You might find of interest Myhill, Booth and McLaren-Howard's theory of how PEM arises in ME/CFS, and how it involves lactic acid. See this post (under the section entitled "Sarah Myhill et al's Theory of PEM"):
Mitochondrial and Energy Metabolism Dysfunction in ME/CFS — Myhill, Booth and McLaren-Howard Papers
It is also worth pointing out that in the research of Myhill et al, they found ME/CFS patients divide into two main groups, Group A and Group B.
See this post for more info.
- Group A patients try to compensate for the mitochondrial ATP shortage by increasing glycolysis to make ATP.
- Group B patients try to compensate for the shortfall in mitochondrial ATP most likely by using the adenylate kinase reaction to make ATP.
Note that glycolysis can operate in two modes:
According to the research and theories of Myhill, Booth and McLaren-Howard, ME/CFS patients may be forced into generating energy by the inefficient anaerobic glycolysis route because their mitochondria may be dysfunctional.
- Anaerobic glycolysis — this is where glycolysis works independently of the mitochondria in order to supply energy in the form of ATP. When glycolysis works independently, it is much less efficient, and also produces lactic acid as part of its operation.
- Aerobic glycolysis — this is where glycolysis works in conjunction with the mitochondria to supply energy in the form of ATP. When glycolysis works in conjunction with the mitochondria, it is much more efficient, and does not produce lactic acid.
(The theory is that dysfunctional mitochondria are not able to supply sufficient energy during exercise when there is high energy demand. As a result, in ME/CFS the body has to use alternative routes of ATP energy production during exercise, and one of these alternative routes is glycolysis, which takes place in the cytosol of the cell, rather than in the mitochondria. Dysfunctional mitochondria may also prevent aerobic glycolysis from taking place, since aerobic glycolysis involves the mitochondria; instead, ME/CFS patients may be forced into anaerobic glycolysis, as this works without the involvement of the mitochondria.)
Right, but introducing late-onset mitochondrial disease into the equation makes the diagnosis extremely complex. What I am suggesting is something very trivial as a cause for many of us. Our bodies are not supplying enough oxygen to our cells to drive aerobic respiration. There is no need for any mitochondrial dysfunction to crash aerobic metabolism.
Remember that Complex i of the electron transport chain is rate limited by the amount of oxygen available. No oxygen = no aerobic respiration. No aerobic respiration means NAD+ becomes rapidly depeleted and NADH raises. Rising NADH downregulates Krebs. The cell is now desperate for energy and reverts to glycolysis. Increased glycolysis uses up NAD+ and to maintain NAD+ pyruvate is buffered to lactic acid. The hydrogen proton disassociates and now you have lactate and hydrogen protons.
If my version of this is correct, it suggests the disease is not as complex as many have believed, and it might actually have very straightforward "cures". Too early for me to brag about any success. I'll update as I go. But I'm onto something big.
The really useful thing would be for those of you who obtain lactate meters to start testing different peripheral tissues, and then compare against something closer to a major vein in forearm. Look at values at different times of day. Do you - like me - get evidence of hypoxia that is *localized* to particular tissues? That would be totally missed by your doctor, who is only testing an arm draw, from a major vein.
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