Detail explaination about the theory Quote from here http://www.runtheplanet.com/trainingracing/marathon/physiology.asp Energy Sources
Energy to perform work comes from the generation of a substance called ATP, (adenosine triphosphate). The breakdown of the food provides the sources of this energy. The main energy sources used in endurance running are carbohydrates, (stored in the body as glycogen), and fat. When these materials are broken down in the presence of oxygen, the metabolism or energy used is termed aerobic. The waste products of this aerobic metabolism are water (H20) and carbon dioxide (CO2). Metabolism is termed anaerobic when the glycogen is broken down to form pyruvate and, lacking oxygen, further breaks down into lactic acid.
Continuce ... The body can endure only limited amounts of lactic acid. If lactic acid accumulates, fatigue occurs faster and glycogen breaks down rapidly, depleting your energy source . Anaerobic metabolism provides energy for short intense exercise such as sprinting or for bursts of speed in sports like soccer and basketball. In prolonged exercise, the major metabolic pathway used is the aerobic one. When aerobic metabolism cannot meet the requirements for energy due to either increased intensity or prolonged time, anaerobic metabolism may be called in for short term assistance.
Carbohydrates are the most readily available source of energy in the muscle and are utilized mainly in faster continuous running, especially for shorter distances. Fat is the major supplier of energy at slower paces or for longer distances. More oxygen is required to produce an equal amount of energy when fat rather than glycogen is used as the energy source. In addition fat requires some breakdown of carbohydrates to be taking place simultaneously. The body can not accumulate adequate glycogen stores to provide enough energy for the duration of the marathon. Many marathoners have experienced a severe energy loss around the 20 mile point in a marathon. The effect is referred to affectionately as "Hitting the Wall". Hitting the wall is thought to be the depletion of muscle glycogen. Fat stores (even in the leanest runners) are almost inexhaustible. However, when muscle glycogen is gone, fat is probably unable to be used because it needs some carbohydrate as a primer for its metabolism. Besides, Thx for your key
It is difficult to explain by my writing skill , even translate into chinese. Moreover, I am a limited company in term of english. Don't exposure my weakness to public la. Really, i told you some concept as before by conversation which was based on this. I concluded by the past knowledge not only reply on it , but also main idea came from it. Also , I like to discuss with you if you interest. Besides, I perfer you to consult tung co in detail because of passing some info to him that i felt treasurable.
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回覆刪除又借借位一用 , sorry To ming co, http://www.mcmillanrunning.com/training1.htm
回覆刪除我次次到屯門運動場都見到超哥練跑
回覆刪除請問那位會跑在大尾督舉行的10.1國慶跑
回覆刪除村妹
回覆刪除彈下彈下果位叫 clerkb , not me
回覆刪除Detail explaination about the theory Quote from here
回覆刪除http://www.runtheplanet.com/trainingracing/marathon/physiology.asp Energy Sources
Energy to perform work comes from the generation of a substance called
ATP, (adenosine triphosphate). The breakdown of the food provides the
sources of this energy. The main energy sources used in endurance
running are carbohydrates, (stored in the body as glycogen), and fat.
When these materials are broken down in the presence of oxygen, the
metabolism or energy used is termed aerobic. The waste products of this
aerobic metabolism are water (H20) and carbon dioxide (CO2). Metabolism
is termed anaerobic when the glycogen is broken down to form pyruvate
and, lacking oxygen, further breaks down into lactic acid.
Continuce ...
回覆刪除The body can endure only limited amounts of lactic acid. If lactic acid
accumulates, fatigue occurs faster and glycogen breaks down rapidly,
depleting your energy source . Anaerobic metabolism provides energy for
short intense exercise such as sprinting or for bursts of speed in
sports like soccer and basketball. In prolonged exercise, the major
metabolic pathway used is the aerobic one. When aerobic metabolism
cannot meet the requirements for energy due to either increased
intensity or prolonged time, anaerobic metabolism may be called in for
short term assistance.
Carbohydrates are the most readily available source of energy in the
muscle and are utilized mainly in faster continuous running, especially
for shorter distances. Fat is the major supplier of energy at slower
paces or for longer distances. More oxygen is required to produce an
equal amount of energy when fat rather than glycogen is used as the
energy source. In addition fat requires some breakdown of carbohydrates
to be taking place simultaneously. The body can not accumulate adequate
glycogen stores to provide enough energy for the duration of the
marathon. Many marathoners have experienced a severe energy loss around
the 20 mile point in a marathon. The effect is referred to
affectionately as "Hitting the Wall". Hitting the wall is thought to be
the depletion of muscle glycogen. Fat stores (even in the leanest
runners) are almost inexhaustible. However, when muscle glycogen is
gone, fat is probably unable to be used because it needs some
carbohydrate as a primer for its metabolism. Besides, Thx for your key
Hi Clerkb, thanks for your elaborate explanation, the article is useful. I appreciate that If you could translate it into Chinese. Won't you?
回覆刪除It is difficult to explain by my writing skill , even translate into chinese. Moreover, I am a limited company in term of english. Don't exposure my weakness to public la. Really, i told you some concept as before by conversation which was based on this. I concluded by the past knowledge not only reply on it , but also main idea came from it. Also , I like to discuss with you if you interest. Besides, I perfer you to consult tung co in detail because of passing some info to him that i felt treasurable.
回覆刪除