Energy system of Type 1 fibres is aerobic.

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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

Energy system of Type 1 fibres is aerobic.

Explanation:
Type 1 fibres are slow-twitch and packed with mitochondria and myoglobin, which equips them for sustained, oxygen-using energy production. In endurance activities they rely on oxidative phosphorylation in the mitochondria, using fats and carbohydrates with a steady supply of oxygen to generate ATP. This makes their energy system predominantly aerobic, designed for long-duration, fatigue-resistant work. The anaerobic energy systems are more typical of fast-twitch fibres that contract quickly for short bursts, so they’re not the primary fuel source for Type 1 fibres.

Type 1 fibres are slow-twitch and packed with mitochondria and myoglobin, which equips them for sustained, oxygen-using energy production. In endurance activities they rely on oxidative phosphorylation in the mitochondria, using fats and carbohydrates with a steady supply of oxygen to generate ATP. This makes their energy system predominantly aerobic, designed for long-duration, fatigue-resistant work. The anaerobic energy systems are more typical of fast-twitch fibres that contract quickly for short bursts, so they’re not the primary fuel source for Type 1 fibres.

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