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New Muscle-Fiber Girth…

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In yesterday’s newsletter, you saw why a higher-rep set first can do great things for efficient hypertrophy stimulation, not to mention safety…

Using a lighter weight to failure reduces injury risk and joint trauma, acts as a precision warmup, and allows you to train more muscle-fiber types compared to a lower-rep set…

The 15-to-20-rep-set fiber cascade is: 1 (endurance) —> 2a (endurance/power) —> 2b (power)

Illustration of lat muscle fibers

While all of those fiber types have growth capacity, the 2b have the most (illustration above by Larry Eklund)….

But to stimulate all of those fiber types in one higher-rep set to failure, aren’t you creating too much fatigue right off the bat? No…

You go no higher than 20, so cumulative fatigue is not a significant limiting factor. Drug-free Mr. Universe Doug Brignole liked 30 reps.

In fact, the fatigue it does create allows you to stimulate more growth with the next “set,” especially with a rest of only 20 seconds. How?…

The quick follow-up is a Speed Set—1.5 seconds per rep—with the same weight, getting around 8 reps. It’s really a fast-tempo extension of the first set that does some important things…

1) It brings in more high-growth type 2b fibers from the very first rep

2) It trains the fourth fiber type to a degree, type 2x

But wouldn’t longer rests between those sets produce more hypertrophy? Many studies suggest yes; however, this is not a SECOND set…

It’s actually an extension of the first set. The 20 seconds is a rest/pause, which allows you to harness fatigue so you fire more fast-twitch fibers from the very first speed rep…

Keep in mind that the studies showing a hypertrophy advantage for longer rests compare 3-to-5-minute rests with 1-minute rests, not 20 seconds; however…

A recent study did compare longer rests with 20-second rest/pause training, and the 20-second R/P group got slightly better muscle growth in half the workout time. (More on that study in Old Man, Young Muscle 2, Chapter 7: Density for Immensity and Faster Workouts).

So with STX, you get a growth-fiber cascade—a full array of muscle-fiber-type stimulation with that double-barreled approach. And it takes only a quick 2-to-3-minute effort. It’s allowed me to grow with 35-minute workouts three to four days a week at age 64…

Steve hitting a most muscular pose outside of his sauna

Interestingly, there’s another reason that a higher-rep set and condensed workout can benefit older bodybuilders. It’s exciting stuff. More on that in the next training newsletter.

Till next time, train hard—and smart—for BIG results.

Steve Holman
Former Editor in Chief, Iron Man Magazine
X-Rep.com
 

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Filed Under: X Files Tagged With: fiber types, high reps, hypertrophy, muscle fibers

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