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Minimum Accelerometer Wear Time in Infants: A Generalizability Study.

E Andrew Pitchford, Leah R Ketcheson, Hyun-Jin Kwon

    Journal of Physical Activity & Health
    |March 15, 2017
    PubMed
    Summary
    This summary is machine-generated.

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    Reliable infant physical activity measurement requires at least 3 days of accelerometer data, capturing all daytime hours. This provides crucial guidelines for early intervention efforts to manage rapid weight gain in babies.

    Area of Science:

    • Pediatrics
    • Biomedical Engineering
    • Public Health

    Background:

    • Infant physical activity research is vital for early intervention strategies targeting rapid weight gain.
    • Limited evidence exists on infant physical activity patterns and measurement procedures.
    • Objective measurement of physical activity in infants is challenging.

    Purpose of the Study:

    • To determine the minimal duration of accelerometry needed for reliable measurement of infant physical activity.
    • To establish evidence-based guidelines for objective physical activity assessment in infants.
    • To utilize Generalizability (G) theory to validate measurement protocols.

    Main Methods:

    • 23 infants (14 female, 9 male) wore accelerometers on the ankle and wrist for 7 days.
    Keywords:
    accelerometryinstrument psychometricsmeasurementphysical activity

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  • Data underwent manual cleaning to exclude non-infant activity counts.
  • Generalizability (G) theory analyses were applied to average counts per epoch.

    • Main Results:

    • Reliable estimates were achieved with a minimum of 2 days and 12 hours of ankle accelerometry (G & Φ = .910).
    • Reliable estimates were achieved with a minimum of 3 days and 15 hours of wrist accelerometry (G & Φ = .906).
    • Specific G theory coefficients (G, Φ) indicate robust reliability at these durations.

    Conclusions:

    • This study offers foundational guidelines for objective physical activity measurement in infants.
    • Accelerometer monitoring for at least 3 days, encompassing all daytime hours, is recommended for reliable infant physical activity assessment.
    • These findings support the evaluation of early intervention programs aimed at preventing excessive weight gain in infants.