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...Jesse Owens won the 100m gold with a blistering time of 10.3 secs - today, that's par for junior level speed athletes. We now have better equipment, better training and improved nutrition, along with faster tracks and, crucially, a lot more endorsement money to be made by running as fast as possible, and that's uncovered a deeper pool of better runners than ever before...
Elite sprinters are not, however, simply improved versions of the average Sunday runner. They are physiologically different. For example, a typical human has in his skeletal muscles an equal balance of "fast-twitch" muscle fibers (quick contracting, easily fatigued muscle tissue that generates high power) and "slow-twitch" fibers (the muscle mass that uses oxygen - aerobic, rather than anaerobic), on which endurance runners rely. Slow-twitch muscle can contract for long periods of time with less fatigue, which helps some distance athletes run up to 60 mi. per day. Sprinters legs are genetically blessed with 70% fast-twitch...
That helps explain why Bolt's legs move fast enough to be a blur. When people run, they are essentially bouncing though the air from one leg to another, says Daniel Lieberman, a professor of biological anthropology at Harvard University who studies how and why the human body looks and works as it does. What determines how fast people go is their stride length - a function of how long the legs are, how powerfully they push off into a stride and how far forward the body jumps - and their stride rate, which is how fast they can propel their legs...
...Washington Live Fast, Die Young(er) Though car-accident fatalities are declining, the number of Americans killed on motorcycles has risen dramatically. Strong sales, boosted by the bikes' fuel efficiency and baby boomers' desire to relive their two-wheeled glory days, have increased the number of motorcycles on the road. Meanwhile, just 20 states now require helmets, compared with...
...make table tennis more fan - and viewer - friendly. Releasing fewer toxic fumes into the air is one step. They also want to make the action a little easier to follow. After making its Olympic debut in Seoul in 1988, officials decided it was too hard to follow the fast-flying ball as it zipped from one end of the table to the other, so for the 2000 Games, they increased the regulation ball size to 40mm so even the most glassy-eyed couch potatoes could see it better on TV. The next year, they lowered the score scale so sets...