Marines who received MMFT showed greater reactivity ( heart rate -LSB- d = @ -RSB- ) and enhanced recovery ( heart rate -LSB- d = @ -RSB- , breathing rate -LSB- d = @ -RSB- ) after stressful training ; lower plasma neuropeptide Y concentration after stressful training ( d = @ ) ; and attenuated blood-oxygen-level-dependent signal in the right insula and anterior cingulate .