Re: Poznań, I Love You
: 16 wrz 2011, 11:59
Łukasz co do beczki...tam trwała walka:)Polecam!!!
http://bieganie.pl/forum/viewtopic.php?f=20&t=23937
http://bieganie.pl/forum/viewtopic.php?f=20&t=23937
Bieganie, Trening, Maraton, Plany Treningowe - największe biegowe forum w Polsce!
https://bieganie.pl/forum/
Bieg Lewego obejrzymy(polsatowcy):)rosz pisze:Jesli ktos jeszcze nie wie, dzisiaj Bekele staruje w Brukseli na 10000m. Transmisja Polsat sport 20:00 chyba ze jakis cwaniak ma canal + sport to 15:30
i z innego źródła, podobnieRoss Tucker dla http://www.sportsscientists.com pisze:Basically, when you are running, a great deal of muscle activity occurs in the milliseconds BEFORE your foot lands on the ground. Why? Well, the muscle is 'pre-activating' in order to increase stiffness of the leg and joints ahead of landing. The stiffer muscle not only absorbs more shock, but it also helps the muscle-tendon unit to store more energy.
Think of the muscle-tendon as a spring. When you land, the muscle lengthens, in what is called an eccentric muscle contraction. As soon as you then push off, for what is called the concentric part of the running stride, you can 'harness' the energy that was stored when you landed. The concentric contraction is more powerful and more efficient, if it follows the eccentric contraction. It therefore uses less oxygen and energy to do the same job, or can do a better job. This is why if you want to jump up as high as possible (for example, to slam dunk a basketball), you bend down and then 'bounce' back up - you are taking advantage of what is known as the "Stretch-shortening cycle" to improve the performance of your jump.
The same goes for running, where this Stretch shortening cycle is critical to performance. The result of all this pre-activation and concentric-eccentric contraction is that the CONTACT TIME is reduced, and performance is improved. Fatigue during the course of a 5km time-trial has been shown to impair the ability of the muscle to "pre-activate", and the result is that your contact time with the ground goes up. Imagine a ball bouncing off a wall - if it gets softer and softer, it bounces off much more slowly, whereas a very stiff ball returns quickly (golf ball vs squash ball, for example).