Weight training does not necessarily consume more calories or energy from the muscle, but it consumes it at a much faster rate per minute. The problem is the byproduct of this is lactic acid, upsets the ph balance of the bloodstream and shuts down the body in selfdefense. So aerobic exercise does consume energy at a slower rate, but is able to be sustained longer.
Weight training does work more effectively with glucose and carbs. Normal weight training and diet is all carb consumption while exercising. Aerobic exercise blends together fat and carbs for energy. The harder you do aerobics, the more the proportion shifts to carb consumption. If you burn up your limited supply of carbs with aerobics, your weight training workouts will suffer. If you weight train first, you can still do aerobics, albeit at a slower, more fat consuming pace.
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