The energy required for physical activity is produced by 3 sources: Aerobic, Lactic Anaerobic and Alactic Anaerobic. Each of them is characterized by a capacity (volume) and a power (flow) which make that the operating times are specific to each of them.


Aerobic: > 3′ of effort

The aerobic part represents the endurance work intensity ranges. It reflects the body’s ability to capture (breathing), carry (red blood cells + cardiac output) and use (oxidative efficiency of cells) oxygen to transform energy.


Lactic anaerobic: from 15” to 3” of effort

Arriving at 100% of the V02max, breathing is at its maximum, there is no longer enough oxygen supply to respond to the higher effort. The body therefore uses the lactic anaerobic process, which consists of helping the muscle to work properly. Except that this help is not free, it is accompanied by a supply of lactic acidity in the body that disrupts the contraction of the muscle. As a result, the muscle is experiencing increasing difficulty in functioning, the speed must be reduced, or the race stopped.


Alactic anaerobic anaerobic: < 15” of effort

Unlike lactic anaerobic, alactic anaerobic does not produce lactic acid. During intense and brief efforts, it directly degrades Adenosine triphosphate (ATP), which runs out in only 2 to 3 seconds. Creatine phosphate takes over to produce ATP. This one runs out after 10-15 seconds.

aerobic anaerboic lactic anaerobic alactic

The Prepa Physique Team

Aerobic – Anaerobic lactic – Anaerobic alactic
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Aerobic – Anaerobic lactic – Anaerobic alactic
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