Blog Post

5 Cardio Myths De-Bunked

At the end of a rough day, the rhythmic swooshing of the elliptical,
whir of a bike, or patter of feet on the belt of a treadmill might sound
like music to your ears—for stress relief, cardio
is tops. It’s also, of course, awesome for your heart (um, it’s in the
name), and a definite calorie burner (though you already know not to trust the calorie counter on the display). Still, while all that good stuff is true, there are a lot of fallacies running around out there, and following them may be stopping you in your fitness tracks. Here, five of the biggest cardio myths: [Source: Women’s Health Magazine]

MYTH #1: Cardio, cardio, and more cardio is the 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 calories in
versus calories out, right? Well, yes, but… “You may lose weight faster doing cardio only, but unfortunately it’s the wrong kind of weight,” says Kansas City-based 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 to commit to the cardio gods, it’s not worth it.
FACT: Flat-out not true. All body movement has
benefits in terms of calorie 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 calories 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 calories for
up to 38 hours 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, Ph.D. 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 maximum body fat.
FACT: This one comes from the idea that if your body
doesn’t have readily available food calories, 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 (a.k.a. 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” if your aim is to burn fat.
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 calories from
fat. But, as Westcott explains, it’s total calories burned
(those pesky calories out) that matter for weight loss. The math: If you
run at seven miles per hour, you burn 25 percent of your calories from
fat, while walking at half that speed burns 40 percent from fat, says
Westcott, citing past research. So far, walking has an edge. However, at
that seven miles-per-hour pace, let’s say you’d burn about 500 calories
in 30 minutes, or 125 fat calories. At the 3.5 mph walking pace, let’s
say you’d burn about 250 calories in the same time (and 40 percent of
250 is only 100, so the “fat-burning zone” doesn’t win that race,
either). Bottom line: Working out at a higher intensity equals more
pounds lost.

MYTH #5: If you go for a run or a bike ride, you can skip a legs’ strength 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 (and yet you push), you ain’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.”