Flip-flops

It is best not to wear flip-flops ~ Hazard link: After the summer vacation, students return to school one after another, and the number of people who go to the school hospital for treatment because of leg pain and foot pain has greatly increased. This phenomenon has attracted the attention of Professor Wendy Weimer. She is an associate professor of biomechanics at Auburn University and director of the Biomechanics Laboratory. She found that most of the shoes worn by students with leg and foot pain in summer are flip-flops. Going back to school in autumn, changing online sneakers or street shoes, my legs and feet are strongly uncomfortable.

Under the auspices of Professor Wendi Weimer, students of Biomechanics Department set up a research group on flip-flops. The group gathered 39 volunteers, both male and female, aged between 19 and 25.

In the experiment, volunteers will walk in running shoes and flip-flops. In order to make the data as objective as possible, the flip-flops provided in the experiment came from different manufacturers and retailers, and the prices ranged from $5 to $50. Similarly, running shoes come in many different prices and designs.

Volunteers participating in the experiment will put sensors on their backs, hips, calves, ankles and feet. There is a platform on the ground. When the foot steps on it, the data of vertical force on the foot will be recorded at the moment when the foot touches the surface of the platform. At the same time, the movement posture of the experimenters when they walk, as well as any subtle movements of their hips, legs, ankles, feet and toes are recorded by the video system.

The experimental report points out that when people wear flip-flops, they walk with smaller steps. This leads to more stress on the body, because you have to take more steps for the same distance. This means that muscles and joints will suffer more wear and tear.

Everything comes from a tiny movement of the toes when walking.

When wearing flip-flops, people are worried that shoes will fly off, so they will consciously bend their toes to grab the soles when walking.

"The body is a precise and wonderful machine. When you exercise a certain group of muscles, it will be implicated in the movement of other groups of muscles. Tightening the muscles of the toes will cause the muscles that pull the toes up to stop moving. This means that you can't lift your toes high enough when you walk. " This is a chain reaction. Because the shoes are pinched, the toes can't be relaxed and lifted, which leads to a large angle of ankle joint change and a small vertical stress on the heel. Therefore, when the same experimenter wears flip-flops, his stride is smaller than when he wears running shoes.

"The change of stride will lead to a series of changes in the body's power chain. Starting from the soles of the feet, it extends to the ankles, calves, knees, hips, back and extends to the whole body. " Schloyer said.

Bending your toes and grasping the soles of your feet will lead to excessive use of plantar aponeurosis and connective tissue from toes to heels, leading to inflammation of soles and heels, and even pain in hip joints and back.

"Buckled sandals are a healthier choice because your toes don't need to bend and tighten your shoes to prevent them from flying away. These shoes can also provide better ankle and heel protection. " Schloyer said.

Schloyer, who also owns two pairs of flip-flops, said: "The experiment doesn't recommend that people never wear flip-flops, but they can't wander around all day. And like running shoes, it will be changed in three to four months. "

Achilles tendon, English is Achilles tendon, Achilles heel in Greek mythology. Achilles tendon connects the end of fibula muscle with calcaneus. When we walk, the calf muscles contract, and the Achilles tendon helps them pull up their heels and leave the ground. Walking in flip-flops requires more strength to lift the heel, which leads to the demand for achilles tendon and prone to achilles tendinitis.

Symptoms of Achilles tendinitis:

1. Pain, tenderness and stiffness in the Achilles tendon can occur in any part of the Achilles tendon, usually in the early morning or during rest after strenuous exercise.

2. When the two tendons are squeezed, there will be severe pain or tenderness.

3. When the lesion gets worse, the tendon will swell and nodules will appear in the lesion area.

Flip-flops for high-risk people

1. Paparazzi-ridden star: When a star reaches the level of Faye Wong, paparazzi will follow him as soon as he goes out. People who have to walk fast everywhere are the least suitable to wear flip-flops, but it happened that such people love flip-flops most, and they are simply the spokespersons of flip-flops. Faye Wong loves to wear flip-flops in winter and summer. She is the best example of flip-flops fashion and a representative of being hurt by flip-flops. She doesn't need to go to Emei Mountain for advice. Because she wears flip-flops, Faye Wong's ankles, calves, knees, hips and back are all black spots of her health.

2. Pregnant women and overweight people: Overweight people need more support from shoes, and they usually put more pressure on their feet, ankles and back. And flip-flops will aggravate the loss of these positions and bring more harm to these parts.

3. Shoe thrower: Paris Hilton's sister Nicky often wears flip-flops when she goes shopping in summer, but once she threw flip-flops on her left foot while shopping, which made the paparazzi next to her laugh. In fact, sandals are easily dumped, and flip-flops are more easily dumped. To ensure that you don't get dumped, you can only clamp it hard, which will easily hurt your achilles tendon. Therefore, those who are easy to reverse their shoes are not suitable for wearing flip-flops, and their image is ruined.

4. People who need special care for their feet: Athletes who advertise by their beautiful legs, such as Lin Chi-ling and Cristiano Ronaldo and Yao Ming who compete by their feet, should not wear flip-flops. Flip-flops will increase the chances of sprains and falls, which is of great significance. Look before you leap.