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.

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,”

Donnay Tennis Racquets Meet Pinterest on the Court!

Donnay Tennis Racquets Now on PinterestDonnay is now serving it up on another social media platform: Pinterest!

We’re excited to inspire our followers by visualizing what we’re most passionate about.

From tennis health news, the current medical view on tennis ailments, tennis safety and our arm-safe tennis racquets, we’re covering the pinning bases at a rapid speed.

Follow us at http://pinterest.com/donnayusa in order to see our latest pins! Don’t forget to browse our foundational boards:

  • Tennis Racquets
  • Health Comes First
  • Medical View
  • Tennis Safety
  • Tennis Health News

We’d love to hear your thoughts on our Pinterest boards. Be sure to drop us a line right here on our Safety Blog. You can also hit us up on Facebook and Twitter! We look forward to connecting.

Donnay Tennis Racquet: The Right Answer for Ryan Young

Many athletes face pain and injury from time-to-time. Sadly, it happens. However, Donnay has found the answer to tennis elbow, tennis shoulder, and other tennis related injuries.

Take Ryan Young, from Charleston, as the perfect example. Ryan has been playing tennis since the age of four. By the time he reached the junior level of competition, he was breaking and setting records that seemed nearly unbreakable. Ryan was soon ready for college and took on a Division I challenge at Clemson University. While at Clemson, Ryan was encouraged, by his coach to go pro. Everything seemed to be falling into place.

Ryan Young was a professional tennis player for three years. He was just getting into a comfortable routine as a professional athlete, when he was sidelined due to tennis related injuries. Over the past year he has gone through two surgeries to repair his torn shoulder. Ryan’s statistics drastically decreased and the matches that were supposed to be easy wins, turned into challenging losses. Ryan needed a resolution for his tennis injury pain .

Ryan found the solution in the solid core Donnay tennis racquet.

When Ryan started using his Donnay racquet he instantly felt a difference in his performance and his tennis elbow.  He was back and ready to get play to his highest level of performance!

Tune in as he shares his Donnay tennis racquet story, below:

Tell Us Your Donnay Tennis Racket Story

“Right away I really liked it! I never felt any vibration in the Donnay racket.” – Ryan Young

Do you have a story to share about relieving tennis injury pain by simply switching out your tennis racket? Let it be heard by visiting http://mydonnaystory.com/ to submit your testimonial. Simply click on ‘Share Your Story’ to provide your contact information and video story URL.

Alternatively, you’re always welcome to leave a comment right here on our Safety Blog, and get social with us on Facebook and Twitter.

We’re serious about keeping players informed! Don’t forget to check out our new Medical View column. Our recent article by Dr. Dines provided excellent insight on forearm pain and ‘golfer’s elbow. Check it out, here: http://www.donnayusa.com/fore-on-your-forehand.php.

 

Donnay Tennis Racquet Technology: ‘Arm Safe’ XēneCore

The Donnay brand has aligned it’s racquet design with the engineering mantra, “Arm Safe Performance.” Why? Because Donnay tennis racquets are backed with the groundbreaking XēneCore Technology, which helps protect your arm from serious ailments such as tennis elbow and frozen shoulder, all while increasing performance and ensuringDonnay Tennis Racquet Technology your longevity in the sport!

So, what is XēneCore exactly? XēneCore is a leading carbon composite manufacturer that develops lightweight, high strength, and shock absorbent composites that we, at Donnay, use within our revolutionary arm safe racquets.

XēneCore provides an increased tensile strength for a harder hit on the court, while the composition allows any object to have thinner outer layers. This technology is what makes a Donnay tennis racquet less taxing on the arm.

With the racquet’s solid inner core, vibration and shock are almost entirely eliminated, greatly decreasing the impact the ball has on your playing arm! Yes, you’re reading this right… XēneCore provides more caution where you need it the most – on the court!

Already thrilled over the tennis safety features offered by the pioneering XēneCore technology? Then don’t wait another minute! Lean on the industry’s longest tennis racquet demo program to test your very own Donnay tennis racquet today. We promise, you’ll learn ‘first-swing’ what all the fuss is about! That being said, the ball is in your court.

