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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: The Key to the Cheetah's Speed
21 June 2012 2:16 pm
Usain Bolt may be looking to cement his Olympic track legacy at this year's London games, but in a competition for world's fastest sprinter, it's the cheetah that takes first place. Though pitting the Jamaican athlete against the speedy cat may not be a fair comparison—especially since in 2009 a cheetah named Sarah bested Bolt's record-breaking 9.69-second 100-meter dash by a good 3 seconds—scientists now know what makes the swift feline faster than similarly built speedsters, such as the racing greyhound. Using high-speed cameras, the team recorded cheetahs and greyhounds galloping across a track lined with force plates. By analyzing the two animals' sprinting patterns and contact forces, the researchers identified several biomechanical factors that help the cheetah outstrip its canine competition, they reveal today in The Journal of Experimental Biology. In addition to having longer stride lengths, cheetahs can increase the number of strides they make per second as they accelerate. While running at the leisurely pace of 9 m/s the cats used 2.4 strides per second, but when they sped up to 17.8 m/s they used 3.2 strides per second. Greyhounds on the other hand, sprinted with 3.5 strides per second regardless of how fast they were going. Surprisingly, in this study the dogs reached speeds of 19 m/s, which were faster than the captive cats' performance. The scientists think that wild cheetahs, which boast speeds of 29 m/s, can use 4 strides per second at their top speeds.
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