GNARL wrote:And why are some athletes still so successful even with improper training for flexibility?
I don't know that there is any study concluding that static passive stretching before a workout hinders performance or causes injury when an appropriate warm-up is performed after the stretching and before the workout (which I assume occurs). I think Kurz's point is that static passive stretching before a workout is a waste of time because its effects are inconsistent with the purpose of a warm-up: "Warming up has to prepare all systems of the body in order for the athlete to perform at top efficiency. It has to affect the heart, blood vessels, nervous system, muscles and tendons, and the joints and ligaments. The goals of the warm-up are: an improved elasticity and contractibility of muscles, greater efficiency of the respiratory and cardiovascular systems, a shorter reaction time, improved perception, better concentration, improved coordination, and regulation of emotional states, especially before competitions." (Article 12.
http://www.stadion.com/column_stretch12.html)
Static passive stretching does just the opposite. Here's a sample: From Article 4: "Static stretches do not facilitate . . . neural pathways, do not prepare the nervous system and blood vessels in the muscles for the dynamic task. You even sweat differently when warming up with dynamic actions than when doing static stretches. During dynamic exercises you sweat all over and your sweat is hot. During static stretching you sweat little, mainly on the face." (
http://www.stadion.com/column_stretch04.html) In Article 5, Kurz states, "[t]he principle of specificity states: Flexibility is specific to the speed of movement. Flexibility is also position specific, so static exercises or stretches like splits are not very useful [for] dynamic flexibility." Also, "[f]or several seconds or even minutes following any type of static stretch, you cannot display your top agility or maximal speed because your muscles are less responsive to stimulation—your coordination is off. Static stretches reduce the force production of the stretched muscles." (Article 5.
http://www.stadion.com/column_stretch05.html)