The Weight Watchers weight loss plan is designed for a safe rate of weight loss - up to two pounds per week (after the first three weeks). If you lose at a greater rate, you must review the Plan guidelines and adapt them, if necessary, to avoid rapid weight loss.
The oxygen-binding. function of myoglobin, in situ in the bundles of muscle. fibers, was abolished by chemical treatment, and the contribu-. tion of myoglobin toward the oxygen uptake of the muscle fiber. bundles was estimated from the difference in the steady state.
Six things to know about slow-twitch, or type I, muscle fibers: 1  Slow-twitch fibers contain mitochondria, the organelles that use oxygen to help create adenosine triphosphate (ATP), which is the chemical that actually fuels muscle contractions, and are considered aerobic.