You've seen it all over the news lately: Genetic engineering is the hottest and most controversial thing in
science tight now Just mention cloning or the topic of genetic influences in athletic performance and see
what kind of reaction you get.
Science is in fact demonstrating that genetics governs just about everything in our lives, including our
success in the gym. Despite Thomas Jefferson's statement that "All men [and women] are created equal," every
individual adapts differently to resistance training. These genetic factors seem to he quite evident when it
comes to abs.
If you train and train and just can't seem to bring out your six-pack, several factors may be involved:
bodyfat levels (this also has a strong genetic component, in addition to diet), proper exercise selection,
and performing the right number of repetitions and sets to stimulate growth. The key to maximizing your genetic
potential is to determine what rep, set and intensity ranges develop your abs best and how to manipulate your
diet sufficiently to drop bodyfat.
Fast-Twitch vs. Slow-Twitch Muscle Fibers
Human muscle-fiber types can be divided into slow-twitch (Type I) and fast-twitch (Type II) muscle fibers. We're
all born with a certain percentage of fast- and slow-twitch fibers., and most of us have about 50% of each. If
you look at the rectus abdominis, it displays a true 50-50 distribution between fast- and slow-twitch muscle
fibers. Some studies have suggested that the amount of fast- or slow-twitch fibers you possess could play an
important role in regulating the amount of bodyfat you carry.
One study looked at the fiber-type distribution of the rectus abdominis in humans and their ability to store
fat. A correlation was observed between abdominal fat deposition, fiber type distribution and insulin sensitivity
in obese individuals, and a connection was demonstrated between the amount of Type 1 fibers and the level of
bodyfat in these subjects. It would also appear to apply to non-obese individuals.
We're now learning that having a high degree of bodyfat has a certain genetic component. We also know that
muscle-fiber composition has a genetic link. With that in mind, plus the results of this study, we see that
fiber composition along with your sensitivity to insulin may impact truncal fat deposition (the jiggle around
the middle). So, if you have a large distribution of slow-twitch fibers and are insulin-resistant, you're
probably going to have an easier time depositing fat in your abdominal region. Guess what? No six-pack.
But what does this really mean in terms of improving your physique? If you're one of those individuals with a
higher percentage of Type I fibers, are you doomed to a life without a six-park? Ultimately, genetics do determine
the degree of success you can have in sport not everybody can build biceps like Arnold Schwarzenegger. But
everybody can build muscle. Now, if you're stuck with more Type I fibers than you'd like, don't view this as the
end of the road. In fact, in response to intense bodybuilding, your Type I fibers can take on the properties of
Type II fibers. Therefore, it's highly suggested that you pump iron, diet seriously and not worry too much about
Love Handles & LPL
Ever wonder why you can't get rid of your gut? The answer, once again, lies in part in your genetic code and in
a substance found in your body called lipoprotein lipase (LPL). LPL is an enzyme responsible for the uptake and
storage of fatty acids in your body. The greater your LPL levels in a certain region, the more bodyfat you'll
store in that area.
Recently a study investigated the relationship between testosterone levels, LPL activity and fat accumulation
in adult males, Researchers found that sex steroids suppress adipose-tissue LPL activity, which means that men
with high levels of testosterone might store less bodyfat because the LPL would be sequestered. What's interesting
about this study is that LPL activity decreased more in the thigh region than in the abdomen.
The role of genetics as a governing factor for success is perhaps most visible in bodybuilding. Understanding
your genetics will enable you to customize your workouts and your eating program. Set goals realistic to your
body type and, most of all, remember that bodybuilding is an individual sport. Self-improvement - not comparing
yourself to others in the gym is the key.