I’m fairly certain at this day and age everyone is familiar
with cardiovascular training, or “cardio”. It’s an extremely successful tool
and should be a part of your fitness program. One of the more popular questions
is where do you fit your cardio in your day in relation to your weight
training? I plan on keeping this article short and to the point, while still
allowing the topic to be significantly discussed.
For most
individuals it is always best to do your cardio training AFTER your weight
resistance training, and should be no more than 15- 20 minutes in duration.
This doesn’t mean your pre-workout warm up jog or walk; this is in reference to
your actual cardio training. Please keep in mind Athletes in general and bodybuilders
preparing for a show are exempt from this due to a variety of factors. This
statement is made to the individual who is considering time and place of his
cardio regimen to maximize results in both weight resistance training and
cardiovascular performance. The next few paragraphs will explain why.
First,
let’s start with muscle fiber varieties. The two categories involved in this
discussion are fast twitch and slow twitch fibers. Fast twitch represent
powerful, highly recruited, short duration fibers. Their main source for energy
production is from carbohydrates, and secondary from fats. They are the main
fibers worked during weight resistance training. Slow twitch represent Long
duration, lightly recruited, heavily fatigue resistant fibers. They are
perfectly designed for “long haul” activities such as many cardio sessions will
provide. Even though slow twitch use some carbohydrates for energy, their main
source is from fats. At this point you may already see the overlap. Both fibers
utilize the same macronutrients for energy, but in different proportions. Both
fibers will initially use carbohydrates for energy, but slow twitch fibers are
better suited for the use of fats for the duration of the exercise. Fast twitch
fibers are better suited using carbohydrates for energy, with fats only being
an option after exhaustion of carbohydrates. So in order to utilize the best of
both fibers it would make sense to train fast twitch initially when blood sugar
is at its peak, then train slow twitch to make its primary energy source the
only available, fats.
This may
also be better explained by discussing a noticeable phenomenon known as “The
Wall”. Distance runners will commonly refer to a time while they are running of
a period where they feel like they hit a wall. They will feel heavily fatigued
for a few minutes, then they notice a “second wind” where their energy levels
return almost stronger then before. “The Wall” refers to the time when the body
has run out of carbohydrates and the small refractory period where energy
systems switch to burning fats. The “second wind” is the beginning of the body
catching up to the energy demands of the tissue through burning fats. Weight
resistance training first will pre-exhaust carbohydrates to allow for the wall
to be noticed much sooner into your cardio regimen, thus increasing the overall
efficiency of the session.
Please keep
in mind as I mentioned earlier, this article was designed to assist an
individual in timing their weight resistance and cardio sessions to maximize
their potential. When Individuals ask about this topic, this is my opinion with
a little actual science added to better get the understanding across. I hope it
helps in building your regimens.
Michael
Petrinjak, CFT
Evolve
Training Systems