I. Research related to flip-flops
Auburn University in the United States has done a study related to wearing flip-flops. Under the auspices of Associate Professor of Biomechanics, Wendy Weimar, students from the Department of Biomechanics established a research group for flip flops. The 39 volunteer men and women who participated in the experiment were between the ages of 19 and 25 and had no history of lower limb injuries.
In the experiment, the volunteers will wear running shoes and flip-flops respectively. In order to make the data as objective as possible, the flip-flops provided in the experiment come from different manufacturers and retailers, ranging from $5 to $50, with different materials and comfort levels. For the same reason, running shoes are also a variety of different prices and designs.
Volunteers participating in the experiment will attach sensors to the back, hips, calves, ankles, and feet. There is a platform on the ground. When the foot is stepped on, the foot and the surface of the platform will touch the moment, and the vertical force of the foot will be recorded. At the same time, the experimenter's movement posture when walking, their small movements of the hips, legs, ankles, feet, and toes are recorded by the video system.
The final experimental report pointed out that when wearing flip-flops, the walking pace of people is shorter. The same distance requires more steps to go, which causes the body to withstand more stress, which means that the muscles and joints are subject to more wear and tear.
Second, the flip-flops hurt the feet
Compared with the fine high heels, the pain caused by the flip-flops is slow and inconspicuous, and this undetectable harm is even more terrible.
1, causing chronic damage to the ankle
Mike O'Neill, a spokesperson for the British Foot Care and Foot Doctors Association, said that people wearing flip-flops landed on the outside of the soles of the feet, then turned their feet inward and transferred the pressure to the big toes. This repeated twisting action puts pressure on the ankle. It can cause chronic damage over a long period of time. When the ankle becomes weak, it is easy to sprain, and once a sprain, it will cause frequent sprains.
2, causing inflammation of the plantar fascia
In normal gait, when the person is off the ground, the minimum dorsiflexion angle of the ankle joint is 10°. If it is less than 10°, it will lead to the compensatory reversal of the foot, which will cause the tensile load of the plantar fascia to increase. In the above test, when the volunteer walks through the slippers, the maximum dorsiflexion angle of the ankle joint is less than 10°. Therefore, if the herringbone is worn for a long time, the plantar fasciitis may be caused by excessive stretching of the plantar fascia or Other foot discomforts are inevitable.
3, causing multiple pains in the lower extremities
When wearing a flip-flop, if you can't lose your shoes, you will automatically shorten the stride, and the ankle will turn inward, which will form the "inner eight characters", and the inner eight will cause too much force on the knee, causing strain on the knee joint. In addition, when walking, the center of gravity of the person will tilt forward, the knees will naturally bend slightly, and the lumbar spine will bend backwards. For a long time, the hips and the lumbar spine will be painful. The lack of support for the foot of the flip-flops can also cause pain in the arch and tendon, and may also cause pain in the calf.
4, the foot is more susceptible to trauma
In the UK, more than 200,000 people seek treatment each year for wearing a flip-flop or a chronic foot injury. The annual cost of the British health department in treating injuries caused by flip-flops is 40 million pounds. Flip-flops actually make your feet more vulnerable to trauma. For example, an uneven road will accidentally sprain and bruise; walking grass will be stabbed and cut by flowers and plants; in places where crowds are crowded, there will be a risk of being injured; and so on.
5, make the leg more severely deformed
1 leg type change. Flat-bottomed flip-flops can hardly provide any support to the foot. The ankles must be turned to the inside for better force walking, and the calf is forced to expand. This will lead to the appearance of the inner eight, and the long leg type will be difficult to correct.
2 toe variants. When wearing flip-flops, the toes will bend and “hook†the slippers. The muscle contraction of each step of the toes is inconsistent with normal physiological behavior, which may easily lead to big toe deformity.
3 The deformation of the sole of the foot is normal. Our sole has a certain curvature and can play a buffering role. Wearing a flat flip-flop will take too long, which will cause the gap between the five toes to become larger and cause the foot to sink. flatfoot.
6, to provide a living environment for bacteria
The University of Miami has researched that the number of bacteria carried by flip-flops is as high as 18,000, and there are 13,900 bacteria carried in and out of public toilets. These bacteria include staphylococcus (a deadly bacteria), Escherichia coli, and even Some bacteria on the stool. In the summer, in the case of dry heels, the plastic sole of the flip-flops rubs against the soles of the feet and all the tiny wounds and cracks, which provides an ideal breeding environment for a large number of bacteria. In general, the number of cleaning of the flip-flops is small, and the presence of these bacteria will affect the health of the body.
7, it is easy to cause traffic accidents
A survey found that nearly 1.4 million road traffic accidents or dangers per year were caused by drivers wearing flip-flops. Regarding the question of whether or not to consider the impact of shoes on driving safety, only 14% of drivers will give up driving because of unsafe shoes. Many people will only consider whether it is beautiful or not, and will not consider safety factors. Even 10% of women admit that they will wear shoes that are struggling to walk, but this can easily lead to traffic accidents.
In general, the flip-flops are not impossible to wear, but they should be replaced with other comfortable shoes to recover from the damage caused by the flip-flops.
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