A friendlier carbo-loading strategy was devised in 2002 by scientists at the University of Western Australia. It combines depletion and loading and condenses them into a one-day time frame. The creators of this innovative protocol recognized that a single, short workout performed at extremely high intensity creates a powerful demand for glycogen storage in both the slow-twitch and fast-twitch fibers of the muscles.
The researchers hypothesized that following such a workout with heavy carbohydrate intake could result in a high level of glycogen supercompensation without a lot of fuss. In an experiment, the researchers asked athletes to perform a short-duration, high-intensity workout consisting of two and a half minutes at 130 percent of VO2max (about one-mile race pace) followed by a 30-second sprint. During the next 24 hours, the athletes consumed 12 grams of carbohydrate per kilogram of lean muscle mass. This resulted in a 90 percent increase in muscle glycogen storage.
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Runners have cause to be very pleased by these findings. Doing just a few minutes of high-intensity exercise the day before a competition will not sabotage tomorrow’s performance, yet it will suffice to stimulate the desirable carbohydrate “sponging” effect that was sought in the original Ahlborg protocol. This allows the athlete to maintain a normal diet right up until the day before competition and then load in the final 24 hours.
The Western Australia carbo-loading strategy works best if preceded by a proper taper — that is, by several days of reduced training whose purpose is to render your body rested, regenerated, and race-ready. In fact, several days of reduced training combined with your normal diet will substantially increase your glycogen storage level even before the final day’s workout and carbohydrate binge. When you exercise vigorously almost every day, your body never gets a chance to fully replenish its glycogen stores before the next workout reduces them again. Only after 48 hours of very light training or complete rest are your glycogen levels fully compensated. Then the Western Australia carbo-loading regimen can be used to achieve glycogen supercompensation.
An even newer carbo-loading protocol calls for athletes to eat a normal diet of 55 to 60 percent carbohydrate until three days before racing, and then switch to a 70 percent carbohydrate diet for the final three days, plus race morning. As for exercise, this friendliest carbo-loading method suggests one last longer workout (but not an exhaustive workout) done a week from race day followed by increasingly shorter workouts throughout race week.
Having said all of this, I would like to note finally that carbo-loading in general has been shown to enhance race performance only when athletes consume little or no carbohydrate during the race itself. If you do use a sports drink or sports gels to fuel your race effort — as you should — prior carbo-loading probably will have no effect. But it doesn’t hurt to do it anyway, as insurance.
About The Author:
Matt Fitzgerald is the author of numerous books, including Racing Weight: How To Get Lean For Peak Performance (VeloPress, 2012). He is also a Training Intelligence Specialist for PEAR Sports. To learn more about Matt visit www.mattfitzgerald.org.