Tnx for great discussion here…
Here is a short version of Scott Vass article regarding aerobic development and HIIE performance (RSA)! I believe this will explain you in more detail physiological mechanisms regrading VO2max and RSA! Take a look:
http://www.powerdevelopmentinc.com/abstracts/hiie.html
McMillan et al, stated that 4mins high intensity runs (over a poligon) DO NOT decrease speed, explosivness etc, but done with regular soccer practice (and what was the soccer practice anyway during the study?) I dont know about your experiences with theese types of run, but as I stated before they can induce too much of a bLA, which can indirectly decress speed via greater rest needs… Just a thought!
On the other hand, some author states that running over anaerobic threshold (OBLA) increases peripheral factors of aerobic capacity, while the running below OBLA increase central factors (pumping volume, etc). In HIIE game, the heart DOES NOT have time to “speed up” enough, so I think that for “recovery” (RSA) are more important peripheral factors (hemoglobin, capilarization) and NEURAL factors (better control of blood reditribution, lungs, heart), and for this reasons, the best deal for aerobic development in game sports (HIIE) is running over a OBLA, in intervall manner without allowing too much of bLA to accumulate… The solution: TEMPO!
Steady states runs can be done, but in game itself, there is no steady stated, but the system must all the time “to catch” the stabile state, also, the hip movement in long slow distance runs is too small, so athletes are not prepared for greater hip excursion during a game: The solution: TEMPO, POLIGONS, SHUTTLES!
No! VO2max will be increased more with high intensity runs for less than 6mins! But, again, is your goal in improving VO2max and the results on physiological tests, or the game performance?? Please, do not conlcude that I said that something is wrong, bad or something. No! I just want to say that some things are more OPTIMAL for praticular sport, position, time in the season etc… OPTIMAL is a key word!
could you give an example of a sprints/weights circuit?
I will give you the example for basketball. The time motion analysys showed that the average HI action lasts for about 4sec and the largest for about 13-14sec, with the average low intensity activity lasting 21sec. The 30% of HI activity is a side shuffle (defence slides).
So, you can conduct sprints/poligons with simmilar work to rest ratios, for example designe some poligon consisting of forward run, side shuffles, skip, backward run which last for about 13-14sec to complete, and give the player a rest of about 20sec. This is also highly dependent on player position.
On my opinion, this type of conditioning is provided by the game practice itself, so generaly speaking there is no need for additional training of this types of activity, because it is covered in game tactics simmulations etc (and in more specific way).
For discussion on weight circuit take a look here:
http://www.charliefrancis.com/community/showthread.php?t=11783
They can be used to imporve “work capacity”, but you should look for corret technique all the time! Also, the body circuits (jumping jack, step ups, lunges, squats, bla bla bla) can be also used instead of tempo! I explained this in couple of threads…
Hope I helped!