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#61
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OP Update - 3000 miles in 10 months... so Why am I still fat?
Pbwalther wrote:
Apparantly, genetics has something to do with all of this, at least in some people. The Pima Indians have the highest rates of obesity ever observed. They were skinny little guys running around the desert southwest. Their bodies were adapted to periodic famine conditions. This meant their bodies are extremely efficient at making fat and keeping it and burning fat only when it was really needed i.e. famines. The problem is that they are now exposed to a regular calorie rich diet and that obviously is not a good combination. The Pima Indians are genetically no different than any other group, and they exhibit no different resting metabolic rates: "Our present results indicate that Pima Indian children do not have gross abnormalities in energy expenditure or substrate oxidation that could account for this marked propensity for obesity. Measured RMR in these children was similar to results obtained using the gender-specific, weight-based Food and Agriculture Organization/World Health Organization equations." - Salbe et al, "Energy metabolism and physical activity - Assessing risk factors for obesity between childhood and adolescence, part 2", 08/2002 The Pimas north of the border are morbidly obese because they have embraced the American sedentary lifestyle and diet to the extreme. The ones south of the border have not, and they are still quite thin. -- terry morse Palo Alto, CA http://bike.terrymorse.com/ |
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#62
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OP Update - 3000 miles in 10 months... so Why am I still fat?
Well I was 223 in February. I am now 192. I don't even watch what I eat
Those calculators are a joke. I can ride 15mph and not even break sweat and those calcs will tell me I am burning 900 calories an hour o something for my weight Go get a heart rate monitor...train at 80%. Or do what I sometimes do go find a big hill, and go up and down it about 15-20 times. (1/4 mil or longer At any rate, I didn't read the entire thread posted here, but good luck Losing weight on a bike can be done. I'm living proof...none of m clothes fit! : - |
#63
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OP Update - 3000 miles in 10 months... so Why am I still fat?
Do you have any sources you could cite for this assertion? Please provide
some links if you can. Well Scientic American had an article quite a few years back about a "real" starvation diet. That was no food at all and for months on end. They people's metabolic rates sank to extremely low levels. Now I bet that if you test people, some folks would lower their rates in response to almost any decrease in calories ingested and other people would not. The problem here is that measuring metabolic rate is pretty tricky and it is not convenient at all. I doubt that anyone has done it. But, I think the caloric benefits of exercise vis-a-vis weight loss are overstated It depends on what you mean by overstated. I recall reading somewhere that the occupation that had the highest known rate of caloric expenditure per day was being an old manual tool lumberjack and the calories burned per day were in excess of 10,000. I have read that even modest amounts of exercise, if done without increasing calories ingested, can over time have a significant impact on body weight. The problem is that most people go out and walk a couple of miles and then have a hot fudge sundae to reward themselves and the end up worse off then before. |
#64
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OP Update - 3000 miles in 10 months... so Why am I still fat?
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#66
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OP Update - 3000 miles in 10 months... so Why am I still fat?
Badger_South wrote:
Metabolic rates seem like something that would be hard to measure A simple VO2 test, done at rest, produces a good estimate of resting metabolic rate. You can have this done at clinics around the country: http://www.korr.com/applications/indirect.htm -- terry morse Palo Alto, CA http://bike.terrymorse.com/ |
#67
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OP Update - 3000 miles in 10 months... so Why am I still fat?
On Tue, 25 May 2004 08:28:23 -0700, Terry Morse wrote:
Badger_South wrote: Metabolic rates seem like something that would be hard to measure A simple VO2 test, done at rest, produces a good estimate of resting metabolic rate. You can have this done at clinics around the country: http://www.korr.com/applications/indirect.htm Guess I should have said 'changes in metabolic rate', as in BMR. But good link. I'm learning more about VO2max, doing some reading now. Thanks! BTW, I've estimated mine at about 50-51ml.kg.min using formula in an article in the British Mag "220 Triathlon". -B |
#68
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OP Update - 3000 miles in 10 months... so Why am I still fat?
Metabolic rates seem like something that would be hard to measure, and
unless you are in a special sealed room (everything measured in and out, including watervapor, food, temp, etc.) then you might miss something when Well, you can do this with small animals. You stick a mouse into an erlenmeyer flask (wonder if I spelled that right) with a little chemical to absorb the CO2 the critter breathes out. You have a glass tube that is calibrated with water in it. And the tube is seals. As the animal breathes out C02, the C02 is absorbed and the animal has consumed 02. So the movement of water along the tube corresponds to the oxygen consumption. The problem is that if the animal is burning fat, you get a different value of calories consumption then you get if the animal is burning carbohydrate. Now to really measure metabolic rate in people, you should measure oxygen consumption and C02 consumption for your subject (or victim depending on your point of view) and even that will not be exact. I suppose you could determine how much carbohydrate, fat and protein was being burnt by using radio isotopes but I think most people would think that was a tad bit over the top. By the way, the caloric content in foods is often measured by a bomb calorimeter. You get the sample you want the caloric content of. You dry it and grind it up. You mix it with a material that you know the energy content of that will burn. The bomb calorimeter is a big old metal sphere. You put the sample inside of it. You fill the sphere with oxygen. You immerse the sphere in water. You measure the temperature of the water. You use your handy dandy little electric coil to ignite the sample (you know the caloric input from this). Then it is a simple thing to measure the change in temperature of the water bath and calculate the calories. Of course, this can give inflated results because people are not bomb calorimeters. People can not digest cellulose, for example, but a bomb calorimeter sure can. It is amazing what you can pick up poking around the right scientific laboratories. |
#69
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OP Update - 3000 miles in 10 months... so Why am I still fat?
In article ,
"Doug Cook" writes: ... I keep a ride dairy ... Maybe that's the problem :-) cheers, Tom -- -- Powered by FreeBSD Above address is just a spam midden. I'm really at: tkeats [curlicue] vcn [point] bc [point] ca |
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