Aerobic training and fat burning in the gym
Aerobic training is a familiar topic in discussions about fat burning, but that does not mean it is always the best tool. Part 2 of the Effective & Permanent Fat Loss Symposium, held on Saturday 15 April at the Grand Hotel in Malahide, focused on “Fat Loss with Interval Training”, and Charles Poliquin challenged several widely held beliefs.
Why aerobic training deserves a critical look
Many of us have seen it: someone spends months doing steady, easy-paced cardio, works up a real sweat, yet sees little change in their body. You may have experienced it yourself or noticed it happening to someone else at your fitness club. Poliquin’s message was direct: if you rely solely on long, frequent bouts of aerobic exercise to burn fat, progress soon stalls.
He argued that even in aerobic sports, maximal oxygen uptake is often given too much importance. The athletes at the top do not always have the highest values. Those who stay at the top can sustain high intensities for long periods, perform while lactate accumulates and recover well enough to do it again.
This does not mean that gentle activity is pointless. Walking, easy cycling or exercise at a low heart rate can support health and recovery. The question is whether aerobic training should be your main method of burning fat when your goal is a visible change in your physique.
How aerobic training affects fitness
According to Poliquin, the anaerobic energy system should be developed before the aerobic system. He considered it a myth that an aerobic base is always a prerequisite for anaerobic work. Adaptations in slow-twitch muscle fibers do not automatically improve the recovery capacity of fast-twitch muscle fibers, and in his view, there is no direct relationship between maximal oxygen uptake and intervals that cause lactate to accumulate.
For anaerobic training, he emphasized the order: power first, then capacity. Put simply, speed before speed endurance. Aerobic work often follows the opposite logic, but that may not be the best approach for fat burning and athletic fitness.
One of his more provocative claims was that the greater your aerobic capacity, the lower your anaerobic power may be. The original account cited Pakarinen and Keskinen here. In plain English, spending too long doing aerobic training at the same easy pace may compromise your explosiveness and ability to produce powerful efforts.
A related warning concerned children’s training. Charles recommended avoiding regular aerobic training that becomes too repetitive for children up to 12 years old, because 90% of coordination develops by that age. Children benefit more from varied movement: jumping, throwing, running, climbing, playing and trying different sports.
Interval training for fat burning
So what actually happens? Interval training makes your body do a lot of work in a short time. The effort is intense, rest is limited and the next interval demands renewed focus. This type of work taxes fast-twitch muscle fibers, increases post-workout energy expenditure and keeps your body active for longer after the workout.
Poliquin stated bluntly that aerobic interval training is not very effective for burning fat because you reach a plateau within 8 weeks, and it lasts a lifetime. Smiling on stage, he repeated: “…and lasts for your life, for your life, for your life!” It was deliberately provocative, but the point stuck. If the same activity produces the same result, do not expect a miracle.
In his coaching practice, he used anaerobic interval training for fat burning. The original account gave an example in which clients lost an average of 9 kilograms of fat in 12 weeks when this was combined with dietary adjustments. That figure does not mean everyone should expect the same result. Rather, it shows that aerobic training, nutrition and consistency need to work together.
According to him, the main benefits of anaerobic interval training were clear: hypertrophy of fast-twitch muscle fibers, improved aerobic capacity in fast-twitch muscle fibers, a greater increase in metabolic rate than with conventional aerobic training, and greater post-workout fat burning.
Practical signs to watch for
The simple truth is that hard aerobic training does not work if recovery breaks down. Poliquin emphasized that athletes need to train on the edge of overtraining, but that boundary must be carefully managed. This is not permission to run yourself into the ground every week.
- reduced or absent psychological readiness;
- a shift in the DHEA/cortisol ratio toward cortisol, measured with a blood test;
- a decrease in body weight;
- reduced appetite.
He made a distinction when discussing sleep problems. Overtraining caused by training volume may actually increase your need for sleep. A problem caused by intensity, however, may leave you unable to feel rested after sleeping. This distinction matters in practice because the solution differs between the two cases.
Charles highlighted several potential risks of excessive, frequent aerobic training: osteoporosis, especially in women; cases of Alzheimer’s disease associated with excessive training volume; cases of mononucleosis; a weakened immune system; mineral deficiencies; excessive cortisol production; increased oxidative stress when training outdoors; and, finally, a slower metabolism. These are strong claims, so they should be considered in context rather than treated as slogans.
From my own experience, I can confirm that systematic interval training is an effective way to get fitter and stay lean. But it requires a sensible training load, good technique and nutrition that supports your goal. Intervals cannot make up for a haphazard diet or too little sleep.
Aerobic training FAQs
So is aerobic training bad for you?
No. A one-sided approach is the problem. If your goal is to burn fat and improve your athletic fitness, long, easy cardio sessions should not be your only tool.
Is interval training suitable for beginners?
Yes, as long as you increase your training load gradually. As a beginner, you do not need to start with maximum effort. Shorter intervals, good technique and adequate recovery are enough.
Why does fat burning plateau?
Your body adapts to a repeated training load. If your aerobic training, pace and diet stay the same, your results rarely change either. This is where interval training can provide a new stimulus.
To be continued…
Author: Fred Antson
Come and work out! ArtGym
