The breathing practices investigated in this study, all of which may be considered types of deep breathing, included pursed-lip breathing, left and right unilateral nostril breathing, and loaded deep breathing exercises. Before continuing, I briefly describe these breathing techniques below.

Pursed-lip breathing involves inhaling through the nose and exhaling through pursed lips.

Source: www.psychologytoday.com/ca/blog/finding-new-home/202103/best-breathing-techniques-relaxation-and-pain-relief

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