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McGill, SM, Chaimberg, JD, Frost, DM, and Fenwick, CMJ. Evidence of a double peak in muscle activation to enhance speed and force: an example with elite mixed martial arts fighters. J Strength Cond Res 24 (2): 348-357, 2010-The main issue addressed here is the paradox of muscle contraction to optimize speed and strike force. When muscle contracts, it increases in both force and stiffness. Force creates faster movement, but the corresponding stiffness slows the change of muscle shape and joint velocity. The purpose of this study was to investigate how this speed strength is accomplished. Five elite mixed martial arts athletes were recruited given that they must create high strike force very quickly. Muscle activation using electromyography and 3-dimensional spine motion was measured. A variety of strikes were performed. Many of the strikes intend to create fast motion and finish with a very large striking force …