 at 6 months and 48 at 12 months. This significant improvement (also seen in muscle power regulation) was primarily caused by better head control (during the traction response and prone position), whereas less shoulder retraction and hyperextension were found in the sitting position. Vestibular function was significantly related to brain ultrasonography classification but not to gestational age, birthweight, the Neonatal Medical Index, or gender.