P.E WORK

Metabolism: refers to the processes your body uses to break down nutrients, form compounds the cells can use for energy and use those compounds to fuel cellular functions. Your body secretes enzymes to break down food into sugars, proteins, and fats. Then each cell of your body can take these in and use them in aerobic or anaerobic metabolic processes to form adenosine triphosphate (ATP) which is the fuel used in the cell. 

The calories from food are burned in this way to produce energy in each cell. Your body's overall metabolism includes muscle contraction, breathing, blood circulation, maintaining body temperature, digesting food, eliminating wastes, and the functions of the brain and nervous system. The rate at which you burn calories is called your metabolic rate.

Anaerobic metabolism: is the creation of energy through the combustion of carbohydrates in the absence of oxygen. This occurs when your lungs cannot put enough oxygen into the bloodstream to keep up with the demands of your muscles for energy. It generally is used only for short bursts of activity, such as when you go for a sprint when running or cycling or when you are lifting heavy weights.When there isn't enough oxygen in the bloodstream, glucose and glycogen cannot be fully broken down to carbon dioxide and water. Instead, lactic acid is produced, which can build up in the muscles and degrade muscle function.

Aerobic metabolism: is the way your body creates energy through the combustion of carbohydrates, amino acids, and fats in the presence of oxygen. Combustion means burning, which is why this is called burning sugars, fats, and proteins for energy. Aerobic metabolism is used for the sustained production of energy for exercise and other body functions. Examples of exercises that use aerobic metabolism include walking, running, or cycling with sustained effort.

Here are the differences between anaerobic and aerobic metabolism:

-Aerobic respiration is the respiration which takes place in the presence of oxygen.

-The end products of aerobic respiration are carbon dioxide and water. 

-The amount of energy released in aerobic respiration is very high.

-Anaerobic respiration is the respiration which takes place in the absence of oxygen.

-The end products of anaerobic respiration are carbon dioxide and ethanol or lactic acid.

-Anaerobic respiration helps in fermentation of yeast to produce ethyl alcohol or ethanol in beverage industry.

Here are a few useful facts about how anaerobic metabolism affects your body during exercise:

-Weight lifting and other strength exercises use anaerobic metabolism when providing strenuous effort in a short period of time.

-When running or cycling very fast your body turns to anaerobic metabolism to get enough energy.

-Sprinters' muscles use anaerobic metabolism to fuel their muscles during their short burst of speed.

-Anaerobic metabolism produces lactic acid, which can build up in the muscles to the point where you "feel the burn." This burning sensation is a normal side effect of anaerobic metabolism.

-Fast twitch muscle fibers rely more on anaerobic metabolism for quick contractions, but they fatigue more quickly as well.

-With high-intensity intervals, you can turn a normally aerobic exercise like endurance running into an anaerobic exercise as anaerobic metabolism is needed once you exceed 90 percent of maximum heart rate.