![]() If the arm-swing is prohibited, then the athletes must keep their hands on the hips throughout the test. contact mat, force plate, infrared platform, accelerometer, or a video camera).Īrm-Swing: The test administrator must decide before testing whether to include or eliminate the use of the arm-swing, as it is important to understand that the arm-swing can improve performance by 10% or more (5). The test configuration for the CMJ will differ depending on what measuring device is being used (e.g. Relevant calculations (see section ‘calculating CMJ performance’).One of the following: Contact mat, force platform, linear position transducer, high-speed video camera and software, or an infrared platform.Reliable and consistent testing facility (e.g.If the environment is not consistent, the reliability of repeated tests at later dates can be substantially hindered and result in worthless data.īefore the start of the test, it is important to ensure you have the following items: facility), so that it is protected from varying weather types, and with a dependable surface that is not effected by wet or slippery conditions. It is important to understand that whenever fitness testing is performed, it must be done so in a consistent environment (e.g. Interestingly however, one recent study has demonstrated that CMJ can be accurately measured using a relatively inexpensive high-speed camera (Casio Exilim FH-25 camera) and the KineJump software (20). The present issue with measuring the CMJ is the cost and impracticality of some of the aforementioned equipment. The CMJ has been measured using contact mats (4, 10-13), force platforms (4, 11, 14-16), infrared platforms (15, 17, 18), accelerometers or linear position transducers (13, 19) and even video analysis (4, 12, 16, 20), though force platforms are often considered as the ‘gold-standard’ for test accuracy. Performing the CMJ with an arm-swing action has shown to increase performance by 10% or more (5-9). This test can be conducted either with, or without the use of the arm-swing. The countermovement jump (CMJ) is primarily used to measure an athlete’s explosive lower-body power (2, 3), and has become one of the most frequently used tests by coaches and researchers to indirectly measure power in the lower limbs (4). Keywords: power, vertical jump, CMJ, arm-swing This test is not to be confused with the Abalakov Jump test, or any of the Jump-and-Reach tests such as the Sargent Jump test, the Vertical Power Jump, or the Vertical Jump test (i.e. Contact mats, force platforms, accelerometers, high-speed cameras, and infrared platforms have all been shown to provide a valid and reliable measure of CMJ performance – though force platforms are considered as the ‘gold-standard’. When the CMJ is performed using the arm-swing, performances can be ≥10% higher than when they include no arm-swing. This suggests that performances in the CMJ are linked with maximal speed, maximal strength, and explosive-strength. Furthermore, the CMJ has been shown to have relationships with sprint performances, 1RM maximal strength, and explosive-strength tests. The CMJ has been shown to be the most reliable measure of lower-body power compared to other jump tests. ![]() As a consequence, it is no surprise that this has become a cornerstone test for many strength and conditioning coaches and sports scientists. The countermovement jump (CMJ) is a simple, practical, valid, and very reliable measure of lower-body power. ![]()
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