not Luv2run wrote:
Our calorimetry is limited genetically. So any proposal of a training induced increase in oxygen uptake has to be explained with reference to this.
It is reasonable to propose an optimal hematocrit/plasma ratio for a race that is within the normal range. And if you observe changes in heart rate you can estimate changes in plasma volume and its effect on oxygen delivery and heat dissipation.
Regarding weight loss both short term (fluid and glycogen loss) and long term (fat loss and sometimes muscle mass also) we lose power when we lose weight and gain power when we gain weight. So when we train and race we are constantly trying to balance efficiency and power whilst maintaining homeostasis of heat production and dissipation.
But these are metabolic issues separate from biomechanical efficiency which comes from elastic energy return which has zero metabolic cost. And from neural conditioning which improves our ability to maintain a task for longer. And there is another factor which is much harder to explain; our emotional state and its effects on our performance.
My argument with beliefs of altitude training and blood mavvnipulations is this dumbing down race performance to hematocrit, and ignoring so many factors. It's beyond bad scivv vence, it's just plain idiotic.
If a anyone believes a higher hematocrit delivers more ATP, then this has to be explained in calorimetry. But since Luv2run other wilfully ignorant people refuse to recognize this, then all they are doing is endorsing bad science.
That's one of the things about the more complex model. It includes all these things like muscles, blood, nerves, tendons, psychology, efficiency, economy, external factors like drafting and pacing, etc.
Maybe our calorimetry is limited, but are we hitting that limit? Or do we hit other limits first?
Once again, we have this study where 3 groups performed differently depending on which group they were in.
It is hard for me to accept that calorimetry was a limiting factor when the two altitude groups both improved.
I would agree the mechanisms of why they improved, and the reasons the sea level group did not, need further research which doesn't appear to be being done. This is not all that important for me, as a runner, since "trial and error" is also an effective scientific approach. I don't look at oxygen uptake, or blood values, or lactate values, or CO2 output, but at the end results, as measured by a stopwatch.