Loss of Pulse

Code and data for the paper “Smartwatch-Based Detection of Loss of Pulse”.

The repository

Detect loss of pulse from smartwatch signals:

• PPG
• IMU Ground truth comes from Doppler ultrasound.

Labels used in the paper:

• pulse_loss
• wearing_normal
• not_worn

Data

The dataset is hosted on Polybox (ETH Zurich) for secure access:
Download from Polybox

Data collection setup

A typical sample should include:

• PPG
• accelerometer
• label (pulse_loss / wearing_normal / not_worn)

Preprocessing

• PPG bandpass: 0.5–25 Hz (Butterworth)
• resample to 100 Hz
• windowing: 8 s windows, 2 s stride
• IMU segmented with the same windows

Run

Install:

python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt