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.

Donnay Formula OS EXT – Best For Tennis Elbow (Men’s Journal)

Men’s Journal writes, “Most racquets are hollow but this 9.9-ounce model is injected with tubing to product a light, shock-absorbing, solid-core frame.” Leach states, “I felt like I was driving a Cadillac. It’s smooth, easy, and perfect for anyone with shoulder or elbow pain,”

‘Tell-A-Friend’ Tennis Racquet Referral Program Promotes Camaraderie on the Court

We’d like to introduce our newest campaign – the Donnay Tell-A-Friend Referral Program! Here’s the scoop: If you refer a friend to purchase a Donnay tennis racquet, you can receive a cash rebate of up to 10% on your referral’s total purchase!

TTennis Racquet Referral Program by Donnayhe exciting part is that not only do you receive the 10% discount, but so does your friend! There is no minimum or maximum amount you have to spend in order to be awarded the discount, all you need is a Donnay account. Register for your account now, at: http://www.donnayusa.com/shop/register.php.

To ‘tell-a-friend,’ create your referral link using the Tell-A-Friend Referral Program guidelines, and share it with fellow tennis fans! If this doesn’t inspire your volley partners to shop with Donnay, we don’t know what will!

Care to play before you pay? Don’t forget that Donnay has a great tennis racquet demo program, offering one of the longest trial periods in the industry. You can test drive up to 3 of our tennis racquets for up to 3 weeks because we’re confident that you’ll love them!

Think this is a Referral Program worth chatting about? Be sure to share your thoughts with us by leaving a comment below. Don’t keep this awesome cash rebate perk to yourself, either – let your Facebook and Twitter buddies in on the secret! Go on, ‘tell-a-friend’!

Tennis Injuries Among the Young Becoming a Common Story

Tennis Injuries, Common Among KidsWhen Scott Elsass was 16 years old, he found himself a sufferer of intense shoulder pain as a direct result of his years spent playing tennis. “The summer I injured my shoulder, I had played 41 out of 42 days in a row. I had five tournaments in that stretch,” states Elsass, to the Star Tribune.

Tennis is taking a grueling physical toll on young competitors through dangerous arm injuries, like tennis elbow, affecting young players well into their high school years. Elsass was burnt out by the time he was a sophomore in high school and his doctor, Daniel D. Buss, had to coach him through an intense year-long recovery.

Sadly, tennis injuries are becoming a common story among younger tennis players. “Ninth grade is about when you start to see kids experience some soreness in elbows,” Erik Telleen, Minneapolis Washburn tennis coach said. Mayo Clinic Sports Medicine Center athletic trainer, Dan Christoffer, backs this up, “It’s becoming a lot more of an issue.”

Kid’s Tennis Safety: Donnay’s Focus

If Elsass’s story is a common one, why haven’t we heard more? It’s simple! The tennis industry doesn’t want players aware of the possibilities and frequency of devastating arm injuries running rampant among young players.

Why do we care? Education is the key to prevention. If you know what you’re up against, you have a fighting chance. Avoid overuse, and play with the right equipment.

At Donnay, we leverage our patented technology to manufacture tennis racquets engineered for arm safe performance. Donnay tennis racquets are designed to protect the arms of tennis players of all ages by absorbing the shock vibrations that lead to tennis injuries of the wrist, shoulder, and elbow. Through our integration of XēneCore technology, we’re able to offer players ‘arm safe performance’ via longevity, comfort, and protection.

If you feel as passionate as we do about tennis safety among kids and want the industry to be more up front with players about the potential of painful arm injuries, sign the ITF Injury Awareness petition to become part of the large cyber movement. Together, our goal is to compel the ITF to raise awareness of injuries present in the tennis industry.

Have something to say about kid’s tennis safety in tennis, or a question about Donnay’s tennis racquet technology? Let us know by leaving your comment here on our blog. We’re all ears!

Donnay Tennis Racquets ‘Take a Swing’ at Blogging with New ‘Arm Safe Performance’ Blog

Whether you already know and love Donnay, or you’re just getting to know Donnay – our ‘Arm Safe Performance’ blog is going to be your one stop shop for Donnay tennis racquet news and tennis safety information.

What Do We Know About Tennis Racquets?

The Donnay wheels started spinning in 1910 when Emile Donnay founded the company. “In 1934, the Donnay company built its first wooden tennis racket.” By 1969, Donnay brand tennis racquets were the choice of the world’s top players including Rod Laver, Margaret Court, Cliff Dysdale, Bjorn Borg and Andre Agassi. Want to know who’s playing with us now? Check out our current list of Donnay tennis pros at: http://www.donnayusa.com/pros.php.

Donnay Tennis Racquets Launches Arm Safety Performance Blog“Donnay is a heritage tennis brand for the ages. Donnay racquets have been used to win every major tennis tournament in the world and continues its heritage today” with the Donnay X-Series™ racquets which use XēneCore™ technology. “XēneCore’s multiple core and versatility enabled Donnay to create “Shock Armour,” where cavities are closed and open to prevent the dissemination of shock to the arm. As a result, the game of tennis is able to advance to the next level of performance while gaining control, stability and safety.”

For the first time in tennis, racquets can provide safety without limiting performance.

Arm Safe Performance: Hit the Court with Donnay

We’re not the type to just sit in the stands acting as spectators. We like to be on the court, in the middle of all the action. We know tennis, and we know tennis racquets. Now, we want you to get to know us.  Visit us often on our Donnay blog to stay updated on the latest tennis ‘racket.’

Have questions or comments? Drop us a line on any post that raises an eyebrow.

Feeling more social? Connect with us on Facebook, http://www.facebook.com/Donnay, and Twitter, https://twitter.com/DonnayUSA.

We look forward to hearing from you, and meeting your tennis racquet and safety needs.