Systems and methods for facilitating physiological coherence using respiratory training are disclosed. In one embodiment, an optimal respiratory cycle and/or RSA pattern is determined. A subject is then trained to adhere to this optimal respiratory level using one or more breath indicators. In another embodiment, the timing sequence of the breath indicators is optimized for a given subject's reaction time and/or atypical breathing events. In yet another embodiment, a subject's respiratory rhythms are used to detect their emotional state and corresponding feedback provided.