Reduce Friction to Reduce Shear

December 21, 2014 by · Leave a Comment
Filed under: blister care, Foot Care, Foot Care Products, Sports 

I have often mentioned the website BlisterPrevention.com.au as a great source of information on blister care. Rebecca Rushton, manages the website and is on top of developments in the prevention and care of blisters. She’s a podiatrist in Australia – and a friend.

Through research and looking at the mechanism of how blisters form, Rebecca has changed some old theories of what causes blisters. Heat, moisture, and friction were always considered the three contributors of blisters. Further consideration has found that shear is a major factor. Shear and friction combine to cause blister formation.

You must reduce friction to  blister-causing shear.

You must reduce friction to blister-causing shear.

I want to quote a blog post by Rebecca about Healing Foot Blisters Faster to help you understand more about friction and shear.

“You know friction is responsible for friction blisters. But I bet you think friction is rubbing. It isn’t. Friction is about grip. High friction means two surfaces grip together. Low friction means they don’t … they’re slippery.

“Here’s how friction is responsible for foot blisters … There is high friction in your shoe. There just is. This means your skin grips your sock; and your sock grips your shoe. All three surfaces grip together so your foot doesn’t slide around in your shoe.

But with every step you take, your bones are moving around under the skin. And while the skin is stuck and the bones are moving back and forth. Everything in between is pulled and stretched. This pulling and stretching is what causes blisters.

We call it shear. And it needs high friction to get anywhere near blister-causing.”

With this opening, Rebecca starts to explain the effect of shear and friction on blister formation. She talks about cutting friction levels, especially when a blister develops, and gives examples of six friction reducers. Some of these are better than others.

We have always tried to reduce friction in both preventing blisters and when treating blisters. As Rebecca says, and I support, “Otherwise all that stretching (shear) continues at the blister base while it’s trying to heal. Making it hurt more. And taking longer heal.”

So take a moment and click on the Blister Prevention link and read Rebecca’s full blog post. While you are there, I encourage you to subscribe to her email list.

The Heroes of Foot Care

December 12, 2014 by · Leave a Comment
Filed under: blister care, Foot Care, Health, Sports 

Many of you have participated in a 50-mile race, a 100-mile race, an adventure race, or some other type of multi-day race. Some multi-day races are non-stop while others are stage races. A lot of these races provide medical care at aid stations – and some also provide foot care.

If you have received foot care aid at these aid stations, you have been helped by the generous people I’ll call the “heroes” of foot care.

Foot Care Triage in the Amazon

Foot Care Triage in the Amazon

The picture shown here is from the Amazon Jungle Marathon this past October. Every one of the 15 members of our medical team helped with foot care. No one said they didn’t want to do feet. You can see the working conditions: sand everywhere, water bottles as footrests, a tarp to protect the runners and our knees (that quickly filled with sand), and supplies strewn all over and shared between medics. What you don’t see are the flies and bugs that were constantly in our faces, and the sweat running down our faces from the humidity. Now keep this up for hours, well into the night.

These are the heroes of foot care.

Most races have them. They volunteer their time and even supplies. They often go to races at their own expense. They work often under adverse and uncomfortable conditions. They want to do the best patch job possible. They are dedicated to getting you back into the race. They want you to have a great race experience. In short, they care.

I’ve been at races that have well-organized foot care services and others that have nothing. Some people providing their services are podiatrists, doctors, nurses, paramedics or EMTs, physical therapists, chiropractors, or other medical specialists. Other times they are simple people who have learned foot care techniques on their own or from someone else.

I know you appreciate these foot care people.

So how can you thank them? Let me share a few ideas.

  1. Simply say thank you.
  2. Make sure you have done everything possible to have healthy feet going into the race.
  3. Trim your toenails short and then file them smooth.
  4. Reduce calluses as much as possible.
  5. Wear quality shoes and socks.
  6. Know how to do your own foot care just in case we aren’t there or there’s a line for our services
  7. And finally, be patient. Good foot care and blister patching takes more than a minute.

We love helping runners and always welcome your appreciation.

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