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Review
Division of Pediatric Cardiology, Stanford University, Palo Alto, California 94304
Exercise provides one of the most severe, yet physiological, stresses to the intact cardiovascular system and is a major determinant of the utilization of metabolic substrates. The adaptations to exercise are the result of a coordinated response of multiple organ systems, including cardiovascular, pulmonary, endocrine-metabolic, immunologic, and skeletal muscle. With the proliferation of genetically altered murine models of cardiovascular disease, the importance of developing methods of accurate physiological phenotyping is critical. There are numerous examples of transgenic models in which the baseline cardiovascular phenotype is unchanged or minimally changed from the wild type, only to become manifest during the stress of exercise testing. In this review, we cover the basics of the murine cardiovascular response to exercise and the importance of attending to strain differences, compare different exercise methodologies (constant workload treadmill, incremental workload treadmill, swimming) and hemodynamic monitoring systems, and examine the murine response to exercise conditioning. Several examples where exercise studies have contributed to the elucidation of cardiovascular phenotypes are reviewed: the ß-adrenergic receptor knockouts, phospholamban knockout, dystrophin knockout (mdx), and the mutant 
-myosin heavy chain (R403Q) transgenic.
ß-adrenergic receptor knockout; skeletal muscle; phospholamban knockout; dystrophin knockout; mutant -myosin heavy chain transgenic
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