Scientific Evidence Proves Less Shock from Solid Core Racquets

NEW YORK, May 06, 2014 — As seen in a recent NY Times article, published on April 28, 2014 by Ben Rothenberg, wrist injuries are now overtaking tennis elbow. Ben cites Dr. Richard Berger an orthopedic surgeon at the Mayo Clinic in Rochester, Minn., “….Tennis is one of those sports that, honestly, the wrist is one of the structures at most risk because the force of contact with the ball is transmitted directly through the wrist….”

It is already well documented that half of all tennis players will develop an arm injury in their lifetime. Found here is more information about the arm injury epidemic, as 34 of the top 40 players have retired from 117 matches from an arm injury.

Independent scientific studies have been done on hollow “air molded” racquets and dual core and triple core racquets, showing that less shock is transmitted with the dual core and triple core racquets.  The full study shows that a child in an intensive training program will receive at least 400,000 lbs of force in the arm by using hollow racquets, in which most consumers are unaware that these racquets are hollow, and will eventually incur permanent injury requiring surgery.

According to Dr. Joshua Dines, an orthopaedic surgeon specializing in Sports Medicine at New York’s Hospital for Special Surgery and former team doctor for the U.S. Davis Cup team, “If shock and stress is reduced by three times, the likelihood of injury is exponentially less because you are playing well below the injury threshold and there is faster recovery during off times.”

All The Zing Without The Sting

Scientific research study proves that high-performance solid-core tennis racquets dramatically reduce harmful shock and vibrations that can lead to arm injuries.

NEW YORK, April 25, 2014 — High-performance multi-layered solid core tennis racquets won “hands-down” over conventional hollow racquets in a recently published scientific study that measured the effectiveness of the two designs in dampening shock and vibration and reducing the harmful energy transmitted on ball contact that can cause wrist, arm, elbow and shoulder injuries.

Three dual-core and two triple core frames that are exclusively designed and manufactured by the Xenecore and Donnay brands were tested against five hollow-core racquets from the leading manufacturers in the study published by Elsevier Ltd., a global academic publisher of medical and scientific literature.

“Overall, the dual and triple core designs demonstrated significantly lower shock forces and vibratory forces and dampened vibration quicker than the hollow designs,” reported the authors from OrthoKinetic Technologies. LLC of Southport NC, which conducted the test using an ISO17025 certified third-party independent test facility and a team of highly qualified mechanical and biomechanical engineers.

The dual and triple core designs successfully dampened the oscillations (the pendulum-like back-and-forth movement of the vibrations after impact) by at least 35% for the dual core and 50% for the triple core compared to the hollow frames, according to the study. The range of vibration dampening time in all models tested was from two-tenths of a second for a triple-core frame to .8 seconds for one of the hollow frames.

Additionally the authors reported that the amplitudes (the greater the amplitude the more energy it transmits) during oscillations following the initial shock impulse force for the core-handle design resulted in a reduction of shock force “by at least 65%” compared to 22% for the hollow frames.

It is well documented that the long-term repetitive impact on the upper extremities in tennis can increase the risk of tissue fatigue and injury, leading to inflammation of the tendons and soft tissue in the wrist, elbows and shoulders and small stress fractures and chronic degeneration of the surrounding soft tissues from small tears that were incompletely healed.

“The solid-core racquets help players avoid arm injuries because the tendons in their elbows, forearms and shoulders are seeing less stress,” said Dr. Joshua Dines, an orthopaedic surgeon specializing in Sports Medicine at New York’s Hospital for Special Surgery and former team doctor for the U.S. Davis Cup team.
“I think in addition to using proper technique and avoiding overuse, solid-core racquets provide a huge potential safety benefit for recreational players.”

The purpose behind the study is that there is little that has been written and documented about the effects of racquet frame design on the extremities compared to volumes on how poor player mechanics and even how tight and harsh string can result in increasing stress transfer and vibration from the racquet to the player.

“Poor stroking technique is frequently accused, conveniently diverting scrutiny from racquet design, but, as the calculations on this site prove, risk factors for tennis elbow include: (1) light racquet weight and (2) head-heavy balance. Stiff frames are also bad,” according to RacquetResearch.com.

The International Tennis Federation (ITF), the global governing body of the sport, reported in the British Journal of Sports Medicine in 2006 that “the combination of the increased stiffness of modern rackets and the tendency for tennis balls to have become harder has led to an increased shock transmission from the racket to the player, which is probably a major contributor to tennis elbow.” The ITF also states that about half of recreational tennis players will suffer at least one bout with tennis elbow during their playing lifetimes.

This epidemic wasn’t the case when all tennis racquets were made from flexible solid-core wood. Vibration on ball contact disappeared quickly because it was dampened by the flexibility of the solid wood. But they weighed as much as 16 ounces, making them difficult to maneuver, especially for smaller and less accomplished recreational players.

