Yes, BMR varies but not by a huge amount outside of disorders, etc. I’m a practicing physician and I went to school for a very long time to learn this stuff. There are lots of misconceptions around weight and body types. 210 at 5’10” is very overweight, so the vast majority of that mass needs to be muscle to have athletic efficiency, as you say. Athletes who are 210 with 12% body fat will not fail regardless of their “body type”.
I’m not trying to deny that genetic variance with this stuff exists. I’m just saying that all the genetics do is make it easier or harder to achieve certain goals, but they do not prevent someone from achieving a goal. Anybody, and I do mean anybody, can become shredded and strong with the right diet and exercise regimen. And so success at the NHL level for a 5’10” dude really is just about ability to focus and maintain that drive to gain muscle and strength.
By the way, there’s no reason a person who is 5’10” would genetically have a harder time gaining muscle than a guy who’s 6’3”. If this was the limiting factor as you all say, we should see plenty of 6ft+ guys with the wrong “body type” fizzle out because they’re too weak, because their body types prevent them from being able maintain the necessary strength. But that doesnt happen, because it’s much more about a combination of height and weight, and really anyone can get to the requisite weight. a 5’10” guy like Crosby who is extremely strong will succeed, while a guy like hudler who never gained much strength at all will not. A guy like mantha who isn’t that strong despite his height will succeed because his height alone gives him enough leverage to manage well enough physically.
That is just not accurate. For a practicing physician who went to school for a long time, you are missing a lot of information here. Or you don't keep up with medical journals like practicing physicians should be doing. Speaking of height and weakness, look at Kevin Durant, dude is an ectomorph and there is no way he can gain weight, his body is just not built to be that way. He could be considered an anomaly in a sense because there is no way he has any real strength to speak of, but he has enough to do what his daily activity demands. No one would be able to prove to me that Durant could end up looking like Lebron (complete mesomorph) at any point in his life. It would be impossible to maintain if he was even able to do so. (god I hate basketball and i just made that reference, shoot me now)
Hormones matter and each body type has a difference in their hormone sensitivity. Cortisol levels matter a lot. I could have the same exact diet as you, same frame, same workout intensity and days of the week of working out, same job, but if I am more stressed than you because of other factors, then the possibility of not maintaining the same efficiencies that you are achieving becomes higher. Not to mention sleep is a major factor and a few others including insulin.
The aim of this study was to present the somatotype features of young individuals without any symptoms and to identify whether isokinetic knee muscle strength and dynamic balance scores are affected by somatotype difference. A total of 146 participants ...
www.ncbi.nlm.nih.gov
-This study literally studies the different somatotypes of athletes for a particular action
-Most athletes in the study, and you can argue elite athletes in general, have the endomorphic mesomorph body type (more meso than anything in leagues like NHL/NBA/NFL)
-This is the conclusion of the study if you don't want to read it like everyone should:
Conclusion
Anatomic structure of the body, which is suitable for the sports branch, has an increasing effect on performance.
I mean, if you really are a practicing physician, I commend you for being able to get through the schooling, residency, etc to get where you are, so respect on that. But if you purely believe that calories in vs. calories out is the formula to losing weight and not care about anything else, such as the different somatotypes of the human body, hormones (stress in particular), and overall REM sleep, then I really hope you are not telling or professing this information to your patients. That is just being ignorant, not understanding others, and not opening your mind to the fact that there may be knowledge and evidence that contradicts your opinions (aka close-minded). You may be someone that doesn't have overwhelming stress in your life, you work out, eat right and your physiology is great, but that is just not the case in all people.
Quick example, my brother is a Ectomorph trying to be a Endomorph. Ecto's can't gain weight efficiently because their metabolism is amazing. I am an Endomorph with Mesomorph tendencies. When my brother and I went to a Hibachi grill, he will scrape all of the food into his mouth. I will eat the protein and some rice, and he takes the rest of my food. He lifts weights, no real stress to speak of in his life, and he barely gains an ounce, and this is after eating roughly 4k calories. If that were me, I am gaining a pound and have to work harder to lose that pound than he would ever have to. It's human physiology. It is the exact same as there are some bodybuilders that have a perfect V-shape and other body builders that are just wide shoulders, thick waste.
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