Question

State the reasons for delayed fatigue in red muscle fibers.​

Answer 1

Factors that affect muscle contraction and fatigue;

The production of skeletal muscle force depends on contractile mechanisms, and failure at any of the sites upstream of the cross-bridges can contribute to the development of muscle fatigue, including nervous, ion, vascular and energy systems.7 Specifically, metabolic factors and fatigue reactants during the process of contraction, such as hydrogen (H+) ions, lactate, inorganic phosphate (Pi), reactive oxygen species (ROS), heat shock protein (HSP) and orosomucoid (ORM), also affect muscle fatigue.

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Answer 2

The reasons for delayed fatigue in red muscle fibers are as follows:-

• The red muscle fibers are rich in blood capillaries and myoglobin. They also contain a greater number of mitochondria than the white muscle fibers.
• Also, in contrast to the white muscle fibers, red muscle fibers carry out aerobic respiration and the accumulation of lactic acid is prevented.
• Thus, they can contract for a long time while the white muscle fibers get fatigued after short periods of contraction.