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• W2034409336 abstract "Skeletal muscle blood flow is coupled with the oxygenation state of hemoglobin in young adults, whereby the erythrocyte functions as an oxygen sensor and releases ATP during deoxygenation to evoke vasodilation. Whether this function is impaired in humans of advanced age is unknown.To test the hypothesis that older adults demonstrate impaired muscle blood flow and lower intravascular ATP during conditions of erythrocyte deoxygenation.We showed impaired forearm blood flow responses during 2 conditions of erythrocyte deoxygenation (systemic hypoxia and graded handgrip exercise) with age, which was caused by reduced local vasodilation. In young adults, both hypoxia and exercise significantly increased venous [ATP] and ATP effluent (forearm blood flow×[ATP]) draining the skeletal muscle. In contrast, hypoxia and exercise did not increase venous [ATP] in older adults, and both venous [ATP] and ATP effluent were substantially reduced compared with young people despite similar levels of deoxygenation. Next, we demonstrated that this could not be explained by augmented extracellular ATP hydrolysis in whole blood with age. Finally, we found that deoxygenation-mediated ATP release from isolated erythrocytes was essentially nonexistent in older adults.Skeletal muscle blood flow during conditions of erythrocyte deoxygenation was markedly reduced in aging humans, and reductions in plasma ATP and erythrocyte-mediated ATP release may be a novel mechanism underlying impaired vasodilation and oxygen delivery during hypoxemia with advancing age. Because aging is associated with elevated risk for ischemic cardiovascular disease and exercise intolerance, interventions that target erythrocyte-mediated ATP release may offer therapeutic potential." @default.
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• W2034409336 date "2012-07-06" @default.
• W2034409336 modified "2023-09-30" @default.
• W2034409336 title "Impaired Skeletal Muscle Blood Flow Control With Advancing Age in Humans" @default.
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• W2034409336 doi "https://doi.org/10.1161/circresaha.112.269571" @default.
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