Watts Doc #12: Can Fiber Type Predict Carb or Fat Use?

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.
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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