Mitochondria: The Aerobic Engines
5/18/06
Words by Kirk Willett
In particular, long, exclusively easy rides do not appear to effectively promote mitochondrial development and/or bolster the size of one’s aerobic engine. The process of building a bigger aerobic engine appears to be skewed towards an accumulation of high intensity training over time. Eventually though, it is largely the ability to deliver oxygen to our mitochondria which limits the rate at which our mitochondria can generate ATP from the variety of organic molecules that can be oxidized. Without adequate oxygen, the chemical reactions involved in aerobic respiration are impaired. The primary reason our aerobic engines can only be so big is because our cardiac output and our blood’s oxygen carrying capacity can only be so good!
Once one gets beyond engine size, there are other factors which can influence performance. One cannot expect to have reached their performance potential in extremely long endurance events on a diet of exclusively one hour rides with high intensity intervals. The targeting of an event’s expected, more specific demands, such as a combination of the total work and the distribution of that work, is likely to be of benefit. In at least the weeks leading up to target events, an additional 1-2 rides per week can augment the 20MP+ training discussed above. It may be that these days are combined with the 20MP+ work. For example, if one is targeting an event expected to require 4000kj’s, it would be wise to include some training in preparation for the event which approximates those demands, even if such training is not likely to be helpful in building a larger aerobic engine.
The next time you are out there training, think about your mitochondria sucking up that oxygen and powering your body. They are your friends…diligently providing the matrix a portion of the enzymes responsible for the chemical reactions which power your muscles. It would also be a good idea to think about how to efficiently get more of them when trying to build your aerobic engine as big as it can be. Generally, you have to go hard to make them grow! The bigger the engine, the faster one can go! Train hard, rest hard, train hard again, and have fun along the way!
Source :-
http://www.biketechreview.com/performan ... ondria.htm