The Effect of Slow-Paced Breathing on Cardiovascular and Emotion Functions: A Meta-Analysis and Systematic Review Summary: A meta-analysis of existing literature on the effects of slow-paced breathing on cardiovascular indices, including HR, HRV, and BP, as well as on negative emotions.The training showed a moderate effect in reducing SBP, moderate-to-large effect in increasing time-domain HRV, and a small effect in reducing HR.Also, slow-paced breathing may reduce negative emotions such as perc...