Should You Do Cardio Before Weights Or After?

By Russ Howe


Should you do cardio before or after weights in the gym? If you are learning how to build muscle this is undoubtedly a topic which will pop up at some stage. Today we'll answer this question for you.

It is not uncommon to hear a different answer each time you ask somebody for advice in the gym. That's because a lot of the health and fitness industry is built upon opinion rather than fact. There are many areas which haven't yet been scientifically researched enough and, until recently, this was one of those areas.

Over the last five years or so, there have been a number of tests on subjects to figure out the definitive answer to this popular fitness myth.

Contrary to mainstream opinion, you should be performing your cardiovascular workout prior to hitting the weights if you want to get the most out of the gym. This will surprise a few people out there, because one of the most common mistakes is to presume that you'd exhaust the muscles if you did your aerobic activity first.

Up until recently that theory made a lot of sense. However, when scientists carried out tests they found that those who performed aerobic activity prior to lifting weights actually enjoyed superior lean muscle growth as well as superior fat loss!

Even subjects who were performing HIIT got the same overall results.

How is this possible? It's mainly down to two enzymes which the body releases during prolonged exercise activity. Those two enzymes are AMPK and mTOR. AMPK is the enemy of building lean muscle tissue. It's released to help the body adapt to endurance exercise, so you'll notice this enzyme during cardiovascular activity.

The second enzyme, mTOR, is the key which turns on the muscle building process after a resistance training session. The bad news is that AMPK kills off mTOR, meaning if you stay in the gym after a training session and perform prolonged cardiovascular exercise you are significantly blunting your own muscle building process. Granted you can still achieve results, but they would be significantly superior if you did things the opposite way around.

When the body increases it's release of mTOR enzyme it's signalling the beginning of the so-called 'golden window' for nutrition. This is the often fabled period of time where your body will make the most of any nutrients you provide it with. Release is increased for up to six hours.

This information comes in very handy for those who like to separate their workouts into two separate sessions per day. If you keep six hours between each workout you'll be able to get the full benefits of the muscle repairing process switched on by mTOR enzyme before you release any AMPK during cardiovascular activity.

When you are trying to lean how to build muscle in the gym, you'll encounter many areas which are shrouded in mystery and doubt, often coming down to little more than personal opinion. Thanks to ongoing scientific research, however, the question 'Should you do cardio before or after weights?' is no longer something which falls into this category.




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