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Human skeletal muscle glycogen utilization in exhaustive exercise: role of subcellular localization and fibre type
How muscle sugar stores are used during intense exercise depending on cell location and muscle fiber type
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Abstract
When elite endurance athletes performed one hour of exhaustive exercise, intramyofibrillar glycogen showed more pronounced depletion than intermyofibrillar and subsarcolemmal glycogen.
- Depletion of glycogen differs based on its subcellular localization during and after exercise.
- Type I muscle fibres contained more intramyofibrillar and subsarcolemmal glycogen than type II fibres at rest.
- In highly depleted fibres, remaining glycogen particles clustered together, particularly intermyofibrillar and subsarcolemmal types.
- After exercise, resynthesis of glycogen was notably impaired when only water was consumed, especially for intramyofibrillar glycogen.
- Glycogen localization is influenced by muscle fibre type before exercise and carbohydrate availability during recovery.
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