Today’s question is one of the most popular among those who are trying to learn how to lose weight, should you perform cardio before or after weights? Today you’ll discover the factual answer to this often debated topic.
Only in recent years has science shed any light on this topic. Until as recently as five years ago, the entire answer to this question was based on theory. This led to people being told different information by everybody they asked for advice.
Now science has provided the answers people were previously unable to get. We’ll be looking at the findings of two studies in particular and analyzing why performing cardiovascular activity before a resistance workout was recently proven to be far more effective. [
Participants in a study at the James Maddison University were subjected to an exercise program over a number of months where one group followed a cardio/weights spit and the others followed a weights/cardio split. The muscle growth in those who did their resistance training first was substantially lower than those on the opposite routine.
For those who are training for fat loss, the findings were also highly in favor of doing aerobic exercise prior to any barbell work. The Journal Of Strength And Conditioning discovered that weight loss, specifically fat loss, was increased greatly in individuals who did their aerobic exercise first.
Most folks at the gym base their opinion on this subject on what works for their own body. While there is nothing wrong with that approach at all, science suggests that those who insist upon working out with weights as soon as they hit the gym could increase results further by switching up their routine a little.
There are two key enzymes which play important roles here:
* mTOR (aka mammalian target of rapamycin)
You may have heard of these before. AMPK is the enzyme responsible for helping the body adapt to endurance exercise, while mTOR is considered an ‘on’ switch in the muscle building process. After you finish a weights workout, your mTOR levels surge for around one hour. This means consuming quality nutrition at this point will ensure quality lean muscle gains. After around six hours, levels of mTOR return to normal. 
By spending that crucial hour still working hard in the gym on a bike or treadmill you do two bad things. Firstly, you waste that golden hour of mTOR release. Secondly, you’ll release more AMPK which actually blunts the release of mTOR, too.
Learning how to lose weight is a journey often shrouded in myths and opinions. However, thanks to the benefits of modern science you now know the true facts behind whether you should do cardio before or after weights to maximize your fat loss results in the gym.