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JANDA RICCI-MUNN |
| Sport Specific Training Services |
| *** Newsflash *** |
| Training Tip of the Month |
| "Power to Weight" ratio is a term that just about every competitive cyclist and triathlete has heard about at some point or another but the meaning, and real world application is often misunderstood. Power to weight ratio measures the amount of power (watts) that an athlete can generate for a specific period of time and divides this number by the athlete's body weight (typically in kg). For example, a 70kg cyclist produces an average of 350 watts for 20 minutes during a 20 minute max test. His power to weight ratio for the test would be exactly 5 watts/kg. All things being equal (i.e. the cyclist's coefficient of drag, tire rolling resistance, etc.) on a flat time trial course, the cyclist with the highest sustainable power output will ride faster than everyone else. Should the same time trial take place on a very hilly course however, things become a little more interesting. For example, let's say that we have 2 cyclists. Rider 1 weighs 80kg and can produce 400 watts for 10 minutes. His 10 minute power to weight ratio is 5 watts/kg. Rider 2 weighs 55kg and can "only" produce 300 watts for 10 minutes. Her 10 min. power to weight ratio is 5.45 watts/kg. Our cyclists compete in a 2 mile uphill time trial that features a constant grade of 8%. Rider 2 easily beats rider 1 to the finish line. Reason: Her superior power:weight ratio allows her to climb with a much higher degree of efficiency. Simply put, her "engine" doesn't have to put out as many watts in order to overcome the affects of gravity. Looking to optimize your engine in '09? JRM |
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JRM |
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Power:Weight |
