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Although central cardiopulmonary impairments limit peak oxygen consumption (<jats:italic>V\u2032<\/jats:italic><jats:sub>O<jats:sub>2<\/jats:sub><jats:sub>peak<\/jats:sub><\/jats:sub>) in patients with PAH, several peripheral abnormalities have been described over the recent decade as key determinants in exercise intolerance, including impaired skeletal muscle (SKM) morphology, convective O<jats:sub>2<\/jats:sub>transport, capillarity and metabolism indicating that peripheral abnormalities play a greater role in limiting exercise capacity than previously thought. More recently, cerebrovascular alterations potentially contributing to exercise intolerance in patients with PAH were also documented. Currently, only cardiopulmonary rehabilitation has been shown to efficiently improve the peripheral components of exercise intolerance in patients with PAH. However, more extensive studies are needed to identify targeted interventions that would ultimately improve patients' exercise tolerance and QoL. The present review offers a broad and comprehensive analysis of the present literature about the complex mechanisms and their interactions limiting exercise in patients and suggests several gaps in knowledge that need to be addressed in the future for a better understanding of exercise intolerance in patients with PAH.<\/jats:p>","DOI":"10.1183\/16000617.0284-2020","type":"journal-article","created":{"date-parts":[[2021,4,14]],"date-time":"2021-04-14T07:32:38Z","timestamp":1618385558000},"page":"200284","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":45,"title":["Exercise intolerance in pulmonary arterial hypertension: insight into central and peripheral pathophysiological 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