The Best Damn Cardio for Natural Lifters

Figuring out the best way to train for muscle growth and strength is already complex. And it gets even more complicated when you add cardio to the mix. You’ve probably heard or read statements like these before: “Fasted cardio will eat into muscles!” “Low intensity cardio will make you look like a marathon runner!” “Cardio after lifting will negate your gains!” We’ve reached a point where we’re almost scared of doing cardio. We’re afraid of losing our hard-earned muscle. Well, don’t look to “enhanced” bodybuilders for applicable advice. Their use of anabolic drugs counteracts any drawbacks that cardio could have on muscle mass. But don’t throw the baby out with the bath water either. Cardio remains a tool that can help us get leaner and healthier. Let’s look at the best and worst forms of cardio for the natural lifter. Cortisol is Key Cortisol has a significant correlation with muscle mass, albeit an inverse one: the higher someone’s cortisol production is, the harder time he’ll have building muscle and gaining strength. In fact, a higher cortisol level has been correlated with a drop in strength in older individuals (1). And while producing it is necessary for proper human function, too much can kill your gains. It may do so in a few different ways… It can increase muscle catabolism. Cortisol will lead to a breakdown of the tissue to make amino acids that can then be transformed into glucose to be used for energy (gluconeogenesis). That’s one of the main functions of cortisol. It’s not a self-destruct function, but rather, a function designed so that you’ll have fuel when you need it. It may inhibit the immune system. This is important because muscle damage repair (important for growth) is driven by the immune system. By inhibiting the immune system, cortisol can slow down muscle repair and impair growth. It can increase levels of myostatin. Myostatin plays a big role in how much muscle your body will allow you to build. The more myostatin you have, the harder it is to build new muscle. So that means, by increasing myostatin, cortisol can once again diminish muscle growth. An enhanced lifter can handle a lot more cortisol with less negative impact on muscle growth because of the exceedingly high levels of anabolic hormones in his body that can counteract (to an extent) excess cortisol production, at least when it comes to muscle growth. But a natural lifter wants to avoid producing too much cortisol from his cardio work. As such, the best damn cardio for the natural lifter is the one that can deliver results with the least amount of cortisol being released. Two Things Cortisol Does During Training Cortisol has many purposes during a workout. The most important are: It mobilizes energy. It will free up stored glycogen, fatty acids, and even break down muscle tissue to have energy available to fuel muscle contractions. The more energy you need to mobilize, the more cortisol you’ll release. Of course, since the goal of cardio is often to lose fat, you do need to force the body to mobilize some fuel. But too much might offset the fat-loss benefits. It gets us amped up. It increases adrenaline levels by increasing the conversion of noradrenaline into adrenaline. If you need to get amped up, motivated, or are facing something that’s perceived as stressful, you’ll produce cortisol. Doing a high volume of cardio will lead to high cortisol levels and so will pushing to an extremely high intensity level. It helps us maintain blood sugar levels. If blood sugar levels are too low, cortisol and glucagon are released to bring it back up. Why is that important? Because if you exercise in a fasted state, you’ll increase cortisol to a greater extent, especially if you need to mobilize a lot of fuel. “Yeah, but I train fasted and it energizes me!” Of course it does. Go back to what I just wrote – cortisol increases adrenaline levels. Feeling energized is the byproduct of jacking up adrenaline. And while it might make you feel good in the short term, it can do more harm than good if you stay like that for too long or produce it too often. So we have three elements that raise cortisol: Volume or burning a boatload of energy Pushing yourself to the limit Training fasted The Worst Types of Cardio for Natural Lifters The worst types are those that combine a high level of one element or a combination of elements, increasing cortisol above what’s necessary for fat mobilization. 1. Fasted Interval Training Why pick on fasting? Well, I’m not. Taking a 45-minute walk on an empty stomach in the morning is fine, but doing intense intervals fasted in the morning is not. In the first case, sure, you’re fasted (which is one factor to release cortisol) but the intensity is very low (taking a walk can even be calming) and the energy expenditure is low too. A 45-minute walk doesn’t require much glycogen mobilization and doesn’t have a big caloric expenditure. While it’s fasted, the total cortisol output will not be
Origin: The Best Damn Cardio for Natural Lifters