Riding before breakfast question

DaveyL

Anyone have an opinion on this?

http://jap.physiology.org/content/early ... 0.abstract

"Beneficial metabolic adaptations due to endurance exercise training in the fasted state."

Abstract

"Training with limited carbohydrate availability can stimulate adaptations in muscle cells to facilitate energy production via fat oxidation. Here we investigated the effect of consistent training in the fasted state, versus training in the fed state, on muscle metabolism and substrate selection during fasted exercise. Twenty young male volunteers participated in a 6 week endurance training program (1-1.5 hr cycling @~70% VO2max, 4d/week) while receiving isocaloric carbohydrate-rich diets. Half of the subjects trained in the fasted state (F; n=10), whilst the others ingested ample carbohydrates before (~160g) and during (1g.kg-1 b.w..hr-1) the training sessions (CHO; n=10). The training similarly increased VO2max (+9%) and performance in a 60 min simulated time trial (+8%) in both groups (P<0.01). Metabolic measurements were made during a 2 hr constant-load exercise bout in the fasted state @ ~65% pre-training VO2max. In F, exercise-induced intramyocellular lipid breakdown was enhanced in type I fibers (P<0.05), and tended to be increased in type IIa fibers (P=0.07). Training did not affect IMCL breakdown in CHO. In addition, F (+21%) increased the exercise intensity corresponding to the maximal rate of fat oxidation more than did CHO (+6%) (P<0.05). Furthermore, maximal citrate synthase (+47%) and β-hydroxyacyl coenzyme A dehydrogenase (+34%) activity was significantly upregulated in F (P<0.05) but not in CHO. Also, only F prevented the development exercise-induced drop in blood glucose concentration (P<0.05). In conclusion, F is more effective than CHO to increase muscular oxidative capacity, and at the same time enhances exercise-induced net IMCL degradation. In addition, F but not CHO prevented drop of blood glucose concentration during fasting exercise."

Alex_Simmons/RST

DaveyL wrote:

Anyone have an opinion on this?

My opinion is that it is playing with fire to train fasted on a regular basis.

DaveyL

Alex_Simmons/RST wrote:

DaveyL wrote:

Anyone have an opinion on this?

My opinion is that it is playing with fire to train fasted on a regular basis.

I would agree with that, but what about 1 or 2 sessions a week, provided (1) they are at endurance pace, (2) you were going to do those sessions anyway, and (3) you take on adequate carbohydrate and protein after the session as usual?

I do find it interesting that they are claiming there is a metabolic adaption resulting from this type of training.

dave_1

DaveyL wrote:

P_Tucker wrote:

DaveyL wrote:

You might find that you elicit a more positive response by explaining why you disagree with something, rather than just reaching for that cute little phrase every time.

I disagree, clearly, because he admits that he doesn't know the answer, then goes on to guess what he thinks the answer is. I don't know the answer either, but will offer no half-baked theory as to what the answer might be. It's worse in his case because he's a respected coach, so people will eat up his theories as though they were gold plated FACTS.

Except it is you, and not Friel, who is presenting Friel's theories as "gold plated FACTS". Go back and read his blog and stop being such a drama queen.

From what I can see, Friel is very open in stating several times that not enough research has been done to answer the question definitively. With that in mind, he identifies several ways in which an effect could be seen, and what that might mean in terms of training.

give over daveyl! You talk the talk but, you don't know much about cycling at a decent level so less of your tone!

DaveyL

Dave_1 wrote:

give over daveyl! You talk the talk but, you don't know much about cycling at a decent level so less of your tone!

Perhaps you'd be better off playing the ball rather than the man, Fergus.

DaveyL

Some interesting stuff in this short article from Asker Jeukendrup:

http://www.nutrifit.co.uk/Conference_bh ... urning.pdf

It seems to be taken from the book of his I mentioned in a previous post.

Just in case Dave_1 decides to comment again - Jeukendrup was an elite level Dutch cyclist and is now an accomplished and successful ironman athlete, so hopefully he has cycled at a level high enough for his opinions to count...

Loretta Damage

Riding fasted comes recommended in this week's Cycling Weekly.

meanredspider

Loretta Damage wrote:

Riding fasted comes recommended in this week's Cycling Weekly.

With what reasoning?