Share your thoughts on XēneCore and Donnay’s arm safe racquets by leaving a comment below! We look forward to answering your questions.

‘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’!

Donnay Tennis Racquets Put Bradley Frohman Back in the Game

What’s your Donnay story? Everybody has one.

Bradley Frohman nearly quit tennis because of his terrible Donnay Tennis Racquets - What's Your Tennis Racket Story?experience with tennis elbow, which took all ‘fun’ out of the sport for him.

Once a top ranked player in the Mid-Atlantic 50’s, he quickly found himself losing to competitors at the basic 50 level and even those at the 45 (which he’d never done before). It was impossible for him to keep up because of the painful feeling penetrating his shoulder as he swung his conventional hollow-bodied racket.

Ready to give up on his passion, he made the switch to solid core Donnay tennis racquets, some of the best in the industry for players suffering from tennis elbow.  He bought three of them and has found that he is once again winning, beating players at the 45 and 50 level! Frohman has even rediscovered his love for tennis!

Tune in as he shares his Donnay story, below:

Tell Us Your Donnay Tennis Racket Story

“My arm is back at full strength and so is my game with my new Donnay tennis racket!” –Bradley Frohman

Do you have a story to share about relieving tennis elbow pain by simply switching out your tennis racquet? Let it be heard by visiting http://mydonnaystory.com/ to submit your testimonial. Simply click on ‘Share Your Story’ to provide your contact information and video story URL.

Alternatively, you’re always welcome to leave a comment right here on our Safety Blog, and get social with us on Facebook and Twitter.

We’re serious about keeping players informed! Don’t forget to check out our new Medical View column. Our first Q & A session with Doc Donnay provided excellent string advice. Check it out, here: http://www.donnayusa.com/medical.php

 

Tennis Injuries Affect Adult Pro Players, Too!

It seems every time we click on the television to watch our favorite tennis matches, there is another taped shoulder greeting our eyes…

Tennis Arm Injuries | The Growing EpidemicTennis Arm Injuries | Tennis Safety

 

Last week we spoke to the common story of tennis injuries among juniors. Yet, injuries in the sport of tennis are not exclusive to juniors alone. Many adult pros suffer from the same arm pains that plague tennis players more often than not. Whether it’s shoulder pain, tennis elbow pain, or wrist pain – it’s still pain.

Tennis Racquets Down: Roddick and Clijsters Retire

Mere weeks ago, at the 2012 U.S. Open, both Kim Clijsters and Andy Roddick announced their retirement, willingly storing their tennis racquets on the shelf (so to speak). Injuries were not cited as a reason, but it’s understood that both of these top players had been down the injury road not too long ago.

Kim Clijsters Tennis ProIn April of 2011, Kim Clijsters’ experienced both shoulder and ankle injuries. Having taken time off to heal her shoulder, she also endured a bad ankle sprain. This kept her off the court for quite a few weeks and put the French Open and Wimbledon matches in front of her at significant risk.

Only one month later, in May of 2011, Andy Roddick, who had previously complained of shoulder pain as early as the 2010 Australian Open, withdrew from the 2011 French Open with a shoulder injury. His absence at this tournament came as a huge disappointment for American tennis fans. The pro player, who won a slam Andy Roddick Tennis Proback in the 2003 U.S. Open, was forced to pull out of his doubles event and his singles match.

In the public eye, the Clijsters and Roddick retirements were not pinned on tennis injuries. It’s poignant, however, that both of these spirited players had to endure such weakening injuries only a year before they chose to leave the game. We know the media paints a pretty picture when our favorite pros decide to step out of the limelight, but we also know that tennis arm injuries can be devastating to the body (and a pro career).

Concerned that you’re playing with the wrong tennis racquet? Don’t be afraid to share your concern. Join the movement for raising awareness of injuries present in the tennis industry by filling out the ITF Injury Awareness Petition.

Has your tennis racquet caused injury to your arm? Visit the U.S. Consumer Product Safety Commission website to Report Your Injury. We encourage any of our readers who’ve found that a particular racquet has caused damage to their arm to report their findings to organizations that will listen.

Turns out, we’re listening too! So, don’t forget to drop us a line here on our Arm Safe Performance blog.