What is the CMJ test?
What is the CMJ test?
The Countermovement Jump (CMJ) is a vertical jump test performed by having an athlete quickly squat to a self-selected depth and then jump as high as possible. It is the first jump in our force plate assessment and is used to both determine lower body power via jump height and to measure lower limb asymmetries.
How do you perform a CMJ?
With a minimum of three jumps completed, and therefore three jump height scores, an average score is then calculated. This is done by using the following equation: Average Jump Height (cm) = (jump #1 + jump #2 + jump #3) ÷ total number of jumps (i.e. 3)
What is CMJ stiffness?
1. Similar to leg stiffness during cyclic movements (such as human gait, running or hopping), leg stiffness during a single maximal counter-movement jump (CMJ) is a relatively little variable parameter.
What is CMJ and SJ?
Background: In the context of a public health physical fitness (PF) examination in adolescence, a countermovement jump (CMJ) and a squat jump (SJ) are two vertical jump (VJ) tests widely used to evaluate lower limb muscle strength and power, respectively.
What is the difference between CMJ and SJ?
It is believed that the CMJ provides an assessment of the capability to quickly produce force in stretch-shortening cycle movements, whereas the SJ provides an assessment of the capability to rapidly develop force solely during a purely concentric movement (58,86).
Why do you jump higher with countermovement?
A countermovement eliminates the vertical push-off range that is wasted in a squat jump while the muscles build up to maximum force. The jumper thus performs more work early in the upward phase of the jump, and so the jumper has a higher takeoff velocity and a greater jump height.
What is the countermovement jump (CMJ)?
What is the Countermovement Jump (CMJ)? 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).
What is the CMJ test protocol for athletes?
The CMJ test protocol for the athlete is simple: Athlete stands still to achieve a quiet phase for accurate calculation of system weight On cue, the athlete bends forward at the hip and bends the knees into a squatting position, and then instantaneously transitions to propel upwards into the air
How many jumps do I need to perform CMJ?
The athlete must perform a minimum of three jumps so that performance averages can be calculated. In most circumstances CMJ performance is reported as either jump height* (cm), or relative peak power output (W·kg -1 ).
What does the CMJ measure?
The CMJ includes both performance metrics and descriptive indicators—i.e. both how high an athlete jumped (performance) and how he or she achieved that performance (descriptive). Basically, we’re looking at the outcome of the test in addition to a “story” about the athlete’s movement pattern.
