Energy System used During Workout

  1. Phosphagen system: When a muscle starts to contract, it quickly uses the energy released by ATP & this free moving ATP is depleted fast. The cell quickly starts to run ATP by a phosphagen system which does not last long but provides a good amount of exercise during the first few seconds of exercise. The phosphagen system is an energy reservoir that buffers ATP’s energy by use of molecules known as Creatine forming phosphocreatine.. The system is in equilibrium during rest however during intense the reaction is pushed breaking down into more phosphocreatine & producing ATP thereby providing muscles with energy.
  2. Glycolytic system: No doubt, Glycolysis is slower than phosphagen system but it is beneficial during the first period of exercise. The system consists of a chain of enzymatic reactions producing ATP from glucose which is taken from blood or through hydrolysis of glycogen which is muscle’s carb store. Besides ATP, another product of glycolysis is pyruvate which can be processed & used in the final energy system or converted into lactic acid. Lactic acid is further converted into lactate which is energy source for some other cell types
  3. Oxidative Phosphorylation: Slowest but the most efficient energy system. This provides muscle fibre with a great amount of ATP under the consumption of oxygen. This process takes place in cell compartments called mitochondria. Muscle fibres are rich in mitochondria specifically in case of slow twitch muscle fibre known for endurance workout( Genomics testing will help you identify your muscle fibre type & accordingly structure your workout schedule). This process takes place in the internal membrane of mitochondria. This is the place where oxygen, fatty acids & pyruvate come into picture. The mitochondrial membranes are charged by hydrogen ions thereby forming hydrogen potential. This enables production of ATP from ADP & inorganic phosphate( phosphorylation). In order to charge this membrane, oxygen is required & hence is referred to as oxidative phosphorylation. Besides, molecules that develop hydrogen ions are also used. These molecules are developed through a chain of chemical reactions called a Kreb cycle.Kreb Cycle does generate a few ATP molecules but also CO2 which enters our blood & leaves our lungs when we exhale.

--

--

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Sushant Kumar

Sushant Kumar

Corporate finance professional turned Health & Fitness Entrepreneur, a fitness enthusiast, adventurer & trekking enthusiast