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#71
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Beware of PowerCranks
Michael Press wrote:
In article .net , "Tom Kunich" cyclintom@yahoo. com wrote: I have an ex-brother in law who was the longest surviving person without a main coronary artery. Huh? How did he live at all without a main coronary artery? This sounds impossible. Bill Baka Until he got a partial heart transplant in 1999 his blood oxygen was normally 70% or less. Proof that blood oxygen is NOT the problem in climbing - rather lactac and excess CO2 is. BTW - he's still alive at about 55 years old now. No, lactate is not the problem. You should know because you posted this URL: URL:http://ajpregu.physiology.org/cgi/content/full/287/3/R502 |
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#73
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Beware of PowerCranks
Stu Fleming wrote:
Michael Press wrote: In article , Bill wrote: I don't want to make a 'me' thing out of this post Yes, you do. There's no "me" in "team". What team? I can barely find a fit grandkid to ride with. They would rather play video games. Even my friends won't ride anything with 2 wheels unless it has a 750cc (or bigger) motor. Bill Baka |
#74
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Beware of PowerCranks
On Jun 6, 9:32 pm, Bill wrote:
"Tom Kunich" cyclintom@yahoo. com wrote: I have an ex-brother in law who was the longest surviving person without a main coronary artery. Huh? How did he live at all without a main coronary artery? This sounds impossible. Kunich was not being exact with terminology (what a surprise). He was probably talking about a near complete stenosis of the left main coronary artery. The coronary arteries are asymmetric and roughly two- thirds of the heart's own blood supply goes through the left main (the other third goes via the right coronary artery which mostly supplies the back side of the heart), so when it's blocked it's A Bad Thing. |
#75
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#76
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Beware of PowerCranks
"Michael Press" wrote in message ... In article , "Phil Holman" piholmanc@yourservice wrote: wrote in message ... Phil Holman writes: Wouldn't that argument mean that if you did observe a change in VO2Max (in ml/kg/min) then the previous value was faulty and shouldn't be used as a basis for comparison? If one subscribed to that argument, both the improvement and VO2Max and the improvement in power should be discounted. It depends on the definition of VO2max. I don't see how something like this could be so fixed. Yeah, I was engaging in Socratic dialog. I don't think VO2Max is that fixed, either -- in part because of the kg vs. "lean" kg issue. OTOH, one does have to worry about how well the initial tests were done. Which sort of argues in favor of RCTs. BTW, do you ever discuss the gastric freezing debacle in your class? When I used to teach intro I used that as my cautionary tale for RCTs (I used tuberculous meningitis as my counter-example). No, and searching through some articles it looks to be very controversial. Is it universally resolved yet? For the success stories we do the Linus Pauling vitamin C to prevent colds and the largest medical experiment of all time with the Salk vaccine. It's a shock to students when they see the higher contracted numbers of polio in the placebo group. "You mean, if they had given the vaccine to everyone there would be a couple of hundred less children who contracted polio." Errrm. This whole subject reappear under new guises because people do not want to believe that there is a direct relationship between aerobic capacity and performance on a bicycle. Here we go again. I spent years reading how ankling would improve climbing and top speed and that it needed to be practiced diligently. That went away only to be replaced by other beliefs that we can fabricate power by trickery. In recent times, steam RR locomotives, although not rated in Horse Power (but rather "tractive effort", the pull at which the wheels would spin) had a conversion chart to HP based on grate area in the fire box which governs how much heat can be transferred to steam in the boiler. Grate area is closely similar to lung displacement for physically fit racers. That is what limits climbing or TT ability, not ankling, pedaling style or other external means. You continue to repeat this misconception. Lung displacement or lung capacity is not the limiting factor in climbing or TTing or cycling in general. If you understood the cause and effect elements you would understand that extreme "out of breath" is caused by excess CO2 in the blood stream as a result of lactic buffering. That is, the limits of aerobic capacity were reached upstream (cardiac output, blood muscle interface limitations etc) and no further limitations are imposed by the lungs. It wouldn't matter if you doubled lung capacity, blood lactate concentrations wouldn't change and this is the culminating event in limiting aerobic performance. Heavy breathing is an effect not a cause. As I understand it the proximate cause is mitochondrial respiration rate overload. Cellular ATP hydrolysis in excess of the mitochondrial respiration rate increases H+ in the cell. OK I'm impressed. For me its more of a notional thing. Phil H |
