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In page Arteriovenous oxygen difference:

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The maximum a-vO2 diff is also usually greater in trained athletes than in untrained individuals.[citation needed] This is a result of aerobic exercise leading to hypertrophy of the slow twitch muscle fibres mainly due to increased capillarisation. The increase in capillary beds in the muscle means that blood supply to that muscle can be greater and diffusion of oxygen, carbon dioxide, and other metabolites increases.[2] With training the muscles also improve in their ability to extract oxygen from the blood and process the oxygen,[2] possibly due to adaptations of the mitochondria and an increase in the muscle's myoglobin content.[citation needed]