Is Cardio Better Before Or After Resistance Training?

By Russ Howe


If you are trying to maximize lean muscle growth, should you do cardio before or after weights? This question is regularly asked in gyms around the world by folks trying to learn how to build muscle quickly and today we'll answer it with the latest scientific findings.

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.

Thankfully, several high profile studies have now been carried out and confirmed the answer to this common gym query.

The answer may surprise you. Despite popular opinion, you should be performing your cardiovascular work before you begin weight training. Most instructors and fitness enthusiasts recommend doing it the other way around, the theory behind that approach being that if you hit the weights after a cardiovascular session your muscles will already be significantly worn out.

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!

This also applied to individuals performing high intensity interval training, too.

This happens because of the release of two enzymes in the body during physical exercise. They are known as AMPK and mTOR. AMPK is the body's call to action to help you adjust to aerobic 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.

The release of mTOR signals the beginning of the muscle building process in the body, meaning this golden window lasting around one hour is a fantastic time to consume quality nutrition to enhance your results further. This period lasts a total of 6 hours, so you ideally don't want to be performing aerobic activity during this time.

If you choose to separate your training into two sessions, bear in mind what we have just pointed out. Research shows that you should separate your two training sessions by at least six hours, so if you want to hit the weights first thing in the morning and then the treadmill later in the day that is absolutely fine, just ensure there is enough time between both sessions to maximize your results.

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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