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A comment on 5-min breathing workout lowers blood pressure as much as exercise, drugs (2021). Parent comment
I believe this study used the POWERbreathe K-Series: https://www.powerbreathe.com/product-category/breathing-trai...
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I believe this study used the POWERbreathe K-Series: https://www.powerbreathe.com/product-category/breathing-trai...