Regardless of progress made in scientific research and real world observations suggesting certain practices are not only useless but also counterproductive to goals at hand, some myths just don’t want to go away.
Before I dissect aerobic training myth let’s consider the context. While preparing for endurance events, aerobic training is part of a sound training regiment. However, in terms of training for strength and power, aesthetic improvements, or to improve health, aerobic type of training is not only fruitless, but can be counterproductive.
Let’s go over some definitions before getting to the meat of the matter. Cardiovascular training refers to any exercise in which heart and lungs are involved (jogging, sprinting, lifting weight etc.). If you heart rate and respiratory rate are elevated – you are performing cardiovascular work.
Aerobic training refers to a state in which cardiovascular work is being performed. It is low intensity work that can be sustained almost indefinitely for as long as oxygen is being supplied in adequate amounts.
To sum it up – all aerobic training is cardiovascular training. But not all cardiovascular training is aerobic.
Quick History Lesson
When Jane Fonda popularized aerobic training in 1970′s, everyone was all over it. It was the trend of the time. Around the same time cardio equipment manufacturers were investing significant amounts of money in product development. And to back-up effectiveness and need for their products, large amounts of money were also being invested in research to support cardio equipment. Guess who founded that research? Give yourself pat on the back if you guessed ‘equipment companies’. To this day this is a big venture. You don’t have to look far for prove, just check out latest Bowflex gizmos.
As years passed by, researchers began to question effectiveness of this type of training in athletic realms. It didn’t take long for coaches to realize that the more aerobic training the athlete did, the more power and strength they lost. As popular saying goes – aerobic training made joggers out of jumpers. So athletic community turned to evidence based, sport related training instead. And health and fitness industry held onto the hype and continues to prescribe aerobic training for all the wrong reasons to people who need it the least.
Fat-burning Zone
This concept suggests your body burns greater amount of fat while exercising at lower intensities – this is a misrepresentation.
While it is true your body burns greater percentages of fat at lower intensities than it does at higher intensities, high intensity training burns way more total calories and more fat calories overall.
At lower intensities your body may burn 50% of the calories from fat, while at high intensities it may burn 35% of calories from fat. Taking this to its logical conclusion – your body will burn greater amount of fat as percentage lying on the couch and thinking about getting lean than doing anything else right? And we all know how well lying on the couch works for fat loss…
It’s the as percentage part that has been misrepresented and misunderstood.
Aerobic Training and Specific Adaptation to Imposed Demands (SAID) Principle
Common believe is that added “cardio” makes your body more efficient fat burning machine and raises metabolism. Former is very true (don’t get excited yet), latter is far from it.
As your body adapts to aerobic training it becomes more efficient and better at using fat as fuel source, meaning it burns less of it! Just like fuel-efficient car uses less fuel to travel longer distances. When selecting a vehicle that gets more gas mileage, you select a car with a small engine that burns less fuel and gets more miles to the gallon, right? But when it comes to fat burning you want to be gas-guzzling machine. You want to be the Corvette, not the Prius.
Here is the thing about metabolism…aerobic training demands very little work from muscles so it doesn’t really require muscle tissue to stick around. And muscle is the only tissue that burns fat in the body. So how is that metabolism-enhancing? It simply isn’t. Since aerobics does nothing to even maintain muscle, never mind build muscle, it will do nothing to raise your metabolism at rest. Over time you are making your fat burning engine smaller and smaller. Not only that, but now to burn more fuel – fat, just like the car, your only choice within aerobic options is to just go longer and longer, which only enhances the effect of burning less and less fat. Is there much joy in running 40 mins to burn the calories you once burned in 20 mins?
This is the exact opposite of why you began doing aerobic training to begin with!
Let’s use chickens and ducks as example. If we consider how each one of them moves, we can see how they program their bodies to respond in a specific way to the nature of the activity they perform. Chickens move with short bursts of high intensity ‘sprints’, if you ever tried catching your own chicken you know exactly what I am talking about. It is no coincident their meat is very lean. However, ducks are migratory, and travel long distances during winter months. Consequently, they have a high-capacity to store fat. If you ever had duck meat you know what I mean. This is adaptation!
But there is more to it…
The way body adapts to stimuli is counterintuitive to our thinking. Don’t drink any water? Your body will retain water. Does resistance training build muscle and strength? No it doesn’t. Resistance training tears muscle down. Your body responds and adopts to resistance training by getting bigger or stronger. So in aerobic training, does your body become more efficient at it, and adapts by sending transcription message to use fuel (fat) more efficiently and hold onto it every chance it gets…yes it does! And that’s just not effective.
But there is even more to it…
Research suggests high volume of aerobic training converts fast-twitch muscle fibers to slow-twitch (making joggers out of jumpers), and decreases production of endogenous testosterone and human growth hormone which can negatively affect aging processes and zap strength. Cumulative effects of junk volume aerobic training include: loss of lean muscles mass (as mentioned above), overuse injuries (repetitive movement in single plane, limited range of motion), muscle imbalances, and decreased neuromuscular coordination which can result in faulty patterns of muscle recruitment (non-functional muscles).
Hardly the reasons why people begin to exercise on the first place!
These are long-term, cumulative elements of adaptation very few trainees and trainers ever consider. Instead, they overemphasize the immediate response from one single workout. That is little short-sided to me.
Better Approach is Smart Approach
If you’re going to show up at the gym, I suggest you invest your time instead of spending it. Do work that matters. Real training is smart training. It is programmed for you, and with you in mind. To read more about smart training check out Notes on Training Towards Goal Achievement article.
I will discuss other, more appropriate alternatives to aerobic training in following articles.
Summary
Aerobic training has been grossly over-rated in terms of improving health, performance enhancement, and definitely over-rated for fat loss. Quite frankly I believe overemphasizing aerobic training robs you, the trainee, off of many benefits you hope for when beginning to exercise. I also think this is part of the reason why some many trainees give up on their endeavour and quit exercising. They are often led down the path of misinformation.
Here is the thing. What you just read is not only my opinion and definitely is not “this-just-in, groundbreaking news.” People who I consider experts in my field have been screaming very same message for years now with tons of research to back them up. But very few choose to listen. Instead, majority of trainees and so-called “industry experts” with group-thinking mentality choose to be traditionalists rather than rationalists. And, to me, this is really disconcerting. Consumer beware.
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As always, thanks for reading.
Darius
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