Exhausting Slow Twitch Muscle Fibres
As slow twitch muscle fibres, are exhausted, the faster twitch muscles are automatically recruted to take over. This can happen at a low intensity, providing the duration is significant. In other words, someone can train at an intensity under AET, but be using the faster twitch muscles.
I am fast twitch dominant, and so have less slow twitch endurance potential than many others. Are there any indicators of when slow twitch muscles tire and faster twitch take over? I do 2 hour runs (under AET) to train the ST fibres, but for all I know, I may be using FT for half of this duration? Does anyone have any knowledge or experience of this particular issue?
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