The development of trunk control and its relation to reaching in infancy: a longitudinal study

Frontiers in Human Neuroscience
Jaya RachwaniMarjorie H Woollacott

Abstract

The development of reaching is crucially dependent on the progressive control of the trunk, yet their interrelation has not been addressed in detail. Previous studies on seated reaching evaluated infants during fully supported or unsupported conditions; however, trunk control is progressively developed, starting from the cervical/thoracic followed by the lumbar/pelvic regions for the acquisition of independent sitting. Providing external trunk support at different levels to test the effects of controlling the upper and lower regions of the trunk on reaching provides insight into the mechanisms by which trunk control impacts reaching in infants. Ten healthy infants were recruited at 2.5 months of age and tested longitudinally, until 8 months. During the reaching test, infants were placed in an upright seated position and an adjustable support device provided trunk fixation at pelvic and thoracic levels. Kinematic and electromyographic data were collected. Results showed that prior to independent sitting, postural instability was higher when infants were provided with pelvic compared to thoracic support. Associated reaches were more circuitous, less smooth and less efficient. In response to the instability, there was increased po...Continue Reading

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Citations

Aug 11, 2015·Frontiers in Human Neuroscience·Jaya RachwaniMarjorie H Woollacott
Dec 25, 2016·Journal of Motor Behavior·Erika Shirley Moreira da SilvaEloisa Tudella
Oct 21, 2016·Physical Therapy·Carolina Souza Neves da CostaMarjorie H Woollacott
Oct 27, 2017·Developmental Psychobiology·Jaya RachwaniKaren E Adolph
Dec 30, 2017·Experimental Brain Research·Kerian DuncanSandra Saavedra
Oct 22, 2019·Journal of Motor Behavior·Ana Luiza Righetto GrecoEloisa Tudella
Mar 30, 2017·Journal of Motor Behavior·Victor SantamariaMarjorie Woollacott
Sep 19, 2021·Scientific Reports·Vedasri DasojuRavi Shankar Reddy

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