title: Maturational and situational determinants of reaching at its onset.
abstract: At 3 months of age, reaching behavior was measured in a group of 10 girls and 10 boys born at term. The assessments were carried out on the average 2 days after reaching onset. Reaching kinematics was measured in both supine and reclined positions. Girls reached more than boys, had straighter reaching trajectories and movements of shorter durations as well as fewer movement units. The reclined position gave rise to straighter trajectories in both girls and boys. Several anthropometric parameters were measured. Girls had less length and volume of the forearm than boys but similar upper arm volumes. There was a weak relation between kinematic and anthropometric variables.
authors: Department of Physical Therapy, Neuropediatrics Section, Federal University of São Carlos, 13565-905 São Carlos, SP, Brazil. Electronic address: andreabaraldi@gmail.com.
authors: Andréa Baraldi
authors: AB
authors: Cunha
authors: Physical Therapy, Center of Biological and Health Sciences, Federal University of Mato Grosso do Sul, Postal Box 549, 79070900 Campo Grande, MS, Brazil.
authors: Daniele de Almeida
authors: Dde A
authors: Soares
authors: Department of Health Sciences, Federal University of São Paulo, 11015-020 Santos, SP, Brazil.
authors: Raquel de Paula
authors: Rde P
authors: Carvalho
authors: Department of Psychology, Uppsala University, Box 1225, SE-75142 Uppsala, Sweden.
authors: Kerstin
authors: K
authors: Rosander
authors: Department of Psychology, Uppsala University, Box 1225, SE-75142 Uppsala, Sweden.
authors: Claes
authors: C
authors: von Hofsten
authors: Department of Physical Therapy, Neuropediatrics Section, Federal University of São Carlos, 13565-905 São Carlos, SP, Brazil.
authors: Eloisa
authors: E
authors: Tudella
mesh_terms: D000375:Aging / Q000523:psychology*; D000886:Anthropometry; D001132:Arm; D001288:Attention / Q000502:physiology; D001696:Biomechanical Phenomena; D002657:Child Development / Q000502:physiology*; D003430:Cross-Sectional Studies; D005260:Female; D005542:Forearm / Q000033:anatomy & histology; D006801:Humans; D007223:Infant; D008297:Male; D009068:Movement; D011597:Psychomotor Performance / Q000502:physiology*; D012727:Sex Characteristics; D013028:Space Perception / Q000502:physiology; D016683:Supine Position
keywords: Gender; Infant; Motor development; Reaching