fingers2022
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I think I may have figured it out. The key is to distinguish between the goals for daily activities and exercise. It is also important that the anaerobic system is used during the first 30 seconds or so of exercise AND if you heart rate exceeds the anaerobic threshold (AT).
*During everyday activities, we use aerobic energy for most things. Because our aerobic system doesn't work properly, we have to limit our activity to avoid PEM.
*In CFS, the AT can be low, so we may get into anaerobic exercise during normal daily activities. The body can't handle anaerobic activity for more than a very short time. This is the reason a heart rate monitor is recommended to keep the heart rate below the AT during daily life.
Not sure what you mean by the above, Lesley - when you say the body can't handle long duration anaerobic activity, you seem to imply it's because it's bad for you, but actually you simply have to stop or slow down due to lactate.....it just happens, because you get into oxygen debt. This is interesting - do most sufferers find they have to stop because they quickly get out of breath, lactic acid, or because it hurts too much (muscles etc.)? What is it that physically stops us? For me personally, the only thing that stops me is feeling ill (not fatigued in the normal lactic acid sense), and if I do more I feel more ill, then get more infections etc.
*If you are trying to exercise, aerobic exercise won't work because the aerobic system isn't working properly.
*The anaerobic system does work. The first 30 seconds or so of activity is anaerobic. If you are going to exercise you want to use the anaerobic system, which means doing 30 seconds of activity followed by rest.
So, first 30 secs is anaerobic regardless of intensity? Is this because the heart can't get oxygen around the body fast enough, i.e. there's a lag before we can use the aerobic system? Maybe this is my basic misunderstanding.
Thanks Lesley. If I understand what you're saying, there's an assumption that the AT of ME/CFS sufferers is low, therefore the activity doesn't need to be all that intense by normal standards before the anaerobic system kicks in.
I guess the theory is that the AT is low because the energy systems are damaged, rather than through deconditioning (or possibly a combination of the two?).
So what they are saying is that (relatively) higher intensity activity for short durations is better than lower intensity activity for longer durations. Hmmm, still seems counter-intuitive to me, and because I'm not deconditioned by normal standards, i would have to do fairly intensive activity to get above AT. My experience tells me that I get PEM whichever way I do it, and higher intensity, even if for short durations seems to have more adverse effect on me than lower intensity.
I need to read that paper propoerly. Sorry, this is not a very well thought out post (are they ever?).