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Updated: Feb 12, 2026

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Tracking Steps on Apple Watch at Different Walking Speeds.

Praveen Veerabhadrappa1, Matthew Duffy Moran2, Mitchell D Renninger2

  • 1Kinesiology, Division of Science, The Pennsylvania State University, Reading, PA, USA. pmv5057@psu.edu.

Journal of General Internal Medicine
|April 11, 2018
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Summary

The Apple Watch demonstrates high accuracy in step counting, with a minimal error rate of 0.034% compared to video recordings. This validation confirms its reliability for tracking daily steps in adults.

Keywords:
Apple watchstep countstracking

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Area of Science:

  • Wearable technology
  • Biomedical engineering
  • Health informatics

Background:

  • Wearable devices like the Apple Watch are increasingly used for health monitoring.
  • Objective validation of step count accuracy from consumer wearables is crucial for reliable health data.
  • Previous studies have shown varying accuracy in different wearable devices.

Discussion:

  • This study objectively validated the accuracy of Apple Watch step counts against manual video recordings.
  • The Apple Watch exhibited a strong correlation (r=0.96) and minimal error (0.034%) in step measurement.
  • Accuracy was assessed across different walking speeds, providing comprehensive validation.

Key Insights:

  • Apple Watch step counts are highly accurate for adults, with a mean difference of only 1.07 steps compared to video analysis.
  • The device demonstrated excellent agreement with a concordance correlation coefficient of 0.96.
  • This research provides robust evidence supporting the use of Apple Watch for daily step tracking.

Outlook:

  • Further research could explore accuracy across diverse populations and activity types.
  • Long-term accuracy studies will be valuable as wearable technology evolves.
  • Integration of validated wearable data into clinical practice holds significant potential for remote patient monitoring.