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Rhythmical leg movements in low-risk and brain-damaged preterm infants
1U.F.R. de Psychologie, Sciences Sociales et Sciences de l'Education, Université Blaise-Pascal, Clermont-Ferrand, France.
Insights
Rhythmical kicking movements in preterm infants with brain damage (BD) showed subtle differences in coordination and timing compared to low-risk (LR) infants at 37-39 weeks postmenstrual age. General movement assessment, not quantitative kicking analysis, better correlated with brain lesions and motor outcomes.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Movement Science
Background:
- Preterm infants with brain damage (BD) often exhibit motor impairments.
- Early identification of motor deficits is crucial for timely intervention.
- Rhythmical kicking movements are a key indicator of early motor development.
Purpose of the Study:
- To characterize and compare rhythmical kicking movements in preterm infants with and without brain damage.
- To investigate the relationship between kicking characteristics and neurological outcomes.
- To evaluate the clinical utility of quantitative vs. qualitative movement analysis.
Main Methods:
- Spontaneous movements of 12 brain-damaged (BD) and 12 low-risk (LR) preterm infants were videotaped.
- Infants were assessed at two age groups: 31-35 weeks and 37-39 weeks postmenstrual age (PMA).
- Quantitative analysis of kicking bouts (frequency, inter-leg coordination, temporal organization) and Gestalt evaluation of general movements were performed.
Main Results:
- No significant differences in kicking characteristics were found between BD and LR infants at 31-35 weeks PMA.
- At 37-39 weeks PMA, differences emerged in inter-leg coordination and temporal organization, not frequency.
- LR infants showed more alternate-leg movements and fewer semi-both-leg movements than BD infants.
- Quantitative kicking analysis showed large overlaps between groups, limiting clinical utility.
- Gestalt evaluation of general movements correlated better with brain lesions and neurological outcome.
Conclusions:
- Quantitative analysis of rhythmical kicking is not sufficiently sensitive to differentiate brain-damaged from low-risk preterm infants at term-equivalent age.
- Qualitative assessment (Gestalt evaluation) of general movements is a more promising tool for identifying neurological impairment in preterm infants.
- Further research should focus on refining qualitative movement assessment for early detection of motor deficits.
Abstract:
The characteristics of rhythmical kicking movements of preterm infants with documented brain damage (BD), who later showed a severe motor impairment, are described and compared with those of low-risk (LR) preterm infants. Spontaneous movements were videotaped for 60 min in the incubator or in a warmer. A first group of 6 BD and 6 LR infants was observed at 31-35 weeks of postmenstrual age (PMA) and a second group (6 BD, 6 LR) at 37-39 weeks. Bouts of rhythmical kicks, defined as leg movements repeated in the same form at least three times at regular short intervals, were analysed during periods of activity. The results indicated non-significant differences between BD and LR infants at 31-35 weeks of PMA. In contrast, some differences were observed at 37-39 weeks. These differences were not due to leg movement frequency, but to inter-leg coordination and to temporal organisation of the kicking cycles. LR infants exhibited more alternate-leg movements and fewer semi-both-leg movements (simultaneous flexion and non-simultaneous extension) than BD infants. In LR cases the duration of the pause between flexion and extension was shorter, whereas flexion and extension periods were similar for all infants. Although there were significant differences, quantitative analysis of kicking characteristics was not clinically useful because of the large overlap in findings between the two groups. On the other hand Gestalt evaluation of general movements of the same videorecordings showed a closer correlation with the presence of brain lesions and with neurological outcome.