Simply put, the more muscle mass you have, the more energy your body has to spend to move that muscle mass, and the quicker you run out of gas. That's the biggest difference. Also, fat reserves make a slight difference. Roy has almost no fat reserves, and your body will burn fat for energy over an extended and strenuous physical exertion like a boxing match after it runs out of the glycogen stored in your muscles.
And that's only part of it. Lungs, heart, vascular system all have to be in perfect condition. I think Roy is probably in about the best condition he can be in, but it's not at quite the same level as Joe has been in the past, and is capable of. How he shows up on fight night is the only thing that's in question, and I don't see any reason he'd change what's worked for him so far.
A good way to tell what kind of condition someone is in is to check their resting heart rate, have them sprint for 45 seconds, check it then, then exactly 1 minute later, and see how much it raises, and how close it gets back to resting after that minute rest.
My resting heart rate, when I was 20 years old, was 44 bpm, and was back to 59 after a minute rest following a 45 second sprint. I'm guessing Joe's is at least that good, maybe better.
And that's only part of it. Lungs, heart, vascular system all have to be in perfect condition. I think Roy is probably in about the best condition he can be in, but it's not at quite the same level as Joe has been in the past, and is capable of. How he shows up on fight night is the only thing that's in question, and I don't see any reason he'd change what's worked for him so far.
A good way to tell what kind of condition someone is in is to check their resting heart rate, have them sprint for 45 seconds, check it then, then exactly 1 minute later, and see how much it raises, and how close it gets back to resting after that minute rest.
My resting heart rate, when I was 20 years old, was 44 bpm, and was back to 59 after a minute rest following a 45 second sprint. I'm guessing Joe's is at least that good, maybe better.
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