A Systematic Review of the effects of stretching prior to Strength-Shortening Cycle movements, such as jumping and sprinting was publish by Springer International Publishing Switzerland 2013. The authors Heidi Kallerud and Nigel Gleeson found that dynamic stretching produce better results when it comes to jump and sprint performance. The only reason static stretching should be used is if an athlete needs to emphasize a full ROM for the movement of their sport.  For example, a hurdler for track and field.

Image from < http://viberehabblog.files.wordpress.com/2013/11/dynamic-stretching-and-static-stretching.jpg

Here's the detailed abstract available from Google scholar through SpringerLink
http://scholar.google.com/scholar?q=Effects+of+Stretching+on+Performances+Involving+Stretch-Shortening+Cycles&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ei=6OFXVLH9O9WyyASlooKAAg&ved=0CB0QgQMwAA

'Squat Muscle Activity' by Bradley A. DeForest, Gregory S. Cantrell et al.

'Squat Muscle Activity' by Bradley A. DeForest, Gregory S. Cantrell et al.

Cool comparison of forces behind different squat forms. See if you want to mix up your workouts!

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