I'm pretty sure there is somewhat of a carryover when people are training different energy systems. Afterall, it is rare to be using strictly one energy system at any given time. But, I would imagine that the key would be to manipulate work and recovery time of the intervals so that the heart rate stays in the aerobic range. Basically, you wouldn't want the player's legs to be burning/feel like jello at the end of the session.
Perhaps the distinction lies in your "power endurance" comment. I guess there is a difference between outputing high amounts of power a short time repeatedly (i.e. 5 seconds of output followed by 30 seconds of rest repeated several times) and outputting high amounts of power for an extended period of time (like a 400m runner) and thus each type of performance may require different training techniques.
Please understand, that I was merely posting information that I felt could add to the discussion on this thread. I don't really know enough to add anything meaningfull to what was said on the elite site, nor to debate the accuracy of their statements. My guess would be that most linemen are at a state where most any conditioning would be benificial.
I just found the information interesting and possibly lead to some good discussion because:
1. it went against what I believed and what is commonly said here
2. it came from a respected source
3. it seems logical to me
Kind of reminds me of Chad's new training ideas and the debate they have stirred up.
Regarding the forum topic, does anyone else think that having a set weight goal for the entire line seems pretty dumb? Now the main goal for the OP for the summer is going to have to be to lose weight rather than focusing on getting stronger and more powerful. Furthermore, 275 seems really light for an o-lineman these days. The trend seems to be larger players, and I would think that would be for a reason.
Wouldn't it be better for:
1. coaches to make individual goals for each player
2. have the goals be performanced based like strength to weight ratio, 20 yard sprint speed etc.
3. If there was going to be a target weight, make it based on the individual player. A 6'7" lineman would have a very different ideal weight than a 6'2" lineman. What about a player who is already 300 but has a fairly low bodyfat level (relatively speaking)? It makes no sense for them to drop weight.
The OP could have trained hard in the offseason and come back stronger and faster and in good condition while still being over 300. Now the best case is that he'll be faster and have good conditioning (almost certainly) but not stronger (unless he is really weak now - i.e. a total beginer to strength training) and he'll get pushed around by the bigger linemen he faces next year.