If I'm not mistaken, I though I read Dante saying something about IP-6 helping control Hematacrit levels.....I might be completely off base. If he sees this, maybe he can add his input, but he's a busy guy.
Stewie??
Btw, the same Dr. John Crisler who had the heart attack was also in the "high hematocrit is okay" team.He was extremely fit and active, regularly doing cardio, controlling his BP, etc. Access to the best medicine, advice from his peers, etc.
Hematocrit is associated with carotid atherosclerosis in men but not in women.
https://www.ncbi.nlm.nih.gov/m/pubmed/12826926/
Atherosclerosis is another major factor in heart attack/stroke risk. Suggesting that high hematocrit is okay is dangerous.
Seem to be a good amount of professional cyclists that have had clots and some died from. I hope someday we understand better what the relationship is.
I am just theorizing here, but I think a lot of that has to do with blood doping in general. When you ADD blood volume, it will automatically increase platelet count due to having more platelets. That is a primary risk for clotting. Combine that with a long ride and likely lower than optimal water levels due to excretion of bodily fluids through sweating, and you could compound the risk.Seem to be a good amount of professional cyclists that have had clots and some died from. I hope someday we understand better what the relationship is.
I am just theorizing here, but I think a lot of that has to do with blood doping in general. When you ADD blood volume, it will automatically increase platelet count due to having more platelets. That is a primary risk for clotting. Combine that with a long ride and likely lower than optimal water levels due to excretion of bodily fluids through sweating, and you could compound the risk.
Just spit balling here, so I could be way off the mark.
Cyclist are notorious for using EPO. Track and field too. EPO is supposed to be a game changer in endurance sports....one wrong move and you are a dead man.
So I was wondering whether EPO increased platelets and found this
Effects of erythropoietin on platelet reactivity and thrombopoiesis in humans | Blood Journal
"In summary, we showed that EPO markedly enhances platelet and endothelial activation in humans. Thus, we postulate that a patient-oriented approach to the use of EPO entails its administration not only to patients who are likely to respond to EPO but also to anemic patients, who additionally benefit from platelet activation. Whether heightened platelet reactivity and endothelial activation may increase the risk of thromboembolism warrants further investigation."
Here is another
https://www.ncbi.nlm.nih.gov/pubmed/10366799
"A 10% to 20% increase in platelet counts was observed in both EPO groups on day 5. In the placebo group, platelets increased only several days after the first phlebotomy."
So that is interesting because the vast majority of us on TRT/AAS generally do not seem to get increased platelets. So wouldn't that mean the mechanism IS different between TRT/AAS and taking EPO?? I am not sure we face the same risks those cyclists did.
In several animal species treatment with rHuEpo stimulated platelet production, but platelet counts tended to normalize after 1-2 weeks and large, chronic doses even caused thrombocytopenia.
AAS use is comparable to moderate chronic EPO stimulation, so that only moderate increases in platelet count are seen initially. And as stated above such increases in platelet count might only be temporary. Hence why we tend not to see elevated platelet counts in AAS users.In vivo data have shown that moderate Epo stimulation, i.e. that produced by standard doses of rHuEpo, short-term hypoxia or moderate iron deficiency, causes a moderate elevation of platelet counts, whereas intense Epo stimulation, as produced by high doses of rHuEpo, prolonged hypoxia or severe iron deficiency, causes some degree of thrombocytopenia. In the latter case, there appears to be a diphasic response to Epo, the initial positive response (a stimulation of platelet production) being followed by thrombocytopenia. Contrarily to the thrombocytopenia due to increased platelet destruction induced by other growth factors, Epo-induced thrombocytopenia is the result of an inhibition of platelet production.
From the study you posted:
AAS use is comparable to moderate chronic EPO stimulation, so that only moderate increases in platelet count are seen initially. And as stated above such increases in platelet count might only be temporary. Hence why we tend not to see elevated platelet counts in AAS users.
I am just theorizing here, but I think a lot of that has to do with blood doping in general. When you ADD blood volume, it will automatically increase platelet count due to having more platelets. That is a primary risk for clotting. Combine that with a long ride and likely lower than optimal water levels due to excretion of bodily fluids through sweating, and you could compound the risk.
Just spit balling here, so I could be way off the mark.
https://en.wikipedia.org/wiki/Blood_dopingBlood transfusion begins by the withdrawal of 1 to 4 units of blood (1 unit = 450 ml of blood) several weeks before competition. The blood is centrifuged, the plasma components are immediately reinfused, and the corpuscular elements, principally red blood cells (RBCs), are stored refrigerated at 4 °C or frozen at −80 °C.[11] As blood stored by refrigeration displays a steady decline in the number of RBCs, a substantial percentage, up to 40%, of the stored RBCs may not be viable.[12] The freezing process, conversely, limits the aging of the cells, allowing the storage of the blood for up to 10 years with a 10% to 15% loss of RBCs.[13] Stored RBCs are then reinfused, usually 1 to 7 days before a high-endurance event.
Could you briefly describe the 'Megalin receptor hypothesis'? Couldn't find much about it myself. Thanks!
intramuscular androgen receptor content, but neither circulating nor intramuscular hormones (or the enzymes regulating their intramuscular production), influence skeletal muscle hypertrophy following RET in previously trained young men.
Very cool stuff, thx Stewie. It's high on my reading list.Apparently they no longer exist in my bookmarks.
When Dat's board was up and accessible, there was a grad student (very brilliant young man) that went into exceptionally deep details of Megalin and Cubilin interrelationship with SHBG/internalization/diffusion of the AR. Unfortunately, that info no longer is available.
Then we have the newfound concept and I quote:
https://www.frontiersin.org/articles/10.3389/fphys.2018.01373/full
I am just theorizing here, but I think a lot of that has to do with blood doping in general. When you ADD blood volume, it will automatically increase platelet count due to having more platelets. That is a primary risk for clotting. Combine that with a long ride and likely lower than optimal water levels due to excretion of bodily fluids through sweating, and you could compound the risk.
Just spit balling here, so I could be way off the mark.