1.
Study –

Dynamic stretching for 30 seconds increased leg extension strength.  Static stretching did not influence strength.

2. A review of studies –

Generally, a warm-up to minimize impairments and enhance performance should be composed of a submaximal intensity aerobic activity followed by large amplitude dynamic stretching and then completed with sport-specific dynamic activities. Sports that necessitate a high degree of static flexibility should use short duration static stretches with lower intensity stretches in a trained population to minimize the possibilities of impairments.