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Research on skeletal muscle adaptations in Long COVID patients has revealed intrinsic mitochondrial dysfunction, endothelial abnormalities, and a muscle fiber type shift towards a more glycolytic phenotype

This can be measured via a blood test called the Omega-3 Index

doi: 10.1016/j.biopha.2018.07.162 69 SongGSumitBGuangyiYArijitaDMingH
