Figure 9

Instances of failure occurring with the proposed algorithm (subject: A1 after 2 hours of exercise). Here, ‘red asterisk’ represents the detected a wave and ‘black plus sign’ represents the detected b wave by the proposed algorithm. The purple pentagon represents a false negative for the a wave, while purple circle represents the false negative for the b wave. The green square represents the false positive of the b wave, which was the only false positive inccurred by the proposed b detection algorithm in the testing dataset.