IMU Step Detection
Detect heel-strikes from a vertical-axis accelerometer signal, then read off cadence, step time, gait symmetry, and step length.
Load data
📊 Sample accelerometry
Vertical axis acceleration recommended. Positive = upward for heel-strike detection.
Filter
Removes high-frequency noise while preserving heel-strike peaks. Typical: 15-25 Hz.
Peak detection
Fraction of dynamic range above baseline. Higher = stricter. Recommended: 30-50%.
Prevents double-detection. Typical walking: 400-600 ms. Running: 200-350 ms.
Step length estimation
Greater trochanter to floor. Used in Grieve & Gear (1966) model.
Status
Load a file to begin.
References
Step length estimation: Grieve, D.W., & Gear, R.J. (1966). The relationships between length of stride, step frequency, time of swing and speed of walking for children and adults. Ergonomics, 9(5), 379-399.
Symmetry index: Robinson, R.O., Herzog, W., & Nigg, B.M. (1987). Use of force platform variables to quantify the effects of chiropractic manipulation on gait symmetry. Journal of Manipulative and Physiological Therapeutics, 10(4), 172-176.
IMU gait analysis: Tao, W., Liu, T., Zheng, R., & Feng, H. (2012). Gait analysis using wearable sensors. Sensors, 12(2), 2255-2283.