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Stressing the accuracy: Wrist-worn wearable sensor validation over different conditions.

Luca Menghini1, Evelyn Gianfranchi1, Nicola Cellini1

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Summary

The E4 wristband shows good accuracy for heart rate (HR) but less for heart rate variability (HRV) during dynamic stress. Skin conductance (SC) measurements from the wristband lack correlation with gold standards.

Keywords:
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Area of Science:

  • Psychophysiology
  • Wearable sensor technology
  • Biomedical engineering

Background:

  • Wearable sensors offer potential for psychophysiological research, but their measurement error requires careful consideration.
  • Understanding the accuracy of research-grade wearable sensors is crucial for reliable data collection in laboratory and ambulatory settings.

Purpose of the Study:

  • To evaluate the accuracy of the E4 wristband for measuring heart rate (HR), heart rate variability (HRV), and skin conductance (SC).
  • To assess sensor performance across five laboratory stress conditions and two ecological conditions.

Main Methods:

  • Forty healthy participants concurrently used the E4 wristband and gold standard measurement systems (electrocardiography, finger SC sensor).
  • Accuracy was assessed using signal quality evaluation, correlation analysis, and Bland-Altman plots against gold standard data.
  • Exploratory analyses identified predictors of measurement error.

Main Results:

  • The E4 wristband demonstrated the highest accuracy for mean HR across all tested conditions.
  • HRV accuracy was satisfactory during rest and recovery but reduced during dynamic tasks like speaking.
  • Wrist-based skin conductance (SC) showed no correlation or visual similarity with finger-based SC, suggesting different physiological reflections.

Conclusions:

  • The E4 wristband is accurate for HR measurement but has limitations for HRV during dynamic stress.
  • Wrist movements, stress, nonstationarity, and wrist circumference impact measurement accuracy.
  • Wrist SC measurements may not be interchangeable with finger SC, necessitating further research into SC responsivity.