Remember those new shoes you got for school? Or those new
shoes you bought for track? Or those new soccer cleats you just had to have before the new season started? There\’s nothing quite like a fresh new pair of kicks to make you feel your best. You slide your into them and your stuff at school, on the track, or on the field. But by the end of the day or the close of practice, your feet might be hurting. In fact, you might have a very area around your that burns and hurts to touch. What\’s going on here? Chances are those new shoes may have given you a! A is a condition in which from two surfaces together causes an area of to become raised with a liquid just beneath the. They\’re basically fluid-filled bumps that look like bubbles. Blisters are most common on the hands and feet. and from new shoes or shoes that are too tight often cause blisters on the toes and ankles.
You might also get blisters on your hands if you\’re working with a tool repeatedly. For example, if you rake the leaves in your yard, you might get a on your hand from where the rake handle rubs the of your hand in the same spot. Most blisters heal on their own, but they can get if you\’re not careful. If you get a, follow the suggestions in the Try It Out section and make sure you tell an adult, so you can be sure that you don\’t need to see a. The best way to handle blisters is to avoid them in the first place. If you\’re going to be doing work with some kind of tool, such as a or a shovel, wear to protect your hands from the repeated that causes blisters. As for your feet, make sure that you buy shoes that are the correct size. When your shoes are brand new, break them in slowly. Wear them for a while and then switch back to an older pair.
Over time, your feet will get used to them and you can avoid getting those blisters! 1. Type of skin The skin of our feet is susceptible to blister formation, particularly the plantar (sole) surface. Thatвs because it\’s thicker and less mobile than other skin and most able to form and maintain a fluid-filled lesion. And every individual\’s skin has an inherent shear strength – mine\’s rather low and that makes me blister prone. Other people are blister resistant because the shear strength of their skin is high. We\’re all different in many ways, from blue eyes to big noses. shear strength is just another of those differences. 2. High coefficient of friction (pressure and friction) No other body part sustains pressure like the foot does – because we walk on them. And there are few other body parts where the micro-climate dictates there will be high friction by default (heat, moisture little evaporation).
This high coefficient of friction means the skin grips the sock, and the sock grips the shoe. These surfaces remain stuck together, for longer. The result is internal tissue layers slide further relative to each one another. When the connections that bind these layers are stretched too far, they tear (it\’s a mechanical fatigue – Comaish, 1973). Fluid fills the injury site and you have a blister. [Insight: To see how important friction is, put a drop of oil on the back of your hand (minimise friction) and wobble again. Regardless of how hard you press, there is almost no shear. Seriously. do it now! This is why minimising friction is key to blister prevention]. 3. Moving bone As you walk, run and play, the bones move around within your foot.
As your foot plants, the bones skid forward to a stop, and then backwards as they push off into propulsion. This is normal and unavoidable. But the further the bones move, and in the presence of high friction, skin shear can become excessive. That is, the structural connections fatigue and fail. This is a blister-causing level of skin shear. 4. Repetition The more times soft tissue is subjected to these high shear distortions, the closer the structural connections between the tissue layers are to breaking and forming a blister. Everyone sits in a different position on the blister continuum and this explains why some people seem to be – they get blisters with relatively few repetitions. And others are blister resistant – they can run day after day in the most challenging of conditions and not suffer a single blister.