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However, the mechanisms underlying the skeletal myopathy in patients with HFrEF are not completely understood. We hypothesized that (i) aerobic exercise training (AET) and inspiratory muscle training (IMT) would change skeletal muscle microRNA\u20101 expression and downstream\u2010associated pathways in patients with HFrEF and (ii) AET and IMT would increase leg blood flow (LBF), functional capacity, and quality of life in these patients.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Patients age 35 to 70 years, left ventricular ejection fraction (LVEF) \u226440%, New York Heart Association functional classes II\u2013III, were randomized into control, IMT, and AET groups. Skeletal muscle changes were examined by vastus lateralis biopsy. LBF was measured by venous occlusion plethysmography, functional capacity by cardiopulmonary exercise test, and quality of life by Minnesota Living with Heart Failure Questionnaire. All patients were evaluated at baseline and after 4 months.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Thirty\u2010three patients finished the study protocol: control (<jats:italic>n<\/jats:italic> = 10; LVEF = 25 \u00b1 1%; six males), IMT (<jats:italic>n<\/jats:italic> = 11; LVEF = 31 \u00b1 2%; three males), and AET (<jats:italic>n<\/jats:italic> = 12; LVEF = 26 \u00b1 2%; seven males). AET, but not IMT, increased the expression of microRNA\u20101 (<jats:italic>P<\/jats:italic> = 0.02; percent changes = 53 \u00b1 17%), decreased the expression of PTEN (<jats:italic>P<\/jats:italic> = 0.003; percent changes = \u221215 \u00b1 0.03%), and tended to increase the p\u2010AKT<jats:sup>ser473<\/jats:sup>\/AKT ratio (<jats:italic>P<\/jats:italic> = 0.06). In addition, AET decreased HDAC4 expression (<jats:italic>P<\/jats:italic> = 0.03; percent changes = \u221240 \u00b1 19%) and upregulated follistatin (<jats:italic>P<\/jats:italic> = 0.01; percent changes = 174 \u00b1 58%), MEF2C (<jats:italic>P<\/jats:italic> = 0.05; percent changes = 34 \u00b1 15%), and MyoD expression (<jats:italic>P<\/jats:italic> = 0.05; percent changes = 47 \u00b1 18%). AET also increased muscle cross\u2010sectional area (<jats:italic>P<\/jats:italic> = 0.01). AET and IMT increased LBF, functional capacity, and quality of life. Further analyses showed a significant correlation between percent changes in microRNA\u20101 and percent changes in follistatin mRNA (<jats:italic>P<\/jats:italic> = 0.001, rho = 0.58) and between percent changes in follistatin mRNA and percent changes in peak VO<jats:sub>2<\/jats:sub> (<jats:italic>P<\/jats:italic> = 0.004, rho = 0.51).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>AET upregulates microRNA\u20101 levels and decreases the protein expression of PTEN, which reduces the inhibitory action on the PI3K\u2010AKT pathway that regulates the skeletal muscle tropism. The increased levels of microRNA\u20101 also decreased HDAC4 and increased MEF2c, MyoD, and follistatin expression, improving skeletal muscle regeneration. These changes associated with the increase in muscle cross\u2010sectional area and LBF contribute to the attenuation in skeletal myopathy, and the improvement in functional capacity and quality of life in patients with HFrEF. IMT caused no changes in microRNA\u20101 and in the downstream\u2010associated pathway. The increased functional capacity provoked by IMT seems to be associated with amelioration in the respiratory function instead of changes in skeletal muscle.<\/jats:p><jats:p><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/ClinicalTrials.gov\">ClinicalTrials.gov<\/jats:ext-link> (Identifier: NCT01747395)<\/jats:p><\/jats:sec>","DOI":"10.1002\/jcsm.12495","type":"journal-article","created":{"date-parts":[[2019,11,19]],"date-time":"2019-11-19T18:58:59Z","timestamp":1574189939000},"page":"89-102","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Effects of aerobic and inspiratory training on skeletal muscle microRNA\u20101 and downstream\u2010associated pathways in patients with heart failure"],"prefix":"10.1002","volume":"11","author":[{"given":"Ligia M.","family":"Antunes\u2010Correa","sequence":"first","affiliation":[{"name":"Heart Institute (InCor) University of S\u00e3o Paulo 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