July 31, 2009

Science behind record breaking swims

Hi-tech textiles in sport are nothing new. In recent years we have seen the design of fabrics that can take moisture away from the body, patches on All Black jerseys so players can dry their hands for better grip, fabrics that can sense high impact stresses on players joints, and fabrics that can sense heart rate, temperature and other physiological data (see Zephyr Technologies).

All are performance enhancing to varying degrees, but perhaps not quite as much as the latest hi-tech swimsuits worn by competitors at this years World Championships in Rome. There is a lot of talk in the media at the moment in regard to these swimsuits, which have seen numerous records broken so far. And not just broken, smashed in some instances, by up to 6 seconds! The science behind these suits is quite interesting. There are two aspects to it - posture and drag.

The corset-like suits are made of an incredibly compressive material (apparently they take an age to squeeze into) that holds the swimmer in an optimal posture. Because the swimmer doesn't have to use any of their muscles to hold this posture (like usual), more of their energy can be directed to their propulsion through the water. The compressive nature of the suit also stops water becoming trapped in the suit, and reduces the amount of skin 'wobble', which both contribute to drag, the second aspect.

Drag refers to the forces that oppose the relative motion of an object through a fluid medium. It is wasted energy. In chemistry we call something that is attracted to water hydrophilic, and something that repels water hydrophobic. These hi-tech suits are hydrophobic - they actually repel water, like a bead of water on a lotus leaf, or like oil in water. This creates a water-repellent seal that adds buoyancy, lessens drag and creates record swim times.

Speedo's LZR suit did this by adding polyurethane panels over the parts of the body that contribute the most to drag. This suit saw a multitude of records fall in Beijing 2008, and 94% of gold medals were won by swimmers wearing LZR's. The obvious next step was to make an entire suit from the stuff, and this is what the current outcry is about. There is an excellent article about it all here.

So, at what level is science in sport too much? Where does the competition of man vs. man instead become a competition of who has the best equipment? Personally, I have no problem with it - I believe sport science (both physiologically and technologically) will continue to evolve because people will always strive to be fitter, faster and stronger. The question is, how can we level the playing field, so that good competition, the real essence of sport, is still the centerpiece of the show?


  1. There is an obvious solution. Budgie smugglers and bikinis.

  2. I was being a bit silly but the principle is what's important. This technology race disadvantages swimmers from countries unable to afford the latest and greatest. We saw this in Beijing where athletes from poorer countries were often the only ones wearing the traditional cossies. A restriction on how much of the body can be covered by the swimsuit could at least reduce this advantage. Of course everybody knows that the greatest performance enhancing technology in the history of swimming was Mark Spitz's tache.

  3. I think in all codes at some stage in time there has been controversy over the use of new high tech equipment. Cricket - Ricky Ponting using a bat from a mixture of wood and carbon graphite. Baseball - The embarassing explosion of Sammy Sosa's corked bat or 'net bat'. Each code reacted in different ways to these incidents. In recent years the ICC has had to carefully tackle the fine line between the use of new technology and the use of traditional umpiring. If Rudi Koertzen umpired more Black Caps fixtures, we could see records tumble. The ICC cannot scrap results due to poor work by the officials. The use of S & T has swayed results in some huge matches as of late. However, it seems individual sports hold a greater respect when it comes down to records and numbers. I have lost my train of thought.

    But who would you choose if you are sitting on 499 not out in the dying minutes of play, Hawkeye or Colin Hawke?



Enter your email address:

Delivered by FeedBurner