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Відповідь:Running speed
Elite runners, like the Jamaican Usain Bolt, have regularly been clocked running at nearly 45 kilometres per hour. Such speed would have seemed (17) impossible not so long ago. Scientists now suggest that humans can (18) move faster than even that, perhaps as fast as 65 kilometres per hour.
For years, it was assumed that simple muscle power determined human speed, but recent research suggests otherwise. The most important (19) factor influencing speed is not muscle power but (20) efficiency, and thus how quickly the muscles can contract during the time a runner's foot is in contact with the ground.
Is our athletic ability inherited? Researcher Alun Williams has (21) identified twenty-three inherited factors that influence sporting performance, such as the (22) use of oxygen and strength. As the world population rises, (23) the possibility of there being someone with the right genes for these twenty-three (24) factors will increase noticeably, and thus faster runners are likely to emerge in the future.
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