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The episode starts off with a primer on parts of muscle needed for contraction and how these relate to different methods of fiber typing (there's more than one!). We finish our look at a classic paper on cycling physiology and its sections on fiber type and substrate use. Then a paper on cross country skiers throws a bag of monkey wrenches into decades of established fiber type paradigms.
Show Notes Determinants of Endurance In Well Trained Cyclists https://www.ncbi.nlm.nih.gov/pubmed/10668757 Type IIx myosin heavy chain transcripts are expressed in type IIb fibers of human skeletal muscle. https://www.ncbi.nlm.nih.gov/pubmed/7545970 Interrelationships between muscle fibre type, substrate oxidation and body fat. https://www.ncbi.nlm.nih.gov/pubmed/10490806 The Muscle Fiber Profiles, Mitochondrial Content, and Enzyme Activities of the Exceptionally Well-Trained Arm and Leg Muscles of Elite Cross-Country Skiers https://www.frontiersin.org/articles/10.3389/fphys.2018.01031/full
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