5 Common Cardio Myths – Busted!


Karomaza |

For stress relief, cardio is tops!

Not only is it great for your heart but it’s a guaranteed kilojoule burner. While all that good stuff is true, there are some things that are not.  Here are five of the biggest cardio myths you should be careful not to fall for…

MYTH #1: Cardio is your ticket to faster weight-loss

FACT: Hours logged on those fast-paced gym machines are a sure-fire way to melt off the weight – after all, it’s kilojoules in versus kilojoules out, right? Well, yes, but… “You may lose weight faster doing cardio only, but unfortunately it’s the wrong kind of weight,” says personal trainer Greg Justice.

Cardio alone burns away both fat and muscle. For a lasting change, you have to integrate strength workouts into your routine. “Weight training builds lean muscle mass, which elevates your metabolism and burns more fat, even when you’re not exercising,” says Justice. He recommends Metabolic Resistance Training, a hybrid method in which weight training is done at a fast pace, with minimal rest. One example of this double whammy: kettlebell training.

MYTH #2: If you don’t have an hour for cardio, it’s not worth it

FACT: Flat-out not true. All body movement has benefits in terms of kilojoule burn. What you can change, though, is how efficiently you burn them. “You may be able to do steady-state cardio longer, and burn more kilojoules during that time, but the key is what happens after your workout,” says Justice.

“By doing high-intensity interval training [HIIT], which means you incorporate intense periods of work with short recovery, your metabolism is elevated and you’ll be burning kilojoules for up to 38hours after your HIIT workout is completed.”

If you prefer to pray at the altar of the treadmill, take heart. “The American Heart Association says that doing three 20-minute sessions of cardio at a vigorous intensity (like running) is the equivalent of doing five 30-minute sessions at a moderate level (like fast walking),” says exercise scientist Wayne Westcott. Even 10 minutes at a high intensity is beneficial. And a recent study suggests that short, infrequent bouts of slow running can do your heart good. So no excuses that you don’t have the time!

MYTH #3: Doing cardio on an empty stomach torches body fat

FACT: This one comes from the idea that if your body doesn’t have readily available food kilojoules, it’ll dip into the body’s stored supply, shrinking that muffin top. Research bears out that the opposite is true: A 2011 meta-analysis concluded fat burn is consistent regardless of whether or not you’ve eaten before a workout. And other research shows a negative effect of muscle catabolism (muscle loss) from skipping a pre-workout snack. “Your body needs energy to perform and energy comes in the form of food,” says Justice. “I’m not talking about gorging yourself, but having a small snack before doing cardio can actually help you perform at a higher level.”

MYTH #4: It’s important to stay in the “fat-burning zone”

FACT: Like a lot of fitness fallacies, this one is half true. At a lower intensity – the heart rate deemed the “fat-burning zone” – you will indeed burn a greater percentage of your kilojoules from fat. But, as Westcott explains, it’s total kilojoules burned that matter for weight-loss.

The math: If you run at 11km per hour, you burn 25 percent of your kilojoules from fat, while walking at half that speed burns 40 percent from fat, says Westcott, citing past research. So far, walking has an edge.

Bottom line: Working out at a higher intensity equals more kilograms lost.

MYTH #5: If you go for a run, you can skip a legs’ workout

FACT: Unless you’re doing full-on sprints uphill or cranking the bike’s resistance to the point where you can barely push the pedals, you aren’t getting much muscle-building benefit from your workout. So while you feel like your legs and glutes did some work, in order to get the awesome metabolic gains of building up those largest muscles in your body, you have to incorporate strength moves like squats, deadlifts, and lunges. Not only that, strength workouts will make you a better runner and cyclist. “Back when I coached track at Penn State, our runners dominated the sport,” says Westcott. “We were the only ones at the time having our athletes strength-train. Now, of course, everybody does.”

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