Fatigue resistance of Type 2b fibres is low.

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Study for the Advanced Subsidiary WJEC Physical Education Test. Engage with flashcards and multiple-choice questions, each providing hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Fatigue resistance of Type 2b fibres is low.

Explanation:
Fatigue resistance describes how long a muscle fibre can continue to generate force during sustained or repeated work. Type IIb fibres are fast-twitch glycolytic fibres that are built for short, powerful bursts. They rely mainly on anaerobic glycolysis, which quickly runs out of fuel (glycogen) and produces lactate and hydrogen ions. This buildup disrupts muscle processes and makes activity harder to sustain. They also contain fewer mitochondria and have less capillarization, so oxygen delivery and aerobic recovery are limited. All of this means they tire quickly, so their fatigue resistance is low.

Fatigue resistance describes how long a muscle fibre can continue to generate force during sustained or repeated work. Type IIb fibres are fast-twitch glycolytic fibres that are built for short, powerful bursts. They rely mainly on anaerobic glycolysis, which quickly runs out of fuel (glycogen) and produces lactate and hydrogen ions. This buildup disrupts muscle processes and makes activity harder to sustain. They also contain fewer mitochondria and have less capillarization, so oxygen delivery and aerobic recovery are limited. All of this means they tire quickly, so their fatigue resistance is low.

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