anaerobic threshold (anˈ·
·rōˑ·bik threshˑ·hōld),
·rōˑ·bik threshˑ·hōld),n at increasing speeds or intensity levels, the point above which the muscles derive their energy from nonoxygenic rather than oxygenic sources during exercise. The body can only operate above this threshold for a short period of time, such as when sprinting, before lactic acid builds up in the muscles.
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