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Fitness

Don’t Be Shy: Grunting Improves Performance in Tennis Players

If you've ever watched a tennis match, you know the players make a lot of noise. A new study asks whether grunting is actually helpful, or just a waste of energy.

Doug Dupont

Written by Doug Dupont Last updated on February 24, 2014

Grunting in tennis is a well known phenomenon. Its supporters cite it to be a natural expression of force that improves athleticism. However, once grunting gets to an extreme level, like a full-blown scream, it has been called unappealing, distracting, and even unfair. Whether or not the latter statements are true, no one has really been sure if it helps improve tennis play or not until this month, when a study on just that topic was released in the Journal of Strength and Conditioning Research.

In tennis, the grunting phenomenon has been present for decades, but the idea that loud noise affects performance applies to other sports as well. In weight lifting the Valsalva maneuver, a forced suppression of breath during exhalation, has long been known to improve an athlete’s strength, and is often attended by a loud audible noise. In martial arts, a kiai is a sort of battle cry made during an attack to increase power, startle opponents, and maintain good breathing rhythm.

In the new tennis study, researchers found that grunting actually did increase ball velocity, to the tune of 3.8% faster speeds on average. At elite levels in sports, every percentage point counts, so this was a valuable contribution. The researchers reckoned it was enough to actually reduce the accuracy and power of the return shot.

Nevertheless, although ball velocity went up, it stands to reason there could have also been an associated detriment, such as increased heart rate. If the energy demands related to increased ball velocity became too great, it could make the athlete sluggish and unable to maintain the heightened pace, worsening performance overall. The researchers studied these potential costs of grunting as well. They looked at heart rate, VO2 max, and perceived exertion, and they found none of these factors significantly increased. So the average increase in ball velocity doesn’t require more total effort, just a loud sound.

One limitation of this study was that there may have been a placebo effect. In science, it’s a good idea to avoid the placebo effect when possible. This is done by “blinding” the participants to the key circumstances of the research. Unfortunately, there’s no way to create a blinded condition for grunting versus not. In other words, the tennis players in the study knew whether or not they were grunting, so it is possible that they simply exerted themselves harder when grunting because they believed it made them better.

Despite the inability to eliminate the influence of placebo, the fact remains that ball velocities increased without apparent cost. So long as you believe it works, according to this study, it will work. If you’ve been avoiding the grunt in your tennis matches, or in other sports, for that matter, it’s time to trade in bashfulness for heightened performance.

References:

1. Emily Callison, et. al., “Grunting in Tennis Increases Ball Velocity But Not Oxygen Cost,” Journal of Strength and Conditioning Research Publish Ahead of Print, DOI: 10.1519/JSC.0000000000000333

Photo courtesy of Shutterstock.

Doug Dupont

About Doug Dupont

Having grown up at the foot of a forest covered mountain in rural Vermont, Doug was active from a very young age. Hiking, running, and climbing were a part of everyday life in the Green Mountains. This culture of exercise led to dabbling in martial arts as a teen, and also getting work in a local powerlifting focused gym. Doug continued to pursue knowledge and training in exercise, becoming a certified personal trainer while still a teenager. Once in college he began his hand at the business side of fitness, taking a management position at a large local gym. During that time he became a founding member of the UVM Brazilian Jiu Jitsu club, and was the first among their competition team. After only a few months he was assisting in coaching, and ran conditioning program for the club.

Out of college Doug set up his own training center. He grew his list of clientele including several professional MMA athletes, eventually going so far as to corner a world title fight. He has continued ­­­to develop his business into today.

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