The anerobic threshold (AT) is an exercise intensity at which lactate (lactic acid) starts to accumulate in the blood stream faster than it can be metabolized. Below the AT any lactate produced by the muscles is removed by the body without it building up.
The only accurate way to measure anerobic threshold is via blood samples. The AT is defined as a lactate concentration of 4 mmols (at rest it is around 1 mmol). There are ways of estimating AT based on heart rate but these can be very inaccurate.
A person's anerobic threshold can be improved by exercising, however the threshold will never exceed the person's VO2max - the point at which the body cannot supply any more oxygen to the muscles. The relation between the two is reliant on the amount of training _ an untrained individual's AT is approximately 55% of VO2max, but elite endurance athletes are about 80_90% of VO2max.
Anaerobic exercise comprises brief, strength-based activities, such as sprinting or bodybuilding, whereas aerobic exercise is centered around endurance activities, such as marathon running or long-distance cycling.
Anaerobic means "without air", and refers to the energy exchange in living tissue that is independent of oxygen.
Although the anaerobicthreshold is defined as the point when lactic acid starts to accumulate, some testers approximate this by using the point at which lactate reaches a concentration of 4 mM/L (at rest it is around 1 mM/L)....
Anaerobic metabolism is sort of an emergency form of energy production that your body uses when is isn't able to take in and utilize sufficient oxygen to meet current demands.
The exercise intensity at which you begin to switch over from aerobic to anaerobic metabolism is called the "anaerobicthreshold." At this point your rate of breathing increases significantly as several physiological parameters change due to a lack of oxygen in the working muscle cells.
Your anaerobicthreshold is improved by any type of aerobic exercise, such as walking, jogging, cycling, aerobic dance, stair climbing, etc. The more time and intensity you add, the greater the effect on your anaerobicthreshold.
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