#77
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Beware of PowerCranks
"Michael Press" wrote in message
... No, lactate is not the problem. You should know because you posted this URL: URL:http://ajpregu.physiology.org/cgi/content/full/287/3/R502 You're right - I'd forgotten that. |
#78
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Beware of PowerCranks
"Bill" wrote in message
... Michael Press wrote: In article .net , "Tom Kunich" cyclintom@yahoo. com wrote: I have an ex-brother in law who was the longest surviving person without a main coronary artery. Huh? How did he live at all without a main coronary artery? This sounds impossible. "Sounds" is not "is". This is a known birth defect and occurs often enough that they were familiar with the condition when they shoved a catheter through the deadend of the coronary artery. In his case the minor arteries and a hole between the chambers of his heart sufficed to keep him alive though he was a blue baby. His whole life each succeeding doctor told him that he only had a couple of months to a year to live. He is now about 55 and back in the mid-90's they replaced 25% of his heart with one that had a coronary artery on it and then later they had to go in and replace the valve with a mechanical valve. And then that valve failed and they had to replace it again. He stood for the bar and passed so he knew what his rights were and managed to maintain health insurance his whole life with Kaiser. Believe me they grumbled a whole lot but they have kept him alive and he has two daughters and worked most of his life. After he had his heart repaired and his VO2 went from 70% to 99% he acted like a drunk for a couple of years until he adjusted to not having oxygen his whole life. |
#79
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Beware of PowerCranks
As Robert pointed out, I've been using the incorrect names - my
ex-brother-in-law was born WITH a coronary artery but without the AORTA believe it not. "Tom Kunich" cyclintom@yahoo. com wrote in message link.net... "Bill" wrote in message ... Michael Press wrote: In article .net , "Tom Kunich" cyclintom@yahoo. com wrote: I have an ex-brother in law who was the longest surviving person without a main coronary artery. Huh? How did he live at all without a main coronary artery? This sounds impossible. "Sounds" is not "is". This is a known birth defect and occurs often enough that they were familiar with the condition when they shoved a catheter through the deadend of the coronary artery. In his case the minor arteries and a hole between the chambers of his heart sufficed to keep him alive though he was a blue baby. His whole life each succeeding doctor told him that he only had a couple of months to a year to live. He is now about 55 and back in the mid-90's they replaced 25% of his heart with one that had a coronary artery on it and then later they had to go in and replace the valve with a mechanical valve. And then that valve failed and they had to replace it again. He stood for the bar and passed so he knew what his rights were and managed to maintain health insurance his whole life with Kaiser. Believe me they grumbled a whole lot but they have kept him alive and he has two daughters and worked most of his life. After he had his heart repaired and his VO2 went from 70% to 99% he acted like a drunk for a couple of years until he adjusted to not having oxygen his whole life. |
#80
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Beware of PowerCranks
Tom Kunich wrote:
As Robert pointed out, I've been using the incorrect names - my ex-brother-in-law was born WITH a coronary artery but without the AORTA believe it not. "Tom Kunich" cyclintom@yahoo. com wrote in message link.net... "Bill" wrote in message ... Michael Press wrote: In article .net , "Tom Kunich" cyclintom@yahoo. com wrote: I have an ex-brother in law who was the longest surviving person without a main coronary artery. Huh? How did he live at all without a main coronary artery? This sounds impossible. "Sounds" is not "is". This is a known birth defect and occurs often enough that they were familiar with the condition when they shoved a catheter through the deadend of the coronary artery. In his case the minor arteries and a hole between the chambers of his heart sufficed to keep him alive though he was a blue baby. His whole life each succeeding doctor told him that he only had a couple of months to a year to live. He is now about 55 and back in the mid-90's they replaced 25% of his heart with one that had a coronary artery on it and then later they had to go in and replace the valve with a mechanical valve. And then that valve failed and they had to replace it again. He stood for the bar and passed so he knew what his rights were and managed to maintain health insurance his whole life with Kaiser. Believe me they grumbled a whole lot but they have kept him alive and he has two daughters and worked most of his life. After he had his heart repaired and his VO2 went from 70% to 99% he acted like a drunk for a couple of years until he adjusted to not having oxygen his whole life. Kind of amazing story there. If he lived all that time and there are more like him that really does make for a survival tale. Cheers, Bill Baka |
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