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 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.

Let’s Talk Donnay Tennis Racquets

Tennis Racquets by DonnayWe all have names for sentimental items in our lives. Whether you have a name for your car, your phone, or your favorite hat – it’s there because it’s something you value.

Tell us, does this sound valuable? Donnay’s line of solid-core tennis racquets return more energy to the ball and better absorb shock in the hoop for a rare combination of power, control and arm safe comfort. The result is more winners and fewer arm injuries. We bet your arm is smiling at the thought…

Let’s bring it back to sentimental items. One Donnay enthusiast refers to his racquet as “The Velvet Hammer!” What have you named your Donnay tennis racquet?

‘Engineered for Arm Safe Performance’ Defined

Tennis Arm Injuries is Top Focus of DonnayChief Designer Jerry Choe was inspired to develop an arm safe racquet because of his own battle with tennis elbow. Choe was inclined to come up with a solution to what was afflicting millions of tennis players each year, and in some cases, forcing them to retire from the game thy love.

“It is well known in medical circles that the shock and vibration generated by repeatedly striking tennis balls with conventional racquets adversely affects muscle tissue and arm joints in the wrists, forearms, elbows and shoulders,” says Dr. Anders Cohen, chief of neurosurgery at the Brooklyn Hospital Center and sports-medicine expert. “Most medical theories attribute tennis elbow, which will afflict every other tennis player at some point in his/her playing lifetime, to continuous exposure of the playing arm to this ‘impact shock.’”

According to the ITF, 70% of kids in tennis training programs suffer through serious injury and surgery before the age of 13. Over the past 10 years there’s been a dramatic increase of tennis arm injuries due to the evolution of the game.

But as the game evolves, so does Donnay.

Experience the Donnay Difference

Most conventional modern racquets are designed with hollow frames to reduce weight and are made stiff in an effort to maximize the energy returned to the ball. This creates more power, which in turn, results in the racquet transmitting even larger amounts of shock and vibration to the players’ arm.

Donnay’s engineering solution is to fill its frames with a patent-pending solid-core inner tubing called XēneCore™ that acts as a super dampening agent and shock absorber. XēneCore™ begins as a light power in its natural state and is then baked into the racquet mold and rises like cookie dough. This not only keeps the racquet weights light and maneuverable, but it also has an extremely high-tensile strength that makes the frame highly stable and durable and, in fact, allows Donnay tennis racquet beams to be as thin as an incredible 15 millimeters in the X-P Dual line, making them the most aerodynamic and maneuverable tennis racquets in the game.

These solid-core frames also minimize energy loss on ball contact, providing the user with an extra boost of power, along with pinpoint control and rock-like stability against the forces of twisting and torque.

Tennis Racquet Demo Program by DonnayOf course, the real test – and the only one that counts – is picking up a Donnay and playing with it. You’ll immediately notice an audible difference in the first swing as the ball comes off the lively racquet face with a reassuring and resonant solid-to-the-core “thunk!” instead the annoying ping of hollow racquets. You’ll also notice the plush luxury-car-like comfort and the total lack of impact shock as you’re able to direct your shot with ease to its intended target on your opponent’s court.

We’re so confident that you’ll appreciate the Donnay difference that we’re offering a three-week tennis racquet demo period – the longest in the industry – and a 30-day no-questions-asked guarantee on our shop at: www.donnayusa.com/shop.

Do you think Donnay is the racquet for you? Let us hear your thoughts by dropping us a line in a comment on our blog. You can also connect with us on Facebook and Twitter. We’ll ‘take a swing’ at whatever you throw our way!