In the table below, you can see the proportional contribution of aerobic and anaerobic metabolism during different running events (800m to 10,000m). One point to note is slow twitch muscles fibre recruitment doesn’t decrease at higher intensities, rather we get increased recruitment of fast twitch (type IIa and IIb fibres). However, as exercise intensity increases, there’s a shift towards increased recruitment of fast twitch muscle fibres. At low intensities we recruit primarily slow twitch muscle fibres. However, as exercise intensity rises (such as during high-intensity interval training) anaerobic metabolism becomes proportionally more important.Ī major factor here is the increased recruitment of type II (fast twitch) muscle fibres. During endurance sports, we meet most of our energy needs through aerobic metabolism. Muscles produce energy through aerobic (requiring oxygen) and anaerobic (not requiring oxygen) metabolism. Increased muscle fibre recruitment – reduces the workload placed on individual muscle fibres which improves fatigue resistance.īoth cardiovascular endurance and muscular endurance are key components of fitness.
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