Feeling exhausted after workouts?

I'm wondering if somehow prolonged under-oxygenation can be a trigger. When it happens for a certain amount of time, maybe the brain thinks, it's nap time to restore it. I do think it has to be in combination with something else too, rather then just not enough oxygen. I used to do a lot of breath diving in my younger days, so I can hold my breath really well, and know how to hyperventilate pretty effectively... and neither of those have a significant effect on their own. I played with it over the years, and didn't spot a pattern. But, I think maybe in combination with other things, it may trigger sleepiness. Couple things I know about myself is: 1. I have chronic mild anemia (hereditary thallasemia, my red blood cells are too small - similar to what Pete Sampras has.) 2. Fast thyroid, my heart rate tends to get high quickly.... that combined with anemia, I'm not much of a sprinter, I'm out of air very quickly when sprinting. 3. Looong circadian rythm... I'm more comfortable on a 30 hour schedule then 24. 4. Low blood pressure. 5. Autoimmune issues - arthritis and sclerosis. I am very comfortable with breathing while swimming... easy three count, long relaxed exhaling under water... So I'm not holding my breath and struggling, which I know is one of the things that can cause extra exertion, and reduced oxygen. I never had a cardiopulmonary stress test. I wonder what that would reveal. My baseline EKG is normal. I have a vague suspicion this has something to do with cardiopulmonary inneficiency that kicks in in certain situations.... and maybe being in water changes the blood pressure a bit. I heard somewheer that people with heart and lung disease tend to have a lot of sleepiness, because if inefficiencies in their functions. What's frustrating is that I can't seem to pinpoint what it is, to bring it on, or to avoid it. I used to think it's because I'm not a morning person, and I was doing 5AM workouts, but since then I learned that time of the day isn't "it". I've started keeping FLOG diary here on the website, maybe I'll spot some patterns over time. 1. I have anemia on and off, depending on certain female issues I'd rather not get into here. It's reasonable to expect that it's more "on" lately than "off," although I haven't been tested in awhile. 2. Check on the fast heart rate -- have always had it, regardless of level of fitness 3. Don't know about the circadian rhythm, but I tend to want to stay up late and sleep late. 4. Low blood pressure -- check. 5. No autoimmune issues, but I do have exercise-induced asthma. So, yes, many of the same issues as you. I'm interested in your prolonged under-oxygenation hypothesis -- it seems plausible to me. Maybe it's that, specifically under situations of heavy exertion when the muscles are demanding a lot of oxygen.

I'm wondering if somehow prolonged under-oxygenation can be a trigger. When it happens for a certain amount of time, maybe the brain thinks, it's nap time to restore it. I do think it has to be in combination with something else too, rather then just not enough oxygen. I used to do a lot of breath diving in my younger days, so I can hold my breath really well, and know how to hyperventilate pretty effectively... and neither of those have a significant effect on their own. I played with it over the years, and didn't spot a pattern. But, I think maybe in combination with other things, it may trigger sleepiness. Couple things I know about myself is: 1. I have chronic mild anemia (hereditary thallasemia, my red blood cells are too small - similar to what Pete Sampras has.) 2. Fast thyroid, my heart rate tends to get high quickly.... that combined with anemia, I'm not much of a sprinter, I'm out of air very quickly when sprinting. 3. Looong circadian rythm... I'm more comfortable on a 30 hour schedule then 24. 4. Low blood pressure. 5. Autoimmune issues - arthritis and sclerosis. I am very comfortable with breathing while swimming... easy three count, long relaxed exhaling under water... So I'm not holding my breath and struggling, which I know is one of the things that can cause extra exertion, and reduced oxygen. I never had a cardiopulmonary stress test. I wonder what that would reveal. My baseline EKG is normal. I have a vague suspicion this has something to do with cardiopulmonary inneficiency that kicks in in certain situations.... and maybe being in water changes the blood pressure a bit. I heard somewheer that people with heart and lung disease tend to have a lot of sleepiness, because if inefficiencies in their functions. What's frustrating is that I can't seem to pinpoint what it is, to bring it on, or to avoid it. I used to think it's because I'm not a morning person, and I was doing 5AM workouts, but since then I learned that time of the day isn't "it". I've started keeping FLOG diary here on the website, maybe I'll spot some patterns over time. 1. I have anemia on and off, depending on certain female issues I'd rather not get into here. It's reasonable to expect that it's more "on" lately than "off," although I haven't been tested in awhile. 2. Check on the fast heart rate -- have always had it, regardless of level of fitness 3. Don't know about the circadian rhythm, but I tend to want to stay up late and sleep late. 4. Low blood pressure -- check. 5. No autoimmune issues, but I do have exercise-induced asthma. So, yes, many of the same issues as you. I'm interested in your prolonged under-oxygenation hypothesis -- it seems plausible to me. Maybe it's that, specifically under situations of heavy exertion when the muscles are demanding a lot of oxygen.