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. 2013 Aug 8;1:2700208. doi: 10.1109/JTEHM.2013.2277870

Fig. 7.

Fig. 7.

Breathing cycle durations were calculated by three different methods and compared with the reference (grey solid line): variance in PPG amplitude (blue squares), respiratory sinus arrhythmia (black crosses), variation in Spo2 (blue circles). The respiration-rate-to-heart-rate-quotient was fixed to 1:8, 1:6, 1:8, 1:10, 1:8.