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Leger and VAM 
The maximal multistage 20 m shuttle run test is better known under the name "test Leger" or "pick test" and requires the athlete to run shuttle (hence the name of the shuttle test) between two signals at a distance of 20 meters between them at a rate increasing progressively. There are a couple of versions of the test, but the most recently adopted a protocol in which the speed increases, of 0.5 km / h every minute. This latest version of the Leger test provides a starting velocity equal to 8.5 km / h and an increase in that of just 0.5 km / h every minute. The test ends when the athlete can no longer get on one of the two lines of demarcation at the signal, is usually tolerated to a maximum of two times in succession, a delay of 1 meter from the line of demarcation itself. The VAM is the last stretch of the athlete made in full. The problem of "shuttle test" is that the value of VAM is calculated as a bit understated compared to the value of VAM adjustable during the tests that provide a road race and not to transfer as in this case. In fact, the rapid changes of direction that takes place during the test Leger, involving as many phases of acceleration and deceleration, and greatly increase the cost of energy and thus distort, underestimated the real value of the VAM. However, since there is a strong correlation between this type of test, and the fact that football continues to change direction, "the Leger," remains one of the most reliable to find those values \u200b\u200bin athletes that will be used for the planning of subsequent repeated. The benefit of test shuttle Lèger is the extreme simplicity and ease of use, in any case, it should be noted that a key factor for the accuracy of a test to that sound, like the maximal multistage 20 m shuttle run test, is dictated by the accuracy of the sound used. Finally, remember that the MAS (maximal aerobic speed) represents the speed at which the body reaches the maximum oxygen consumption, in a nutshell then, the VAM is the speed at which our "aerobic engine reaches full speed."
The maximal multistage 20 m shuttle run test is better known under the name "test Leger" or "pick test" and requires the athlete to run shuttle (hence the name of the shuttle test) between two signals at a distance of 20 meters between them at a rate increasing progressively. There are a couple of versions of the test, but the most recently adopted a protocol in which the speed increases, of 0.5 km / h every minute. This latest version of the Leger test provides a starting velocity equal to 8.5 km / h and an increase in that of just 0.5 km / h every minute. The test ends when the athlete can no longer get on one of the two lines of demarcation at the signal, is usually tolerated to a maximum of two times in succession, a delay of 1 meter from the line of demarcation itself. The VAM is the last stretch of the athlete made in full. The problem of "shuttle test" is that the value of VAM is calculated as a bit understated compared to the value of VAM adjustable during the tests that provide a road race and not to transfer as in this case. In fact, the rapid changes of direction that takes place during the test Leger, involving as many phases of acceleration and deceleration, and greatly increase the cost of energy and thus distort, underestimated the real value of the VAM. However, since there is a strong correlation between this type of test, and the fact that football continues to change direction, "the Leger," remains one of the most reliable to find those values \u200b\u200bin athletes that will be used for the planning of subsequent repeated. The benefit of test shuttle Lèger is the extreme simplicity and ease of use, in any case, it should be noted that a key factor for the accuracy of a test to that sound, like the maximal multistage 20 m shuttle run test, is dictated by the accuracy of the sound used. Finally, remember that the MAS (maximal aerobic speed) represents the speed at which the body reaches the maximum oxygen consumption, in a nutshell then, the VAM is the speed at which our "aerobic engine reaches full speed." 
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