HPED 2507 Lecture Notes - Lecture 11: Phosphocreatine, Lactic Acid, Vo2 Max
28 Oct 2018
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Document Summary
Understanding the role of nutrition in performance, and potential effects of ergogenic aids can be fostered by basic knowledge of how energy is formed within muscle cells. Energy substrates: glucose: from muscle and liver glycogen, triglycerides: within adipose tissue and active muscle, amino acids: to a lesser degree. Adenosine triphosphate (atp): the energy currency: energy in food funnels through atp, extracts and stores energy from food. Releases energy for biological work: body maintains a continuous atp supply. Body stores ~ 80-100g of atp (sprint for a few seconds) Energy for atp resynthesize can come from creatine phosphate (crp) Energy is for intense muscle work (70% vo2 max) Provides an immediate & limited fuel supply fuels short term explosive power activities for up to ~10 sec. another fuel source must sustain activity. Moderate physical activity glycogen consumed slowly. Both glucose and fatty acids used for energy. In the presence of oxygen, pyruvate formed in glycolysis, enters krebs cycle in the mitochondria.
