| [ healthNdiet ] in KIDS 글 쓴 이(By): guest (guest) <211.206.4.151> 날 짜 (Date): 2002년 9월 9일 월요일 오후 10시 32분 16초 제 목(Title): Re: 제가 아는 운동 상식 몇가지 1번에 대한 답은 http://www.totalefit.co.uk/zref_fuelutilisation.asp 2번에 대한 답(?)은 위 링크 내용을 보시면 자연히 아실 것으로 사료됨. 1번에 대해 첨언하자면 carlisle-www.army.mil/apfri/april.htm 에 있는 다음 내용으로 몇개의 운동에 대해 탄수화물과 지방의 소비 비를 예시하고 있음. The mode, intensity and duration of any exercise bout will determine what energy system is engaged the most to produce the required energy from existing fuel sources, e.g. fat or carbohydrates.2 The terms aerobic and anaerobic are simply words to describe a type of energy production. Respectively, they mean "with" and "without" oxygen. But these terms also describe the preference of fuel, or the combination of fats and carbohydrates metabolized, for combustion and energy production. Let’s set the record straight by stating, no form of exercise is strictly aerobic or anaerobic in nature, or only fat burning or carbohydrate burning! Example At rest, each calorie used to sustain various metabolic functions comes from both fat and carbohydrate being metabolized. In an average person, a combination of about 60% fat and 40% carbohydrate are used for each calorie of energy that is expended to meet the body's resting energy needs. While sitting and reading your favorite book, for instance, you don’t need much energy and plenty of oxygen is available. During the first few minutes of exercise, the fuel ratio changes to more than 80% carbohydrates and less than 20% fats. At this point, the body is attempting to reach steady state, which takes about 2-5 minutes in the average person, provided exercise intensity remains the same. Once at steady state exercise, the heart and lungs "catch-up" and an increased portion of calories are derived from fat stores. The energy cost of walking is relatively low, for instance, when compared to jogging because of slower speeds, however, when walking at speeds of five miles per hour or faster, the caloric cost per minute of walking approaches that of jogging. Remember, the ultimate percentage of calories from fat stores is solely dependent on the intensity of exercise. |