Shoe Variation & Injury
There was recently a question on the Runner’s World forums about a calf strain and if it could be due to the runner only wearing one pair of shoes. I thought it interesting, so wanted to share the question and my answer below.
“I’ve been dealing with an overuse calf injury for 6 months now. I don’t want to blame the problem on my shoes, but could switching shoe models help alleviate an overuse problem?”
Certainly. Different shoes, different terrains, different paces, they all spread out the mechanical stress and force locations to different parts of the body in different ways. This allows all those areas of the body to experience less overall stress and to easily recover.
Think of a runner that does the same exact speed at the same exact incline for the same exact difference on a treadmill every day in the same shoes. They’re placing the exact same stresses in the exact same locations every day, not giving those areas time to recover. It would be like doing the bench presses every time, other muscle groups would never get any stimulation to strengthen and the pecs would never get any off time to strengthen, thus weakening and likely becoming injured. New shoes could change your running form slightly, which could place the stress at a new location of the calf and give that injured area a rest. Compression sleeves could potentially do the same.
That all being said, there’s still no reason to blame the shoes, it’s not their fault. You just may have made a slight error in not giving your body enough variability.
Potentially it could not have to do with a lack of variation at all. I recently dealt with a calf issue due due to tight hamstrings as a result of a weekend of lots of climbing and descending after living in the plains for two years. I spent a few weeks with reduced volume and no intensity, and now I’m A-OK . Of course, you could look at that as a lack of variation issue as well, because I was lacking variation in the plains which meant the mountains were too big of a stimulus (classic too much too soon). But I look at it as me being unmindful and overzealous on the vertical for a weekend.
I also feel that such variation can help a runner put more distance in individual shoes before they are required to retire a pair. As I said in Men's Journal, I typically run through my shoes for 800-1500 miles until they fall apart or I wear through the bottom. I believe different shoes, speeds, terrain, etc all change up how the feel and legs are loaded so you do not overload a certain area of the body. It works for preventing running injuries and I believe it works for shoe durability.
Imagine if you only ran in a single pair of shoes. Throughout the miles the sole under the big toe will compress and wear away, so every run you may be pronating a tiny bit more each time. Over the miles that pronation may become exaggerated. Now, pronation is natural and necessary, but over-pronation beyond what is healthy for you can be an issue. Performing an exaggerated degree of pronation for weeks/months due to shoe wear may be harmful, but wearing those shoes two or three times weekly along with another pair or two increases variability and can potentially be a healthy practice!
Can the parallel use of different running shoes decrease running-related injury risk? | “the parallel use of more than one pair of running shoes was a protective factor “