BMI-referenced standards for recommended pedometer-determined steps/day in children

Area of Science:

• Pediatric Exercise Science
• Childhood Obesity Research
• Public Health Nutrition

Background:

• Physical activity (PA) recommendations for youth should align with health outcomes.
• Previous PA standards lacked direct links to healthy body composition.
• Objective measurement of PA and body composition is essential for setting evidence-based guidelines.

Purpose of the Study:

• To establish criterion-referenced physical activity (PA) standards using pedometer-assessed steps/day.
• To determine PA cut points associated with healthy body composition in children aged 6-12 years.
• To differentiate between norm-referenced and criterion-referenced PA standards.

Main Methods:

• Secondary analysis of a dataset including 1,954 children (ages 6-12) from the USA, Australia, and Sweden.
• Utilized the contrasting groups method to establish criterion-referenced cut points for steps/day.
• Linked pedometer-assessed PA data with objectively measured Body Mass Index (BMI) using international cut points for normal weight and overweight/obesity.

Main Results:

• Established age- and sex-specific criterion-referenced standards for daily steps.
• Recommended cut points were 12,000 steps/day for girls and 15,000 steps/day for boys (ages 6-12).
• These criterion-referenced standards are higher than previously suggested normative values.

Conclusions:

• Criterion-referenced standards based on BMI categories offer a more health-relevant approach than traditional norm-referenced standards.
• The established steps/day cut points provide a foundation for future research and public health recommendations.
• Further validation in independent samples and longitudinal studies is needed to confirm these findings.