Perform Better!

I am going to the Perform Better Seminar in LA tomorrow, super excited to see Mike Boyle, Alwyn Cosgrove, Grey Cook and Todd Durkin.

Here is a repost from Alwyn Cosgroves site on:

Aerobic Training and Post-Workout Afterburn

January 21st, 2010

A recent study from the University of Colorado (published in the Journal of Applied Physiology) had participants perform an hour long easy ride and monitored the “afterburn” – to see how much fat they burned post workout.

They didn’t burn any more than they did if they hadn’t exercised.

From the New York Times:

To their surprise, the researchers found that none of the groups, including the athletes, experienced “afterburn.” They did not use additional body fat on the day when they exercised. In fact, most of the subjects burned slightly less fat over the 24-hour study period when they exercised than when they did not.

WAIT — An hour long EASY ride didn’t have an afterburn effect?

Really? I’m shocked….. you’d think that an hour of pedaling easily would melt the pounds off these people (note sarcasm)

And the title of the study: ” When energy balance is maintained, exercise does not induce negative fat balance…” ?????

Really? If you burn 300 calories (and there is no afterburn effect or additional post-workout caloric burn) and then you replace those calories you don’t lose fat?

Again — REALLY? Who’d have thought that? (note sarcasm again)

I understand that wasn’t the point of the study – but did they really think that an easy ride would increase post workout fat burning significantly? Did they also really think that – for example burning 300 calories and then eating 300 calories would have resulted in fat loss?

I think I’ve said A LOT that low intensity aerobics doesn’t create any post workout increase in metabolism. I’m just surprised that people still thought it did.

The researchers concluded:

These data suggest that when exercise is performed with energy replacement (i.e. energy balance is maintained), 24 h fat oxidation does not increase and in fact, may be slightly decreased. It appears that the state of energy balance is an under appreciated factor determining the impact of exercise on fat oxidation.

First off I don’t think anyone thinks that energy balance is an under appreciated factor. I think we all know you have to burn calories (although I do think our understanding of calories in vs calories out is probably incomplete).

But performing low intensity aerobic work in that state could LOWER fat oxidation (burning) post workout — In other words it could potentially be a negative?

(For the record – Dr. Eric Serrano showed me research that he had done on aerobic work actually hurting fat loss back in the mid 90s)



About MaxOut Performance Fitness
Sergio Maldonado is a Sports Performance and Fitness Coach in the San Francisco Bay Area. He strives to be the best at what he does through training, professional development courses, and practice. The purpose of this blog is to get out some of the knowledge that he obtains to better help others in their pursuits towards fitness and a better life.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: