Evaluation of Sedentary Behavior and Physical Activity Levels Using Different Accelerometry Protocols in Children...

Area of Science:

• Pediatric Health
• Biomedical Engineering
• Exercise Science

Background:

• Physical activity (PA) is vital for health, but accelerometer data interpretation is challenging due to varied intensity cut-off points.
• Accelerometers are effective tools for PA assessment, yet inconsistent protocols hinder cross-study comparisons.

Purpose of the Study:

• To compare sedentary behavior (SB) and PA levels in children using six distinct accelerometry protocols.
• To highlight the impact of diverse cut-off points on PA intensity classification in pediatric populations.

Main Methods:

• Evaluated 543 children (aged 10 ± 2.4 years) from the Spanish GENOBOX study.
• Utilized accelerometry with six validated protocols featuring different cut-off points to measure SB and PA intensity.
• Assessed clinical, anthropometric, and PA data, accounting for non-wear time, puberty, age, and BMI.

Main Results:

• Significant variations in SB and PA intensity estimations were observed across the six protocols.
• Daily SB duration ranged widely from 471 to 663.7 minutes.
• Total PA varied from 141 to 301.6 minutes, with moderate-to-vigorous PA (MVPA) ranging from 20.7 to 180.2 minutes.

Conclusions:

• The selection of an accelerometry protocol significantly influences SB and PA intensity findings in children.
• Standardized and validated accelerometry methodologies are essential for future research on pediatric SB and PA.
• Further research should explore diverse analytical approaches for robust SB and PA measurement.