A Dynamical System Analysis of the Development of Spontaneous Lower Extremity Movements in Newborn and Young Infants
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概要
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This studys aim was to evaluate the characteristics of newborn and young infants spontaneous lower extremity movements by using dynamical systems analysis. Participants were 8 healthy full-term newborn infants (3 boys, 5 girls, mean birth weight and gestational age were 3070.6 g and 39 weeks). A tri-axial accelerometer measured limb movement acceleration in 3-dimensional space. Movement acceleration signals were recorded during 200 s from just below the ankle when the infant was in an active alert state and lying supine (sampling rate 200 Hz). Data were analyzed linearly and nonlinearly. As a result, the optimal embedding dimension showed more than 5 at all times. Time dependent changes started at 6 or 7, and over the next four months decreased to 5 and from 6 months old, increased. The maximal Lyapnov exponent was positive for all segments. The mutual information is at its greatest range at 0 months. Between 3 and 4 months the range in results is narrowest and lowest in value. The mean coefficient of correlation for the x-axis component was negative and y-axis component changed to a positive value between 1 month old and 4 months old. Nonlinear time series analysis suggested that newborn and young infants spontaneous lower extremity movements are characterized by a nonlinear chaotic dynamics with 5 to 7 embedding dimensions. Developmental changes of an optimal embedding dimension showed a U-shaped phenomenon. In addition, the maximal Lyapnov exponents were positive for all segments (0.79–2.99). Infants spontaneous movement involves chaotic dynamic systems that are capable of generating voluntary skill movements.
- 日本生理人類学会の論文
- 2011-09-30
著者
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FUJIWARA TAKAYUKI
Koriyama Institute of Health Sciences
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Ohgi Shohei
Department Of Rehabilitation Sciences Seirei Christopher University
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Ohgi Shohei
Department Of Preventive Medicine And Health Promotion Nagasaki University School Of Medicine
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Fujiwara Takayuki
School Of Allied Medical Science Shinshu University
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GIMA HIROTAKA
Koriyama Institute of Health Sciences
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KARASUNO HIROSHI
Koriyama Tohto Academy Educational Foundation Koriyama Institute of Health Sciences
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Morita Satoru
Department Of Systems Engineering Shizuoka University
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Morita Satoru
Department Of Cardiovascular Surgery National Hospital Organization Higashihiroshima Medical Center
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Gima Hirotaka
Department Of Rehabilitation Nagasaki University Hospital
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Karasuno Hiroshi
School Of Physical Therapy Koriyama Institute Of Health Sciences
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GIMA Hirotaka
School of Physical Therapy, Koriyama Institute of Health Sciences
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ABE Koji
Interdisciplinary Graduate School of Science and Technology, Shinshu University
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Gima Hirotaka
School Of Physical Therapy Koriyama Institute Of Health Sciences
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Abe Koji
Interdisciplinary Graduate School Of Science And Technology Shinshu University
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Fujiwara Takayuki
School Of Physical Therapy Koriyama Institute Of Health Sciences
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