Description of the Physical Activity of Young Children Using Movement Sensor and Observation Methods

Area of Science:

• Pediatric obesity
• Physical activity measurement
• Child development

Background:

• Childhood obesity is a growing public health concern.
• Accurate measurement of physical activity is crucial for understanding and intervening in childhood obesity.
• Existing physical activity measurement tools may have limitations in young children.

Purpose of the Study:

• To validate the Caltrac motion sensor for measuring physical activity in preschool children.
• To describe changes in physical activity levels over time in preschool children from obese and nonobese families.

Main Methods:

• Forty-seven preschool children wore Caltrac motion sensors and were videotaped in controlled settings and at home.
• Physical activity was measured using the Caltrac sensor and an observational method.
• Data were collected over two years.

Main Results:

• Caltrac readings showed a strong correlation with observational measures of physical activity in both years (r = .86 and r = .83).
• Outdoor play was associated with higher Caltrac scores (r = .43).
• Physical activity significantly decreased from Year 1 to Year 2 among young girls with obese parents.

Conclusions:

• The Caltrac motion sensor is a valid tool for assessing physical activity in young children.
• Physical activity patterns may differ based on parental weight status and sex.
• Interventions may be needed to address declining physical activity in at-risk groups, such as girls with obese parents.