FIGURE 8.

Contractile and metabolic properties of a strength/power-trained and an endurance-trained athlete. Characteristics of fast and powerful muscles of strength/power athletes that are accompanied by a more fatigable muscle as compared with endurance-trained muscles with elevated oxidative capacity that are more fatigue resistant. ATP, adenosine triphosphate; CASQ, calsequestrin; IMCL, intramyocellular lipids; MyHC, myosin heavy chain; OXPHOS, oxidative phosphorylation; RyR1, ryanodine receptor 1; SERCA, sarcoplasmic/endoplasmic reticulum Ca²⁺-ATPase; SR, sarcoplasmic reticulum. Illustrations of people were created by kjpargeter/Freepik. Image created with BioRender.com, with permission.