Found this to be quite an interesting article, and thought it might be of use to folk and/or spark some discussion. I found his roadblock theory quite interesting, and be interested to hear some more technical opinions if there are any.
Cheers,
George.
- - - - - - - - - -
Heavier Weight, Less Time
by Chad Waterbury
Please Note: T-Nation might not be considered work/family safe.
Chad Waterbury said:Everything I do in terms of training my clients for size and strength hinges on the neuroscience-based Size Principle. This principle states that motor units (the muscle fiber bundle along with its associated neuron) are recruited in an orderly fashion. The smallest, weakest motor units are recruited first. Then, larger, stronger motor units are recruited if higher levels of force are required.
Chad Waterbury said:According to what the Size Principle tells us, as you approach failure you're recruiting the smaller, weaker motor units. This is why the set gets harder. In essence, you're trying to lift a weight after your strongest motor units went to the bench. If you recruited more of the large motor units, or if the large motor units didn't drop out, the set would get easier, or stay just as easy, respectively. But it doesn't because the largest motor units only have the capacity to withstand around 10 seconds worth of ball-busting effort. After that, they're done.
Chad Waterbury said:I have a theory. When you fatigue the smaller, weaker motor units it sets up a roadblock to your biggest, strongest motor units. Remember, the only way to get to the biggest, strongest motor units is by going through the smaller ones. If the smaller ones are fatigued, you can't reach the biggest ones.