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Hand strength and prone extension in right-dominant, 6 to 9 year olds
Insights
Hand strength and prone extension duration in children aged 6-9 increase with age. Hand strength strongly correlates with height and weight, suggesting it may indicate normal development.
Area of Science:
- Pediatric physical development
- Motor control and development
- Biometrics in childhood
Background:
- Understanding typical developmental trajectories for physical attributes in children is crucial for identifying developmental deviations.
- Hand strength and postural control, such as prone extension, are key indicators of motor development in early childhood.
Purpose of the Study:
- To investigate the developmental trends of hand strength, and the quality and duration of prone extension in children aged 6 to 9 years.
- To examine the influence of age, sex, height, and weight on these developmental parameters.
- To establish the relationship between hand strength and prone extension abilities.
Main Methods:
- A stratified random sample of 153 right-dominant children (6-9 years) with normal or above intelligence was assessed.
- Hand strength was measured using the Jamar hand dynamometer.
- A novel scale was employed to rate the quality of prone extension, alongside duration measurements.
Main Results:
- Both right- and left-hand strength increased with age, with right-hand strength being significantly higher.
- Duration of prone extension increased with age, but its quality did not correlate with age.
- Height and weight showed strong positive correlations with hand strength and weaker correlations with prone extension duration.
Conclusions:
- Hand strength appears to be a reliable index of normal physical development in children aged 6-9.
- Children in this age group can achieve the prone extension position, though the significance of durations exceeding 30 seconds requires further investigation.
Abstract:
A stratified random sample of 153 right-dominant children (6 to 9 years of age) with normal or above intelligence was selected to study the development of hand strength, and the quality and duration of prone extension as a function of age, sex, height, and weight of the child. The Jamar hand dynamometer was used to measure hand strength, and a new scale for rating the quality of prone extension was presented. Both right- and left-hand strength increased monotonically with age, with the right being significantly higher than the left. Duration of prone extension increased monotonically with age, but quality of prone extension did not correlate with age. Sex differences were found only on the variable left-hand strength (males greater than females). Hand strength demonstrated weak correlation with duration of prone extension. Both height and weight exhibited strong positive correlations with hand strength, weaker positive correlations with duration of prone extension, and no correlation with quality of prone extension. The results suggest hand strength can be an index of normal development, and children ages 6 to 9 can attain the prone extension position; however, the meaning of duration greater than 30 seconds needs to be researched further.