http://speedtrainingsecrets.com/blog/uncategorized/fight-or-flight-which-fiber-types-are-used.html by Dr. Larry Van Such Tue, 07 Sep 2010 00:31:24 +0000 http://wordpress.org/?v=2.6.5 http://speedtrainingsecrets.com/blog/uncategorized/fight-or-flight-which-fiber-types-are-used.html#comment-1532 Sharif Mon, 10 Dec 2007 15:54:08 +0000 http://speedtrainingsecrets.com/blog/uncategorized/fight-or-flight-which-fiber-types-are-used.html#comment-1532 NO!! The fast twitch muscles are used first and they are what provide speed. Slow twitch muscles are what takes over after 20 min. NO!! The fast twitch muscles are used first and they are what provide speed. Slow twitch muscles are what takes over after 20 min.

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