Figure 2From: Using hierarchical clustering methods to classify motor activities of COPD patients from wearable sensor dataAccelerometer data samples. Accelerometer signals are shown over a window of 5s corresponding to a few cycles of the following motor tasks: level walking, cycling, walking up an incline, and walking up stairs. Data are shown for the accelerometers positioned on left and right thigh with axes oriented in the antero-posterior and up and down directions.Back to article page