They first analyzed the sedentary individuals and then sought to identify the pathways impacted by long-term ET (>4 years) and determined the age effect. They found that skeletal muscle aging in older sedentary adults decreased mitochondrial genes and pathways involved in oxidative phosphorylation (production of cellular energy by using oxygen) while elevating pathways in redox homeostasis.
In older adults compared to their younger counterparts who chronically perform ET, however, those differences were absent. ET did, however, impact nearly twice as many genes in younger compared to older participants including down-regulation of gene transcripts involved in protein ubiquitination and the ERK/MAPK pathways.
This study demonstrates that in individuals who are chronically endurance trained, the transcriptional profile is normalized for mitochondrial genes but aging impacts the number of genes that respond to ET including many involved in protein homeostasis and cellular stress.
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Source: Chronically endurance-trained individuals preserve skeletal muscle mitochondrial gene expression with age but differences within age groups remain
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