The multi-stage fitness test, also known as the bleep test, beep test, pacer test, or shuttle run test, is used by sports coaches and trainers to estimate an athlete's VO2 max (maximum oxygen uptake). The test is especially useful for players of sports like football, hockey, rugby, or tennis.
The test involves running continuously between two points that are 20 m apart. These runs are synchronised with a pre-recorded audio tape or CD, which plays beeps at set intervals. As the test proceeds, the interval between each successive beep reduces, forcing the athlete to increase velocity over the course of the test, until it is impossible to keep in sync with the recording.
The recording is typically structured into 23 'levels', each of which lasts 60 seconds. Usually, the interval of beeps is calculated as requiring a speed at the start of 8.5 km/h, increasing by 0.5 km/h with each level. The progression from one level to the next is signalled by 3 rapid beeps. The highest level attained before failing to keep up is recorded as the score for that test. The procedure is designed to measure the maximum endurance of an individual.
This test is now used by the British Army, Royal Air Force and Royal Navy as one of the basic measures of personal fitness. It is also used in the fitness test when one applies to be a Police Community Support Officer. The minimum level required for Royal Air Force Officers is 9.2, Army officers at selection is 10.2, and Royal Marine Officers at least 11.0. The Royal Navy has no set level, however a maximal effort must be demonstrated. The test is also used by the Australian Defence Force, Canadian Forces, Australian Federal Police, Royal Canadian Mounted Police and various Australian States.
It was created by Dr.LA Leger in 1982, and was published in the European Journal of Applied Physiology.
Source http://en.wikipedia.org/wiki/Multi-stage_fitness_test