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Wrong.
When someone performs an activity for longer than 30 seconds, the body does not break down muscle to use for energy. Whoever stated that, knows little to nothing about the physiology of the human body.
Most likely it's more that I'm misunderstanding. But....am I correct in understanding that if we can lower something for longer than 30 seconds, we aren't using our fast twitch muscle fibers?
You can also think of this:
The dark meat on a chicken, is slow twitch muscle (because of richer blood supply) and the white meat, is fast twitch muscle.
We aren't talking about wrinkles or gravity or age spots here. We are talking specifically about body fat. Why shouldn't a woman or a man have roughly the same amount of body fat at 50 as they had at 20?
For men, it's because our bodies change and we don't produce as much testosterone as we used to.
I'm not sure what you mean by; "lower something"?
Eccentric or negative motion. From what I understand, we can lower a lot more weight than we can raise.
Yes, the negative portion of resistance training (like lowering the weight back down to your chest in a bench press) is the eccentric portion of the exercise.
In fact, there is a type of resistance training called; negative training, in which the eccentric portion of the movement is focused on, with very slow movements with more weight that can be handled in the concentric portion of the exercise.
That's exactly the type I'm referring to. An example would be to lower the body into a squat position with the weight on one leg and the other leg raised up. The concentric movement would be using both legs to raise back up into a standing position.
I think we've said this earlier in the thread---I believe, if it's truly enough weight that would employ the use of our fast twitch muscle fibers---one wouldn't even be *able* to train as much as regular resistance training. Those muscles (as I'm understanding) take much longer to recover (since they're not designed for regular use).
Any type of quality resistance training where the exercise can only be performed for say; up to 15 repetitions, requires rest periods between training episodes for the muscle fiber to recover.
It one trains hard enough, there are micro tears to the muscle fiber, which induces repair and for the muscle to also adapt to the activity by becoming stronger. This is why, you don't perform higher intensity strength exercises on back to back days.
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