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(a) Illustration of wearable signals (ECG, SCG and AP) with corresponding VO2 from COSMED K5 system at different exercise intensity level for both (left) treadmill exercise and (right) outside walking exercise. (b) Ensemble averaged heartbeats of SCGDV signal at different exercise intensity levels during treadmill exercise. (c) Ensemble averaged heartbeats of SCGDV signal at different exercise intensity levels during outside walking exercise.
