2024 Volume 22 Issue 2 Pages 61-68
A questionnaire survey was conducted to investigate the appearance rate and onset age of repetitive knee flexion-extension movement in supported standing, and the relationship between this movement and major gross motor developments. Participants were 108 parents of infants aged 6-34 months enrolled in classes for 0-2-year-olds at nurseries. Participants answered the following questions about their child: frequency and onset age of repetitive knee flexion-extension movement, and onset age of major gross motor activities (independent sitting, crawling, creeping, pulling to stand, cruising, independent standing, and independent walking). Approximately 90% of participants answered that they had observed their children performing repetitive knee flexion-extension movement. The onset age was around 9.5 months, and all infants began this movement between the onset of “pulling to stand” and “independent walking”. Furthermore, a significant positive correlation was observed between the onset age of knee flexion-extension movement and the onset age of “independent walking” (r = 0.66, p < 0.01). These findings suggest that the knee flexion-extension movement is a movement typically observed in infancy and that it is related to “independent walking”.
