Originally posted by: brikis98
Originally posted by: KoolDrew
For anybody interested in skeletal muscle and adipose tissue's effect on metabolism...
Elia (13), in his synthetic review, highlighted the existence of large between tissue/organ differences in resting metabolic rate. Heart and kidneys have the highest resting metabolic rate (440 kcal/kg per day), whereas brain (240 kcal/kg per day) and liver (200 kcal/kg per day) also have high values. In contrast, resting metabolic rates of skeletal muscle (13 kcal/kg per day) and adipose tissue (4.5 kcal/kg per day) are low. Therefore, although skeletal muscle and adipose tissue are the two largest components, their contribution to REE is smaller than that of organs. The majority of the REE of the body (approx60%) arises from organs such as liver, kidneys, heart, and brain, which account for only approx5% to 6% of BM.
That's 6 calories extra per pound of muscle. If you were to replace 2 pounds of fat with 2 pounds of muscle you wold increase your resting metabolic rate by about 8 calories a day. Even gaining 20 pounds of muscle would only increase your resting metabolic rate by about 160. Therefore, if you happened to rely primarily on gaining muscle to burn fat and happened to gain 20 pounds of it, it would still take you almost a month to lose 1 pound of fat.
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Heh, was just going to post the same thing but from a different source. It is worth noting, however, that even 160 extra calories burned per day is nothing to scoff at, as that's 32% of the caloric deficit (500) I'd recommend to the average dieter. More importantly, the exercise you'd have put in to build that kind of muscle mass burns calories, possibly increases your metabolism for short periods immediately after exercise, and has tons of other wonderful health benefits (increased strength, power, bone density, and so on). In other words, even if the muscle itself doesn't burn an enormous number of calories, there are still countless benefits to adding it.
Having said that, The Sauce is most likely a beginner, so losing 20lbs while adding a small amount of muscle mass is not impossible in the early stages. In fact, most newbies will see their waist lines shrink and their muscles grow for the first several weeks. The great tragedy is that this wonderful effect doesn't last. I have no doubt that after another month or two, either his weight loss or his muscle growth will stall, or both, and like everyone else, he'll need to work towards one goal at a time to make efficient gains.