Kinesiology 2230A/B Lecture Notes - Lecture 10: Pyruvic Acid, Myoglobin, Lactate Threshold
28 Feb 2016
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Energy: g, cho and fats - vo2 , mass, and kcals. Energy systems: atp-pcr, an/aerobic glycolysis , fat oxidation, regulation and control. Under cellular conditions lactic acid loses an h+ and forms lactate. Lactic acid if formed immediately from pyruvic acid. Upon formation of lactic acid in the skeletal muscle cell ,the hydrogen dissociates and we end up with lactate and hydrogen. **** percentages are not critical to know the order is **** If you are immobile, the concentrations will decrease over time ** If you are active, lactate concentrations will decrease much faster ** Slow twitch fibers using lactate as substrate/fuel for low intensity exercise. Heart tissue use lactate as substrate/fuel to give us energy. Key point: slow twitch fibers and heart tissue metabolizing the lactate aerobically. You recover faster if you are active. Lactate transporters that will move lactate from cytosol into mitochondria. Once in mitochondria, there is lactate forming pyruvate.
