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How Many Days are Necessary to Represent Typical Daily Leg Movement Behavior for Infants at Risk of Developmental

Weiyang Deng1, Ryota Nishiyori2, Douglas L Vanderbilt3

  • 1Division of Biokinesiology and Physical Therapy, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA 90033, USA.

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|September 23, 2020
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Summary

Two days of wearable sensor data effectively capture typical movement in at-risk infants, minimizing participant burden. Daily leg movement patterns showed no significant difference between weekdays and weekend days.

Keywords:
at riskdevelopmental disabilitiesinfantminimum wear timewearable sensor

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Area of Science:

  • Developmental pediatrics
  • Wearable sensor technology
  • Infant movement analysis

Background:

  • Movement characteristics differentiate infants at risk for developmental disabilities from those typically developing.
  • Optimal data collection duration for at-risk infants using wearable sensors remains unclear.
  • Balancing participant burden and data quantity is crucial for efficient data collection.

Purpose of the Study:

  • Determine the number of days needed to represent typical movement behavior in at-risk infants.
  • Investigate differences in movement behavior between weekend days and weekdays.

Main Methods:

  • Collected leg movement data from 11 infants using Opal wearable sensors for at least 5 days.
  • Compared 1-4 days of data to a 5-day standard using Bland-Altman plots and Spearman correlation.
  • Analyzed differences in movement data between weekend days and weekdays for 8 infants.

Main Results:

  • Spearman correlation coefficients above 0.7 and <10% absolute differences indicate 2 days of data represent the standard.
  • Bland-Altman plots showed >90% of data points within limits of agreement for 2-day averages.
  • Minimal differences (<15.2%) observed in leg movement rate, duration, and acceleration between weekend and weekdays.

Conclusions:

  • Two days of data collection is optimal for representing typical leg movement behavior in at-risk infants, balancing data accuracy and participant burden.
  • No distinct differences in leg movement behavior were found between weekend days and weekdays.
  • Findings support efficient data collection strategies for evaluating infant movement using wearable sensors.