A phosphate decrement test for adolescent racket sport players

An original “phosphate decrement test” was designed by Morton (1986) to measure the average percentage deterioration in performance of a 40 m sprint when the sprint was repeated every 30 s. It was a test that purported to determine the efficiency of the alactic energy system to utilize and resynthesize the phosphagens. In this test, the 40 m sprint was repeated sixteen times.