Monday 130520

Workout

Dead Lift
Use 90% of your 1 RM and complete
5 x65%
5 x75%
AMRAP x85%

MetCon
Midday – 3 Rounds of Barbara
Evening – Helen

From Runner’s World

How Good of a Workout is CrossFit?

Some physiological data from one popular workout.

By Scott Douglas Published

May 17, 2013
Push-Up

The value of CrossFit for runners has been hotly debated the past couple of years. Is CrossFit a good supplement to running? A replacement for running? A small study conducted in Alabama provides some useful real-world information on what happens physiologically during a CrossFit workout.

Nine adults who had been doing regular CrossFit sessions for at least three months did a popular CrossFit workout known as “Cindy.” It consists of doing a set of 5 pull-ups, 10 push-ups, and 15 air squats, and repeating that set as many times as possible within 20 minutes.

During the workout, the exercisers reached an average intensity of 63% of VO2max, a measure of aerobic output. The American College of Sports Medicine classifies workouts done at an intensity between 64% and 90% of VO2max as “vigorous intensity.” In running terms, working out at around 65% of VO2max corresponds with steady running, neither a jog nor a harder effort like a tempo run or track workout.

During the 20-minute workout, the exercisers burned an average of 260 calories. Using the general guideline of 100 calories burned per mile, this roughly corresponds to running 2.5 miles in 20 minutes, or averaging 8:00 per mile for 20 minutes.

This study suggests that this CrossFit workout gives reasonably fit adults who are accustomed to that mode of training a decent 20-minute workout.

That’s not the same, however, as saying that it’s equivalent to a steady 20-minute run. If you’re training to run faster, the specificity of your workouts becomes more important than for people aiming for general fitness. If you’re one such runner, consider workouts like the above CrossFit session more a supplement to your running than a replacement.

In addition, as Runner’s World editor-at-large Amby Burfoot pointed out earlier this week, impressive-looking calorie-burning totals for short, high-intensity workouts need to be put in context. You might burn more calories doing 20 minutes of intense CrossFit work than in running easily for 20 minutes, but you can probably burn more total calories from easy running, simply because you can sustain the activity for longer.

The study’s findings will be presented later this month at the annual meeting of the American College of Sports Medicine.

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4 comments on “Monday 130520

  1. One workout (Cindy) and only discusses CrossFit in terms of caloric burn? If your 20:00 WOD is equal to a 20:00 jog, then you’re not working nearly hard enough.

  2. Have to point out that in a study on the Games site a while ago, they noted that intense workouts also have the effect of burning way more calories in the couple of hours afterwards as you recover. Recovering from a jog is much easier for the body and doesn’t require as many calories.

    Also, I call BS on the calories anyway. Jess has tested her calories burned in CF workouts and they are generally much higher than going for a run of an equal length. These people don’t sound like they’re working that hard if they’re burning just 260 calories in a full Cindy.

    And even so, is your goal just to burn calories? Or do you give a shit about actually getting stronger and generally more fit? If so, you’re not getting that from just running.

  3. No comments on long term increase in muscle mass of Crossfit “Cindy” type movements over running? Do you not have a higher increased Metabolism with more muscle?

  4. Would be helpful to know average # of rounds achieved by the participants in 20 minutes to get a better idea of intensity. 63% VO2 max correlates to “steady running” according to them, which is remarkably easier than a 20 minute all out effort in Cindy.

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