However, with the advent of new carbon materials racquet manufacturers were able to reduce weight by making the frames hollow and compensate for the weight loss with much stiffer frames that were much more powerful than the flexible wood frames.

But while the lighter and stiffer racquets have made the game more accessible for recreational players, some critics say it has gone too far. Tennis legend Martina Navratilova, for one, complained that modern composite racquets have “added too much power and have put enormous wear and tear on young bodies” in an article titled “Sidelined in their Prime” that appeared in the Jan. 9, 2009 edition of Newsweek.

“More injuries are likely,” she sternly warned, “unless tennis’s governing bodies modify the [large numbers of tournaments on the] calendar and fight back against the racquet manufacturers that have hijacked the game.”

“The study shows that hollow rackets transmit 45,000 pounds of force per match and kids in intensive training programs hitting 2,000 balls a day means 400,000 pounds of force is transmitted to the arm with hollow racquets,” said Jerry Choe, CEO of Xene Corporation that designs and manufactures the Donnay and Xenecore racquet brands. “After six straight months of 6 hour days, they will need surgery.

The Xenecore material and process results in the manufacture of solid frames that achieve the highest strength-to-weight ratio in the industry,” added Choe.

As a result, the Xenecore and Donnay racquets match hollow racquets’ power potential in a flexible frame like the old wood racquets but without the weight. “It’s what we call ‘arm-safe performance,”’ Choe said, “all the zing but without the sting.”

Other racquet companies fill a few of their models with a solid core substance for their sponsored tour professionals and high-level tournament players but the substance (usually polyurethane) makes the racquet too heavy for recreational players.

Xenecore and Donnay are the perfect balance for modern tennis of high performance and no risk,” says Choe.

“It’s not just a claim or a slogan,” he adds. “We’re so confident that we’re guaranteeing players won’t suffer an upper extremity injury while using a Xenecore or Donnay racquet. If they do – even if it’s a wrist, arm, elbow or shoulder injury from improper stroke mechanics, they can choose to return it for a full refund with a note from the attending physician about the injury.”

(To see the full study entitled “A mechanical study on tennis racquets to investigate design factors that contribute to reduced stress and improved vibrational dampening,” go to http://www.sciencedirect.com/science/article/pii/S1877705813010667 and click on the “download the PDF” in the upper left-hand corner.)

Donnay and Xenecore designs, manufactures, and distributes premium tennis equipment, apparel, and accessories under the Donnay brand. The technologically advanced and innovative new X-P Dual, X-Dual and Formula and Pro One racquets developed using XēneCore™ Technology represent the return of Donnay to the global market. Headquartered in New York City, the company’s products can be found in tennis specialty shops as well as online.

Donnay’s New Social Media Platforms (XeneCore Tennis)

Donnay can now be found on its new social media platforms:

With the release of the new 2014 XeneCore racquet line, we have moved our social media platforms to our new XeneCore Tennis pages.

Follow us at the following pages:

SaveInTown: http://www.saveintown.com/savefile.php?id=1771
Facebook: http://www.facebook.com/pages/XeneCore-Tennis/1391235354432307
Twitter: http://www.twitter.com/xenecoretennis
YouTube: http://www.youtube.com/user/xenecoretennis

XeneCore 2014 Racquet Line Now Available

XENECORE, Inc., the Next Generation Racquet Technology company, has just announced the production of it’s own Branded Tennis Racquet line for Spring 2014.

XENECORE, Inc. was founded in 2007 and developed it’s “Solid Core” Technology to address the Arm Injury Epidemic (Shoulder, Elbow, Wrist) that inflicts so many current Tennis Pros and Recreational Players.  Arm Shock from repetitive racquet/ball contact with Empty, Hollow Core frames is the leading factor to arm injury cases.  XENECORE Technology, combined with it’s Dual Core System (multiple cores within the hoop of each frame), are credited with substantially reducing shock while increasing power and performance.  Since 2010, XENECORE, Inc. has been “Powering” the iconic DONNAY brand frames with “Arm Safe Performance”.  Now, XENECORE, Inc. will produce it’s own branded frames with it’s own proven technology with the X-Dual, XP Dual, Pro One and Formula Family of Models.

“Our message to our customers, dealers and industry leaders is very simple.  XENECORE Technology is the key to manufacturing the Safest High Performance Racquet in the World! Since we first released our technology into Donnay racquets in 2010, it has been our mission to improve playability while protecting our customers from serious arm, wrist and shoulder injuries.  For these reasons we are proud to present our new Spring 2014 line as Xenecore technology will continue to revolutionize the game of tennis for years to come, taking performance to the next level while keeping players healthy.” – Jerry Choe, CEO/Founder of Xenecore, Inc.