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Lungs & Muscles (cont.)
"However there are two component parts to that statement. First there is the strength of the muscles; then the fuel for the muscles.
"As you probably know we store fuel called muscle glycogen that is converted with the presence of oxygen (aerobic) into energy.
"So you have multiple processes and all interlocked - the efficiency of the heart and lungs in the uptake of oxygen and the release of carbon dioxide; the muscle strength; and the fuel content.
"The to further complicate it there is the presence of lactic acid (a by product of energy production) and its absorbtion back into the 'fuel' system.
"After a longer period of exercise then we have the added dimension of rehydration - as you rightly state.
"All of this will be tempered by the tolerance of the athlete to symptoms and the effects of these processes. What you are calling "the mental will".
"As to furthering our ability to 'listen to the body' I think you are demonstrating that very well. The development that you chart it seems to me a result of doing just that - listening to the body and interpreting the feedback.
"While I am a great believer in this there is a cautionary note: in the case of rehydration it is too late to wait until you feel thirsty. Programme your rehydration just as you would the petrol tank in the car i.e.don't wait until you are literally running on empty."
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