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A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
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Visual Inspection for Determining Days When Accelerometer Is Worn: Is This Valid?

Eric J Shiroma1, Masamitsu Kamada, Colby Smith

  • 11Division of Preventive Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; 2National Institute on Aging, National Institutes of Health, Bethesda, MD; and 3Department of Health Promotion and Exercise, National Institute of Health and Nutrition, Shinjuku-ku, Tokyo, JAPAN.

Medicine and Science in Sports and Exercise
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Summary
This summary is machine-generated.

Visual inspection of accelerometer data is a valid method for determining wear days in mail studies, offering an alternative when participant logs are incomplete. This approach ensures accurate data collection for accelerometer studies.

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Area of Science:

  • Physical activity monitoring
  • Biomedical data analysis

Background:

  • Participant logs are traditionally used to determine accelerometer wear days in mail study designs.
  • Incomplete participant logs can compromise data accuracy in accelerometer research.

Purpose of the Study:

  • To evaluate the validity of visual inspection of accelerometer data as an alternative to participant logs for ascertaining wear days.
  • To assess the reliability of visual inspection when participant logs are missing in mail-based studies.

Main Methods:

  • Compared visual inspection of accelerometer output with participant logs in 197 women (mean age, 71.0 yr).
  • Two independent raters, masked to log status, analyzed daily accelerometer count graphs to determine wear days.
  • Calculated sensitivity, specificity, and interrater agreement for visual inspection.

Main Results:

  • Visual inspection demonstrated high accuracy, with sensitivity at 99.7% and specificity around 97.0-97.2% for both raters.
  • Interrater agreement for visual inspection was excellent at 99.5%.
  • The median number of valid wear days determined by both methods was consistently 7 (7-7).

Conclusions:

  • Visual inspection of accelerometer data is a valid and reliable method for determining wear days.
  • This technique serves as a viable alternative to supplement or replace missing participant logs in mail study designs.
  • The findings support the use of visual inspection to enhance data completeness and accuracy in accelerometer research.