H-Reflex Interactive Demo
This demo uses a synthetic dataset that mirrors real H-reflex EMG recruitment curves — the same signal processing used in the full app (Butterworth bandpass filter, RMS and peak-to-trough amplitude extraction). Use the controls to step through recordings at increasing stimulus intensities, or click any point on the recruitment curve to jump to that sweep.
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About this data
The H-reflex is a spinal monosynaptic reflex used to assess the excitability of the motor neuron pool. As stimulus intensity increases from threshold, two distinct responses emerge in the EMG:
- M-wave — direct motor response (~5–11 ms post-stimulus). Amplitude follows a sigmoid: sub-threshold, then rapid recruitment, then saturation (M-max). The blue shaded region marks the analysis window.
- H-wave — H-reflex response via spinal cord (~24–32 ms post-stimulus). Amplitude follows an inverted-U: peaks around 3–5 mA, then disappears as antidromic M-wave collision blocks it at high intensities. The green shaded region marks the analysis window.
- Stimulus onset — the electrical pulse delivered at 5 ms, marked by the dashed red line. A brief artifact is visible immediately after.
Synthetic data generated using physiologically calibrated parameters; filtered with a 4th-order Butterworth bandpass (100–3500 Hz). 35 sweeps, 1200 samples each at 30 kHz.