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HOW DONNAY RACQUETS PREVENT ARM INJURIES: THE SCIENTIFIC EXPLANATION

The results of an independently performed “Racquet Shock & Vibration Study dramatically show that solid-core tennis frames produce less shock and vibration on initial contact and four times less shock and vibration time following contact than the racquets from the four leading brands which are all air injected and hollow.

The study was conducted by an independent third party test facility located in Shallotte, North Carolina that specializes in medical device and sport equipment testing. OrthoKinetic Technologies, LLC, the parent company, is a leading regulatory and consulting firm specializing in regulatory and test strategies for medical devices and sports equipment.

In the study, Donnay racquets dampened vibrations four times quicker with less vibratory forces than other models tested upon impact with a standardized force.

Both professional and recreational players get repetitive force transmission and vibrations to the tissues of the arm with the hits of the ball, and some of the shock is transmitted to the arm. The more prolonged the shock and vibration, the greater the risk for tissue injury.

In the study, the solid-core racquets vibrated for less than 1/5 of a second on ball contact, compared to an average of 7/10 of a second for other models tested.

That means a player hitting 180 balls in a typical tennis match is subjected to more than 111 seconds of shock & vibration dwell time with the other brands versus a mere 32 seconds with the Donnays. Having a shock needle in the tendon for 2 minutes can cause severe harm especially to children and minors whose tendons are not even fully developed.

The extent of frame vibration transmitted to the arm holding the racquet depends largely on how well it is dampened. Solid-core Xenecore construction and manufacturing process acts as a super dampener to eliminate most all of the damaging vibrations.

In the old wood rackets, vibration disappeared quickly because it was dampened by the flex of the solid wood, but the new stiffer, lighter and hollow conventional frames do a poor job of snuffing out the vibrations, so they transfer this shaking to the arm that can stealthily sabotage the elbow, wrist, forearm and shoulder.

The longer the vibration and the longer a player rallies the more the tissues are stressed. This constant stressing is how a coathanger is broken by bending it back and worth. Eventually, tissue can fatigue resulting in localized inflammation, micro tearing, and micro injuries, even without any tremendous force.

Hollow racquets with their poor dampening properties cause pain (think of hitting a baseball with the hollow aluminum baseball bat on a chilly day).

For years the tennis industry has laid the blame for arm injuries on poor stroking techniques, conveniently diverting scrutiny from the design of racquets, but hollow, stiff, ultralight head-heavy racquets are more to blame.

As conventional racquets have grown lighter and stiffer the number of players suffering from arm and elbow pain has also risen dramatically. The cause is no longer primarily related to mechanics, but rather to the equipment itself.

The study is of great significance for all players and the tennis industry as half of players are currently experiencing some form of arm pain and are looking for racquets that can minimize repeated long-term exposure to prolonged vibration and stress transfer to human tissue.

In short, if you’re trying to play hurt, you’re not playing well and you’re not having fun.

Donnay racquets filled with Xenecore is the solution that will keep you in the game, arm-injury free.