It is different for everyone, remember that you are always using both, so i guess you mean when does the predominate system become anerobic.
It is different for everyone because we all have a different ability to get oxygen in our body, and anerobic energy production is energy production without the use of oxygen.
This will generally happen at 60% of maximal intensity but can be much higher in advanced athletes and lower in very unfit athletes. You can generally feel it when the burn kicks in.
It is a cyclical process. Aerobic exercises like cycling, running is a long duration exercises that need oxygen. Anaerobic exercises do not need oxygen. These are the short duration exercises and they produce oxygen that can be used for aerobic exercises. http://amateurwrestlingusa.com/
It uses both the aerobic and anaerobic systems extensively
Aerobic exercise
depends
Any exercise that involves breathing is classed as an aerobic metabolism.
You are more likely to get cramps during anaerobic exercise than during aerobic exercise. This is because your muscles are lacking oxygen.
Aerobic exercise. Anerobic just builds uo your muscles.
During extended exercises such as distance running, both anaerobic and aerobic energy pathways are utilized. Anaerobic pathways are primarily used during the beginning of the exercise or during bursts of intense activity, while aerobic pathways become the predominant source of energy as the exercise continues and oxygen availability increases. The transition from anaerobic to aerobic energy production helps to sustain energy output over longer durations of exercise.
aerobic and anaerobic
Actually, every exercise is at least slightly aerobic or slightly anaerobic. Aerobic exercise is exercise with oxygen, in other words, exercise that gets you breathing hard by utilizing your cardiovascular system. Running, jogging, swimming, and walking are examples of aerobic exercise. Anaerobic exercise is exercise without oxygen, in other words, exercise that does not get you breathing hard. Doing a single squat or bench press are examples of anaerobic exercise. Also, many anaerobic exercises can be made aerobic simply by doing more of them, for example, doing 50 bench presses or squats without pausing. ----
Anaerobic exercise uses about 10 times more energy than aerobic exercise, and you have more "fuel" available for aerobic exercise. Anaerobic exercise also produces lactic acid, which is what causes your muscles to burn.
Aerobic exercise requires oxygen, anaerobic exercise does not. Aerobic exercises include walking, running, swimming, and jumping rope.
Aerobic exercise can be contrasted with anaerobic exercise. The former is geared towards improving agility and short bursts of speed or power, while anaerobic exercise is for overall strength and endurance. Both types of exercise, of course, can burn calories.