Recording activity in proximal muscle networks with surface EMG in assessing infant motor development |
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| Affiliation: | 1. Baba Center, Children’s Hospital, Helsinki University Hospital and University of Helsinki, Helsinki, Finland;2. Department of Clinical Neurophysiology, HUS Medical Imaging Center, University of Helsinki, Helsinki University Hospital and University of Helsinki, Helsinki, Finland;3. Department of Design, Aalto University, Espoo, Finland;4. Neuroscience Center, University of Helsinki, Helsinki, Finland |
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| Abstract: | ![]()
ObjectiveTo develop methods for recording and analysing infant’s proximal muscle activations.MethodsSurface electromyography (sEMG) of truncal muscles was recorded in three months old infants (N = 18) during spontaneous movement and controlled postural changes. The infants were also divided into two groups according to motor performance. We developed an efficient method for removing dynamic cardiac artefacts to allow i) accurate estimation of individual muscle activations, as well as ii) quantitative characterization of muscle networks.ResultsThe automated removal of cardiac artefacts allowed quantitation of truncal muscle activity, which showed predictable effects during postural changes, and there were differences between high and low performing infants. The muscle networks showed consistent change in network density during spontaneous movements between supine and prone position. Moreover, activity correlations in individual pairs of back muscles linked to infant́s motor performance.ConclusionsThe hereby developed sEMG analysis methodology is feasible and may disclose differences between high and low performing infants. Analysis of the muscle networks may provide novel insight to central control of motility.SignificanceQuantitative analysis of infant’s muscle activity and muscle networks holds promise for an objective neurodevelopmental assessment of motor system. |
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| Keywords: | Surface electromyography Muscle networks Neurodevelopment Infants Cardiac artefact CC" },{" #name" :" keyword" ," $" :{" id" :" k0035" }," $$" :[{" #name" :" text" ," _" :" correlation coefficient the 95th percentile of surrogate correlation coefficient values ECG" },{" #name" :" keyword" ," $" :{" id" :" k0055" }," $$" :[{" #name" :" text" ," _" :" electrocardiogram EEG" },{" #name" :" keyword" ," $" :{" id" :" k0065" }," $$" :[{" #name" :" text" ," _" :" electroencephalography EMG" },{" #name" :" keyword" ," $" :{" id" :" k0075" }," $$" :[{" #name" :" text" ," _" :" electromyography E q." },{" #name" :" keyword" ," $" :{" id" :" k0085" }," $$" :[{" #name" :" text" ," _" :" Equation GM" },{" #name" :" keyword" ," $" :{" id" :" k0095" }," $$" :[{" #name" :" text" ," _" :" general movements ICA" },{" #name" :" keyword" ," $" :{" id" :" k0105" }," $$" :[{" #name" :" text" ," _" :" independent component analysis LAbd" },{" #name" :" keyword" ," $" :{" id" :" k0115" }," $$" :[{" #name" :" text" ," _" :" Left abdominal muscle (musculus rectus abdominis) LDel" },{" #name" :" keyword" ," $" :{" id" :" k0125" }," $$" :[{" #name" :" text" ," _" :" Left deltoid muscle LoBack" },{" #name" :" keyword" ," $" :{" id" :" k0135" }," $$" :[{" #name" :" text" ," _" :" lower back muscles (musculus erector spinae at L4-L5 paraspinal level) LPect" },{" #name" :" keyword" ," $" :{" id" :" k0145" }," $$" :[{" #name" :" text" ," _" :" Left pectoral muscle MAI" },{" #name" :" keyword" ," $" :{" id" :" k0155" }," $$" :[{" #name" :" text" ," _" :" muscle activation index Neck" },{" #name" :" keyword" ," $" :{" id" :" k0165" }," $$" :[{" #name" :" text" ," _" :" neck extensor muscles (musculus semispinalis capitis) Nedges" },{" #name" :" keyword" ," $" :{" id" :" k0175" }," $$" :[{" #name" :" text" ," _" :" the number of significant edges RAbd" },{" #name" :" keyword" ," $" :{" id" :" k0185" }," $$" :[{" #name" :" text" ," _" :" Right abdominal muscle (musculus rectus abdominis) RDel" },{" #name" :" keyword" ," $" :{" id" :" k0195" }," $$" :[{" #name" :" text" ," _" :" right deltoid muscle RPect" },{" #name" :" keyword" ," $" :{" id" :" k0205" }," $$" :[{" #name" :" text" ," _" :" Right pectoral muscle SCC" },{" #name" :" keyword" ," $" :{" id" :" k0215" }," $$" :[{" #name" :" text" ," _" :" surrogate correlation coefficient SD" },{" #name" :" keyword" ," $" :{" id" :" k0225" }," $$" :[{" #name" :" text" ," _" :" standard deviation sEMG" },{" #name" :" keyword" ," $" :{" id" :" k0235" }," $$" :[{" #name" :" text" ," _" :" surface electromyography SST" },{" #name" :" keyword" ," $" :{" id" :" k0245" }," $$" :[{" #name" :" text" ," _" :" surrogate signal test UpBack" },{" #name" :" keyword" ," $" :{" id" :" k0255" }," $$" :[{" #name" :" text" ," _" :" upper back muscles (musculus erector spinae at Th3-4 paraspinal level) Z-sum" },{" #name" :" keyword" ," $" :{" id" :" k0265" }," $$" :[{" #name" :" text" ," _" :" Z-score sum |
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