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.
Determinants of Endurance In Well Trained Cyclists
Type IIx myosin heavy chain transcripts are expressed in type IIb fibers of human skeletal
Interrelationships between muscle fibre type, substrate oxidation and body fat.
The Muscle Fiber Profiles, Mitochondrial Content, and Enzyme Activities of the Exceptionally Well-Trained Arm and Leg Muscles of Elite Cross-Country Skiers