What is a good countermovement jump height?
Very good: 20-24 in. (51-60 cm) Above average: 16-20 in. (41-50 cm)
What does a countermovement jump measure?
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). This test can be conducted either with, or without the use of the arm-swing.
What is the difference between a countermovement jump and a squat jump?
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 in countermovement jump?
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 a countermovement?
1 : a movement in an opposite direction She observed that whenever the body abruptly moves one way, there is a fallout of countermovements and readjustments …—
Why is countermovement jump better than squat jump?
The greater jump height in CMJ was attributed to the fact that the countermovement allowed the subjects to attain greater joint moments at the start of push-off. As a consequence, joint moments were greater over the first part of the range of joint extension in CMJ, so that more work could be produced than in SJ.
Is a countermovement jump the same as a vertical jump?
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.
What is a non countermovement jump?
non-countermovement jump (NCMJ), (often referred to as a squat. jump or static jump). While this point is not disputed by. researchers, there is much debate on the neuromuscular and. mechanical mechanism(s).
How many phases do you think is ideal to break down the countermovement vertical jump?
This article describes how six key phases of the CMJ (weighing, unweighting, braking, propulsion, flight, and landing) can be derived from force-time records to facilitate researchers' and practitioners' understanding and application to their own practice.
What muscles are used in countermovement jump?
Muscle activity in the COD and countermovement jumps was only distinguished by a higher peak muscle activity for the adductor longus, semitendinosus and biceps femoris in the COD to stabilize the hip and decelerate knee joint movements when turning compared with the jumps.
What is a countermovement jump Google Scholar?
Countermovement jumps (CMJs) are widely used in athlete training, performance monitoring and research as an indicator of power output. Despite extensive scientific research on CMJs, data for elite track and field athletes is limited, particularly for non-sprint events and female athletes.
Why We Do it this Way
A CMJ can be performed with the athlete’s natural arm swing or with hands placed on hips. We use hands on hips because every athlete can generate a different amount of power from their arm swing, making comparison between athletes less reliable with an arm swing [1].
Measuring the Jump
When it comes to measuring jump performance on a dual force plate system, the most common strategies are to estimate jump height using either flight time or using a calculation based on the athlete’s change in momentum (imMotus) to estimate their center of mass displacement.
Lower-Limb Asymmetries
Monitoring asymmetries in lower limbs is another application of the CMJ.
Athlete Asymmetry Context
Athlete 1: Has a tight right hip from a previous injury, causing them to have trouble squatting into their right side, resulting in them favoring their left side in the eccentric portion of the jump.
Data Interpretation
When it comes to interpreting an athlete’s force plate assessment data for the CMJ, we start by looking at the outcome measures—jump height and asymmetries in various phases of the jump.
How We Use the Data
After an athlete completes their force plate assessment, we use the data from their CMJ, squat jump, hop test, and isometric mid-thigh pull together to determine their strength program needs.
What is a countermovement jump?
The countermovement jump, also known as CMJ is a jump that involves a countermovement. Hence why the name of the jump is “countermovement” jump. It is the jump that you typically think of when you think of a vertical jump assessment. A countermovement at its most simplest form is a downward action followed by a reciprocal upward action.
What phase of the pre-jump is the vertical jump?
isometric or amortization phase) before beginning the concentric muscle actions (e.g. propulsive phase) that produce the vertical jump.
Why is the CMJ higher?
As mentioned above, the majority of the time the CMJ height will be higher. This is because the CMJ harnesses the capabilities of the powerful stretch reflex, also known as the stretch-shortening cycle (SSC). The SSC uses the qualities of the contractile component (e.g.
What is the difference between CMJ and SJ?
The CMJ and SJ are both useful for assessing athletic performance. The two jumps can be used for readiness (i.e. determining the current state of your athletes), as well as a before and after training assessment. The CMJ is more of an assessment that looks at the ability to effectively transfer energy into a jump.
Is CMJ higher than SJ?
For example, a very strong athlete with poor ability to effectively transfer energy may yield a SJ that is higher than the CMJ.
How does a vertical jump work?
Immediately after, the vertical jump begins by an explosive extension of the legs. The elbows flex and the hands go up to the height of the face. The shoulders and elbows would be locked in place when the maximum height of the jump has been achieved.
How to do a reactive jump?
There is some flexion of the knees, but the idea is communicating the performance of a reactive jump. Then, jump progressively higher during 5 or 6 seconds to achieve 2 or 3 maximum height jumps.
What is standing vertical jump?
The standing vertical jump is a popular test of leg power and it is routinely used to monitor the effectiveness of an athlete's conditioning program. In most tests the athlete is asked to perform a 'countermovement jump' (with armswing) for maximum height. A countermovement jump is where the jumper starts from an upright standing position, ...
Why is the jumper's leg muscles higher at the start of the upward phase?
In a countermovement jump the levels of activation in the jumper’s leg muscles are higher at the start of the upward phase because the jumper has to slow and then reverse the initial downward motion. A countermovement eliminates the vertical push-off range that is wasted in a squat jump while the muscles build up to maximum force. ...
Why did Michael Jackson choose to do a squat jump?
He chose to use a squat jump because he was unfamiliar with the countermovement jump, and it was suspected that he could improve his jump score even more if he learned to jump using a countermovement. This highlighted an important consideration in obtaining valid results in athlete testing.
Abstract and Figures
It is well established in literature, that the use of a countermovement jump (CMJ) will result in a higher vertical jump, when compared to a non-countermovement jump (NCMJ), (often referred to as a squat jump or static jump).15,26 While this point is not disputed by researchers, there is much debate on the neuromuscular and mechanical mechanism (s).
References (29)
ResearchGate has not been able to resolve any citations for this publication.
