Look down. Can you see your shoes?
No? Alright then, keep reading.
Everyone is looking for a “quick fix” when it comes to fat loss and body composition improvements but no one wants to accept the fact that hard work and consistency account for most of the results.
However, research has shown that specific styles of training can have a dramatic effect on your caloric expenditure at rest if executed correctly.
Enter afterburn training.
EPOC: The True “Secret” for Weight Loss?
Excess Post-Exercise Oxygen Consumption (EPOC), commonly referred to as “afterburn” training, is quite popular these days and with good reason. EPOC is essentially a metabolic state where your body continues to use higher levels of oxygen after intense exercise in order to return to homeostasis.
Most studies have shown that individuals will burn 5 calories for every extra liter of oxygen consumed during an intense workout.
Whether you are performing HIIT (high-intensity interval training), machine based circuits, or free weight variations, everyone is talking about EPOC training and for good reason.
I know what you’re thinking, that all sound kind of cool but what about some real world application? How much of a benefit am I actually going to get from EPOC?
Well, some studies have shown that afterburn training boost your metabolism for a mere 24 minutes all the way up to an incredible 38 hours post-exercise.[8,12] Not only that, you can burn an additional 76 to 150 calories while sitting on your couch because of your ramped-up metabolism after a good EPOC session.[1,7]
That being said, many experts will recommend high-intensity workouts lasting up to 60 minutes. I’m just going to throw this out there – if your intensity is actually borderline high, you’ll have a tough time lasting 20 minutes, let alone 60.
How Intense is High Intensity?
While high-intensity can definitely vary between many of the EPOC studies you come across - varying from 70% VO2max, 75% VO2max, and even 85% of your 8 rep max - for this article we are simply referring to exercising at a VO2max of 70%.[1,7,9] This equates to a heart rate of roughly 155 beats per minute for a 25 year old man which could be hard to maintain for 60 straight minutes…even for more experienced fitness enthusiasts.
Besides the physiological difficulty, many of us don’t have the mental energy to dedicate an entire 60 minutes to a grueling workout given our hectic, fast-paced lifestyles which are already incredibly mentally draining.
Kind of tough to find a balance, huh? Do you just give up and accept defeat or is there a simpler way?
Intensity and Time: Balancing the Scales
Welcome to the best of both worlds.
I’m talking about still eliciting a significant EPOC response without killing yourself on a treadmill for 60 minutes. It’s all about creating the afterburn effect in a timely response – it’s a time trade-off where we still achieve a significant metabolic benefit without breaking the time bank.
Quinn and associates conducted research in which participants performed high-intensity exercise (70% VO2max) for 20, 40, or 60 minutes and then determined the corresponding EPOC effect. As you might guess, the EPOC effect was greatest in the 60 minute experimental group but it was still present in 20 minutes group with over half of the benefit (56.5%) of the EPOC reaction as the 60 minute group.
In other words, they saved 40 minutes while still receiving a significant EPOC effect (close to 50 additional calories) – that’s quite a substantial benefit given they were exercising for a 3rd of the time. As long as we stay at a high intensity for at least 20 minutes we can still get a significant EPOC effect!
Obviously we need to look at all of the EPOC research as a whole rather than focusing one study in particular, but this study helps to illustrate that you can still elicit a significant EPOC effect even if you don’t have 60 minutes to dedicate to a workout.W