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Protocol for Objective Measurement of Infants' Physical Activity using Accelerometry.

Luiza Isnardi Cardoso Ricardo1, Inácio Crochemore Mohnsam DA Silva, Rafaela Costa Martins

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Summary

For infants, accelerometry for physical activity measurement requires 2 days on the wrist or 3 days on the ankle. Wrist placement is more acceptable to infants and mothers.

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Area of Science:

  • Pediatrics
  • Biomedical Engineering
  • Physical Activity Measurement

Background:

  • Accurate measurement of physical activity in infants is crucial for understanding development and health.
  • Accelerometry is a common method, but optimal protocols for infants are not well-established.
  • Device placement and duration of measurement impact data reliability.

Purpose of the Study:

  • To determine the minimum number of measurement days for reliable infant physical activity assessment using accelerometry.
  • To compare the reliability and acceptability of wrist versus ankle accelerometer placement.
  • To evaluate accelerometry methods for infants' physical activity measurement.

Main Methods:

  • A cross-sectional mixed-methods study involving 90 infants.
  • Physical activity measured using Actigraph GT3X+ accelerometers on the wrist and/or ankle for 7 days.
  • Intraclass correlation coefficient (ICC) and Bland-Altman analysis to determine minimum measurement days.
  • Qualitative interviews assessed device acceptability.

Main Results:

  • For infants capable of walking, 2 days of wrist measurement or 3 days of ankle measurement achieved an ICC of 0.80.
  • Infants not yet walking required only 1 day of measurement for similar reliability.
  • Wrist placement was reported as more acceptable by infants and mothers.

Conclusions:

  • Two days of wrist accelerometry or three days of ankle accelerometry are sufficient for reliable physical activity measurement in infants who can walk.
  • Wrist placement offers better infant and maternal acceptability.
  • These findings provide practical guidelines for optimizing accelerometry protocols in infant research.