a state of coherence: Coherence is the measurement of the harmony of two signals. Whenever two signals increase and decrease in phase, they are in coherence, a state of peak efficiency. Much more about coherence and the benefits of breathing 5.5 times a minute with 5.5-second inhales and exhales can be found in the following: Stephen B. Elliott, The New Science of Breath (Coherence, 2005); Stephen Elliott and Dee Edmonson, Coherent Breathing: The Definitive Method (Coherence, 2008); I. M. Lin, L. Y. Tai, and S. Y. Fan, “Breathing at a Rate of 5.5 Breaths per Minute with Equal
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