Originally posted by rollers
The original post also had to do with improving fat metabolism with diet. We have all agreed that bonking is bad. What about reducing carbohydrate intake to induce fat metabolism but not so much that the trainee bonks?
Thanks Rollers, interesting question and while I haven't seen any data specificaly on this (I don't think any would exist); here is my take....
*Training with low glycogen levels (casued by low carbohydrate intake) will ultimatley reduce exercise capacity through reduced intensity and duration that can be acheived. Riding in a low glycogen state will also be more fatiguing and may result in a lower number of rides being completed in the week as well. This results in a lower capacity to train and adapt.
*Training with low glycogen levels will be difficult as it is difficult to determine glycogen levels (no simple measures) and it would be difficult to avoid glycogen depletion in a single session or following a series of sessions. So, it would be difficult to manage this low glycogen state or know when its at its optimum.
*Should you be able to increase fat meatbolism in this way; why would this 'transfer' or 'carry over' to exercise in a glycogen loaded state (i.e. the state at which you should be racing in).
*Increasing the rate of fat metabolism may benefit the cyclist by delaying glycogen depletion at a given workload; however this is more easily done by eating carbohydrate in training and racing.
*Training in a low glycogen state weakens the immune system more than thraining in a glycogen loaded state.
*Training adapations that alow you to metabolise more fat (i.e. increased aerobic enzymes, increased mitochondion, increased capiliarsation, etc.) are associated with increases in aerobic measures like VO2 max and LT. Training aerobic capacity directly rather than manipulating diet will no doubt increase fat metabolism more. Such training (i.e. intense or long duration) would be hard in a low glycogen state.
*Training in a low glycogen state is not SPECIFIC; as you should not be racing in that state and training in a low glycogen depleted state is unlikely to be the best way of increasing fat metabolism.
*Due to greater work capacity in the glycogen loaded state, there is potential for larger energy expendatures during single exercise bouts. This is important for weightloss given that the main determining factor in weight loss is energy intake v's energy expendature.
Hope this helps and better answers your questions. Perhaps you should consider what your goal is specificaly; specific training is likely to allow you to meet the goals faster than any single dietary manipulation.