Previous studies have shown that when a person runs barefoot, he lands on the fronts or middles of the feet.Then the heels(脚后跟) go down.During this process, the weight of the body is at first on the fronts of the feet, then moves to the heels.When a person wears shoes, however, he tends to run so that his heels hit the ground first.The effect of the heel hitting the ground many he much more forceful than the effect of the front of the foot hitting the ground.
The researches also studied barefoot runners in their laboratory.The goal was to measure the force with which a runner's foot hits the ground.A rear-foot (后足) strike is like someone hitting you on the foot with a hammer with about one and a half to three times your body weight.It would hurt without a shoe.Lieberman said. A forefoot strike is like having no one hit you at all.The study explores the physics of running, which is a complex topic.
The idea that barefoot running is better is a massive assumption.Reed Ferber, a biochemist at the University of Calgary in Canada said.Basically, there are no studies out there that show barefoot running is less injurious.
41.Lieberman' s attitude towards barefoot running is ______.
A.supportive
B.negative
C.neutral
D.unclear
42.According to the studies, if you run barefoot, you ______.
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