Development of postural adjustments during reaching in sitting children

We evaluated the development of postural adjustments accompanying reaching movements in sitting children. Twenty-nine typically developing children aged, 2–11 years, and ten adults were studied with multiple surface electromyograms (EMGs) and kinematics during reaching in four conditions: sitting with the seat-surface oriented horizontally with and without an additional task load, and sitting with the seat-surface tilted 15° forward and 15° backward. The development of postural adjustments during reaching in a sitting position turned out to have a non-linear and protracted course, which is not finished by the age of 11 years. The development of these adjustments is characterised by variation, yet specific developmental sequences could be distinguished. Firstly, the development of postural adjustments during reaching from the age of 2 years onwards lacked a preference for an en bloc strategy, which consists of an in concert activation of the direction-specific neck and trunk muscles. Secondly, anticipatory postural muscle activity, which was consistently present in adults, was virtually absent between 2 and 11 years of age. Thirdly, the data demonstrated that with increasing age the head gradually becomes the dominant frame of reference. In addition, the study suggested that, in terms of postural control, the forward-tilted position is the most efficient one.

[1]  M. E. Anderson,et al.  The effects of movement velocity, mass displaced, and task certainty on associated postural adjustments made by normal and hemiplegic individuals. , 1984, Journal of neurology, neurosurgery, and psychiatry.

[2]  C. Schmitz,et al.  Building anticipatory postural adjustment during childhood: a kinematic and electromyographic analysis of unloading in children from 4 to 8 years of age , 2002, Experimental Brain Research.

[3]  L. Wendt,et al.  IMPROVEMENT OF FUNCTIONAL SITTING POSITION FOR CHILDREN WITH CEREBRAL PALSY , 1991, Developmental medicine and child neurology.

[4]  H. Forssberg,et al.  Ontogenetic development of postural control in man: adaptation to altered support and visual conditions during stance , 1982, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[5]  M. Hadders‐Algra,et al.  Postural adjustments accompanying fast pointing movements in standing, sitting and lying adults , 1998, Experimental Brain Research.

[6]  K C Hayes,et al.  Anticipatory postural control in children. , 1990, Journal of motor behavior.

[7]  W. Gerver.  Measurement of the body proportions in children (the Oosterwolde study) , 1988 .

[8]  M. Woollacott,et al.  The growth of stability: postural control from a development perspective. , 1985, Journal of motor behavior.

[9]  A. Berthoz,et al.  Head stabilization during various locomotor tasks in humans , 2004, Experimental Brain Research.

[10]  H. Forssberg,et al.  Ontogeny of postural adjustments during sitting in infancy: variation, selection and modulation. , 1996, The Journal of physiology.

[11]  C. Assaiante,et al.  Development of Postural Adjustment During Gait Initiation: Kinematic and EMG Analysis , 2000, Journal of motor behavior.

[12]  A. Berthoz,et al.  Head and trunk movements in the frontal plane during complex dynamic equilibrium tasks in humans , 2004, Experimental Brain Research.

[13]  H. Diener,et al.  DEVELOPMENT OFFEEDBACK AND FEEDFORWARD CONTROL OF UPRIGHT STANCE , 1989, Developmental medicine and child neurology.

[14]  D. Brunt,et al.  Investigation of evidence for anticipatory postural adjustments in seated subjects who performed a reaching task. , 1992, Physical therapy.

[15]  C. Redon,et al.  Feedforward versus feedback control in children and adults subjected to a postural disturbance , 1999, Experimental Brain Research.

[16]  H. Forssberg,et al.  Postural adjustments during sitting at preschool age: presence of a transient toddling phase , 1998, Developmental medicine and child neurology.

[17]  Christine Assaiante,et al.  Development of Locomotor Balance Control in Healthy Children , 1998, Neuroscience & Biobehavioral Reviews.

[18]  M. Hadders‐Algra,et al.  The development of postural adjustments during reaching in 6- to 18-month-old infants Evidence for two transitions , 1999, Experimental Brain Research.

[19]  V. Dietz,et al.  Developmental aspects of equilibrium control during stance: a kinematic and EMG study , 1995 .

[20]  Janet L. Starkes,et al.  Velocity of centre of pressure excursions as an indicator of postural control systems in children , 1994 .

[21]  M. Hadders‐Algra,et al.  Postural adjustments during spontaneous and goal-directed arm movements in the first half year of life , 1999, Behavioural Brain Research.

[22]  H. Forssberg,et al.  Postural adjustments in sitting humans following external perturbations: muscle activity and kinematics , 2004, Experimental Brain Research.

[23]  Morris Milner,et al.  EFFECTS OF SEAT-SURFACE INCLINATION ON POSTURAL STABILITY AND FUNCTION OF THE UPPER EXTREMITIES OF CHILDREN WITH CEREBRAL PALSY , 1992 .

[24]  B. Amblard,et al.  Ontogenesis of head stabilization in space during locomotion in children: influence of visual cues , 2004, Experimental Brain Research.

[25]  J. Massion,et al.  Acquisition of anticipatory postural adjustments in a bimanual load-lifting task: normal and pathological aspects , 1999, Experimental Brain Research.

[26]  M L Latash,et al.  Anticipatory postural adjustments in conditions of postural instability. , 1998, Electroencephalography and clinical neurophysiology.

[27]  M. Latash,et al.  Anticipatory postural adjustments during self-paced and reaction-time movements , 1998, Experimental Brain Research.

[28]  M. Woollacott,et al.  Neuromuscular control of posture in the infant and child: is vision dominant? , 1987, Journal of motor behavior.

[29]  J. Starkes,et al.  Non-linear development of postural control and strategy use in young children: a longitudinal study , 2001, Experimental Brain Research.