This review examines the four phenotypes of OSAHS and looks at how these can be targeted using breathing re-education from three dimensions of functional breathing – biomechanical, biochemical and resonant frequency. The review concluded that breathing re-education and myofunctional therapy could be helpful for individuals across all four phenotypes of OSAHS. McKeown, P, Reina, C, Plaza, G, 2021. J Clin Med, Volume 10, Issue 3, p. 471. Read the Study