ThePolishHammer said:
What is failiure defined as?
3 types of failure, concentric, isometric and eccentric.
for this discussion it looks like concentric is the topic.
from what ive been reading lately, going to failure or even sticking and being forced back on the concentric places very damaging stresses on the myosin crossbridges. ie similar to heavy eccentric work. this in turn can greatly increase recovery time and possiblity of DOMS.
i have avoided training to failure, only going to fatigue (last rep i can squeak out alone) and my recovery time is quick. i feel ready to train that bodypart soon after, with increases in strength.
the TUT principle has been mentioned frequently but not MAX tension. TUT is great but max tension is what is stimulating white fibers. max tension is the portion of the set that counts for strength and size. olympic/pl'ers are notorious for low reps, short sets etc. and have some awesome strength and size because they train at max intensity for a short duration. doing singles, triples, even 5's, plyos etc. in many sets adds up the true MAX TUT. a bodybuilder's set of 8-12 is ramping in intensity only reaching max tension on the last 2-3 or so depending on whether there are forced reps given.
maybe some white fiber stimulation in the early part of the set but not to the intensity that it could because the load is low to facilitate the higher reps. the "ramping" intensity will primarily stimulate intermediate fibers due to their characteristics. the white fibers (IIb) get some work in the beginning provided the rep speed is faster to allow for more to be "turned on". with the loads light, the excitation threshold is not always reached for these white fibers all at once (maximum recruitment). as the set wears on, some white fibers have fatigued, mostly intermediate (IIa) are working due to their nature. the reason most of the research states (8-12) for hypertrophy is probably due to the fact that there is a well rounded effect (of stimulation) in that rep range. some IIb stimulation, some IIa stimulation and enough intensity to increase sarcoplasmic adaptation too.
all this is fine from a bodybuilders point of view because the goal for a bb'er is overall hypertrophy. so SR gains, some white fiber growth, increased capillarization, satellite cells etc, will overalll effect the size of the muscle. but for those looking at strength and size a lower rep scheme to work in a more maximum effort setting would be more productive.
<opinion>i look at size gains as being an increase in cross sectional area (CSA) of the muscle which is directly correlated to strength increase. (call me old school) so that would mean i would train for strength and size will follow. i appreciate that there are other means to make a muscle larger, but as an indivudual my muscle needs to be as functionally strong as it is large. </opinion>