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A Bluetooth-Enabled Device for Real-Time Detection of Sitting, Standing, and Walking: Cross-Sectional Validation
Reza Daryabeygi-Khotbehsara1, Jonathan C Rawstorn1, David W Dunstan2
1Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Melbourne Burwood, Australia.
JMIR Formative Research
|January 24, 2024
Summary
The Sedentary behaviOR Detector (SORD) accurately identifies sitting, standing, and walking behaviors. This Bluetooth device shows high precision and is a promising tool for promoting physical activity and reducing sedentary time.
Area of Science:
- Biomedical Engineering
- Physical Activity Measurement
- Wearable Technology
Background:
- Assessing sedentary behavior is crucial for public health.
- Accurate activity trackers are needed to monitor physical activity levels.
- The Sedentary behaviOR Detector (SORD) is a novel Bluetooth-enabled prototype.
Purpose of the Study:
- To evaluate the accuracy of the SORD device.
- To determine the criterion and convergent validity of SORD.
- To compare SORD's performance against direct observation and the activPAL device.
Main Methods:
- 15 healthy adults participated in the study.
- Participants wore SORD and activPAL devices on their thighs.
- Direct observation using cameras and Python algorithms were employed for data analysis.
Main Results:
- One SORD model demonstrated high precision and low bias.
- Accuracy, sensitivity, and specificity exceeded 0.95 for multiple behaviors.
- Bland-Altman analysis showed good agreement with direct observation, with some bias noted compared to activPAL.
Conclusions:
- SORD is a valid and accurate device for detecting sitting, standing, and walking.
- The device shows potential for use in interventions aimed at increasing physical activity.
- SORD can aid in reducing sedentary behavior through real-time feedback and adaptive strategies.
