Out fishing with Annie on his lap, a cigar in one hand and a ginger ale in the other, watching the sunset.
Join Date: Mar 2006
Location: South Florida
Bikes: Techna Wheelchair and a Sun EZ 3 Recumbent Trike
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You're getting into the aerobic vs anaerobic debate.
Aerobic= lower HR and long period of activity at a lower caloric burn, but a greater % of that burn is from fat stores rather than protein.
Anaerobic= High Intensity, with a greater portion of the energy provided from protein burn.
How Cellular Metabolsism works
These both start occurring after you switch from the carb/sugar burn in the Kreb Cycle to the anaerobic cycle where you get your energy from fat and protein breakdown. The anaerobic cycle does provide 5X the energy that the Kreb cycle does, but it's a slower process to initiate. Both cycles produce a compound called ATP (Adenotriphosphate) and this powers the muscles.
When you are exercising over a longer period, at lower intensity, there is less stress on the muscle tissue, consequently less muscle breakdown. The body will pull a greater amount of it's energy from the fat, but not all of it to produce ATP and Glucose from your bodies reserves.
When you go high intensity and are operating at or near Max HR, your body thinks it's in crisis mode and it doesn't care where it gets it's energy short term, so it goes for protein because it's easier to break down than fat. It thinks it's in survival mode because you are running away from a predator, in effect, or are the predator yourself and need that burst to acquire nutrients. One of the side effects of this is during the repair process, the body concentrates on rebuilding your fast twitch muscle tissue first instead of Slow twitch.
As to which is which? On a chicken, the fast twitch muscle is the white meat and the slow twitch is the dark. Fast twitch is for explosive bursts of activity, and slow twitch is for the all day grind.
I mix it up activity wise to develop and maintain both.
. “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche
"We can judge the heart of a man by his treatment of animals." - Immanuel Kant