In Greek mythology, Achilles was a mighty warrior who was said to be indestructible. You see, as a child he'd been picked by the gods to be a great warrior and they'd protected him by dipping him in a river and this ceremonial dipping was said to have left him impenetrable to his enemies' weapons. As the story goes, Achilles was eventually brought down by an arrow that pierced his heel and later lead to his death. Apparently when the gods had dipped him in the river, they held onto his heel and that was the only part of his body that was not protected by the water. From this tale we get the term "Achilles Heel" which refers to a person's weak spot. It's also the name of the large tendon on the back of the calf that joins the calf muscles to, you guessed it, the heel.
Achilles tendinitis is probably more common in other sports such as basketball but it does affect runners so it warrants a discussion here. It's another easy condition to treat if caught early and it's usually do a runner neglecting to do both of the calf stretches talked about below.
The Anatomy (images)
The Achilles tendon is an enormous tendon that joins the calf muscles (Gastrocnemius and Soleus) to the heel to allow us to stand on our toes, jump, push off during running, etc. You'll notice I mentioned two calf muscles. The gastroc is the outer calf muscle and it's the one that's visible when we stand on our toes. The soleus is a deeper, postural muscle. The gastroc crosses over the knee joint a bit so it's stretched when the knee is straight and the soleus doesn't cross the knee joint so it's stretched with the knee bent. For diagrams and photos of both stretches please see stretching. Also of note, if you are doing weights to strengthen your calves, calf raises with the knee straight (standing calf raises) will work the gastroc while calf raises with the knee bent (seated calf raises) will target the soleus.
Signs and Symptoms
What's Going On
For one reason or another, the calf muscles have shortened to some degree and this causes too much tension in the Achilles tendon and it reacts by getting inflamed. This will often be the result of spending too much time in shoes with high heels (even a 1 inch heel). When one wears heels, this allows the calf muscles to relax and over time the tendon will begin to shorten. Some women who wear heels exclusively will not be able to walk barefoot because their tendons have become chronically short.
But most runners get problems because they forget to stretch the soleus muscle. They stretch the gastroc but not the soleus. This causes things to shorten slowly and that's why tendinitis develops. It will often develop after running up hills because as we run up hills the calves are being stretched and this will aggravate tight calves. This is similar to the person who tries to run for any extended period of time in cross-trainers. They just aren't made for distance running. That is, they don't have the same shape to the sole that a classic running shoe does. If you look at a running shoe, you'll notice that it has quite a high heel compared to the toe. It looks like it's built on a wedge. This eases the stress on the Achilles. Cross trainers are much flatter on the ground and therefore not suitable for running. Now, if your running shoe is too old and worn out the heel may have lost some or all of it's padding and this can lead to Achilles problems as well. when in doubt, replace your worn out shoes. Often that's all the treatment required.
Achilles Tendinitis may also be due to some faulty foot mechanics. This is often beyond the scope of home treatment and requires a professional to address gait, foot biomechanics, etc.
What To Do About It
Unless you have faulty foot mechanics you should be able to treat Achilles tendinitis on your own, providing you have caught it before it became chronic. If you've been neglecting to do both calf stretches that's the best place to start. Here are a few other things to try:
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