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The more time young men spend engaging in high-impact physical exercise, the greater their bone mineral density, a new study of medical students shows.

Will he be back?

"Now's not the time to ask that question. The answer now is no, I'll never be back. But I reserve the right to change my mind," he said. "I don't know how these guys do it."

Sprinters on the inside lane at a track meet are at a distinct disadvantage because as they go around a bend it is tighter than on the outside lane so they have to compensate more.

Because of this the International Association of Athletics Federations has abandoned indoor sprints that have tight bends.

Powered by torque
But greyhounds keep a constant stride on the straight and bends and withstand a 65 percent increase in limb forces.

?This supports the idea that greyhounds power locomotion by torque about the hips, so -- just as in cycling humans -- the muscles that provide the power are mechanically divorced from the structures that support weight,? Usherwood explained in the journal.

Horses, hares and greyhounds have about the same top speed at roughly 17 meters a second or about 37 miles per hour, nearly double the pace of humans, according to Usherwood.

According to a study conducted by researchers at the university's School of Sport and Exercise Sciences, introducing caffeine into sports drinks increases the absorption rate of carbohydrates by 26 percent.

In a second study, 15 elderly volunteers accomplished attention tasks markedly faster after completing a 6-month aerobic-training course than they had before the course started. Participants gradually built up to walking for 45 minutes at a moderate pace three times each week. By the end of the study, these volunteers' brain activity resembled that of highly fit seniors in the first study.

In contrast, 14 seniors who completed a 6-month course of stretching and toning exercises, but not aerobic exercise, showed little improvement on the attention task. Their brain activity was similar to that of less-fit seniors in the first study.

Serge England Arbona ran 152.27 miles on a treadmill in 24 hours to stake a claim to four world records.

Kenyans ruled at yesterday's New York City Marathon, as Martin Lel and Margaret Okayo won the men's and women's crowns, respectively. It was the fifth time a Kenyan man has won the race since 1997, and the fifth time for a Kenyan woman since 1994. In addition, Kenyan men have won 12 straight Boston Marathons. Why are Kenyans such successful distance runners?

"Everyone knows about dehydration, and the answer to that used to be 'Drink, drink, drink, you can't overdrink,' " said Arthur Siegel, a researcher. Siegel examined the blood of Bellamy and Cynthia Lucero, who died of cerebral swelling caused by hyponatremia at the 2002 Boston Marathon. "Well, you can overdrink, and overhydration is more dangerous than under."

Very nice palce to run trails.. soft surface and interesting terrain. Alex "discovered" it on a recent trip up here.

A Buddhist priest dubbed the "marathon monk" has completed an ancient running ritual in the remote Japanese mountains that took seven years and covered a distance equivalent to a trip round the globe, wearing only a flowing white robe and flimsy straw sandals.

Being a vigorous exerciser and adding other healthy lifestyle factors such as not smoking, staying lean and drinking only moderately had the effect of adding 10 years to a man's sexual status, Rimm said.

The standard lane width for most high school and college outdoor tracks in the United States is 42 inches. This gives 6.70 meters of extra distance per lane per lap. So lane 4 would have a distance of 420 meters and lane 8 a distance of 447 meters, rounded to the nearest meter.

"OK, let's go," he will say when everyone is ready, and then he takes off.

Those who can finish the 3-mile circuit up and down hills without stopping get a gray T-shirt marking them as a member of the president's 100-degree club.

Those who do not finish have to make do with the class photo.

Seattle

For more than 30 years, bikes have been planned as part of the transportation mix here. ''The city boasts more bike club members than any other in the U.S. In addition to many miles of city bike paths, Seattle has one of the most scenic rides in America, the Cherry Hill Route, a 35-miler that starts with a ferry ride across the Puget Sound to Bainbridge Island.'' 206-224-9252; www.bicyclealliance.org.

Once again, four legs triumphed over two Saturday when a horse won the annual Man vs. Horse race.

Thirty horse-and-rider teams took on 300 individuals and 60 relay teams in the 22-mile race.

The winning horse, Druimghigha Shemal, finished in 2 hours, 2 minutes, beating the fastest individual runner Mark Croasdale, who crossed the line in 2:17:00.

Humans are given a 15-minute head start in the race, which has been held for more than 20 years. In 2001, a three-man team beat the fastest horse, but no one has claimed the large cash prize offered to the first single human to win the race.

The prize money rises by $1,450 each year and now stands at $40,000.

When I got back to the hotel, my cultural attach? had a few choice words for me. He was pretty well controlled, but it was communicated to me that that wouldn?t happen again, and of course it didn?t. But it was really a bizarre experience. It was like a three or four mile run, but it was the most interesting 30 minutes of my life in many respects.

During the study, 252 men died. More than 75 percent of these were attributable to heart disease and stroke, and the remainder to cancer.

Men with the lowest leisure-time exercise levels were more likely to die during the study, the researchers found.

The heaviest levels of physical activity were associated with the lowest rates of death from all causes and heart disease. But moderate and light levels of regular exercise had no consistent impact on death rates.

"Vigorous physical activity, such as climbing stairs, hiking, jogging, swimming, tennis, badminton, squash and heavy digging, may independently prevent premature death, principally from cardiovascular disease and coronary heart disease in middle aged men who have no evidence of pre-existing coronary heart disease," the researchers write in the journal Heart.

Compared to having no caffeine in the bloodstream, two cups of coffee actually increased the flow of blood through the heart at rest. However, the caffeine decreased the blood flow during exercise relative to flow at rest.

The coronary flow reserve -- the additional amount of blood that can be supplied to the heart during stressful situations like exercise -- was cut by 36 percent during the caffeinated workout at sea level and 56 percent during the mountain simulation, compared to the caffeine-free workout.