Can a midfoot strike cause Achilles tendonitis?

A few days ago I read an article at Science of sport about whether heel-, midfoot- or forefoot-strike were most efficient in running.

http://www.sportsscientists.com/2008/04/running-technique-footstrike.html

It was very interesting and made me think of my present situation with injury and everything. Since 2009 I’ve believed that a midfoot strike is the best, no matter what speed. Now I guess some of you will go “I can’t believe this guy! Hey honey, have you heard?…” But since I haven’t had any injuries until recently I haven’t thought it to be bad at least.

But it makes sense – I have pressed myself  hard in very short time. I did that during the spring when I ran races with short time in between and at the same time  increased my speed. midfoot strike would make the calfs work hard making them tight. If I always run like that even on the easy runs maybe the calfs never get to rest enough. At least it could be an explanation to my injured achilles.

Anyway, I thought it couldn’t hurt to try to adjust my strike a little. So on my last run I forced myself to land on the heel. Just slightly, hardly noticable. Though I did feel a great difference. For the first time I felt the cushion in my very flat Adidas Adizero CS 🙂 And also, I didn’t get a single niggle. Afterwards my calfs weren’t one tenth as tight as they usually are. It was even hard to get anything out of stretching them. I also noticed that my cadence still didn’t change. I were at 90 strides / min. The thing is, I’ve read that at a stride of 90 you force yourself to land on the midfoot. Well, according to the article above I guess that is only applicable if you run fast enough. It would be very interesting if they would film one of the elites running slowly (like I do) to examine how they land.

Since my little experiment worked so fine I will try it again on Saturday 😉

Tue 12 July – Easy run in fuzhou

41:04 – 8.12 km – 5:04 min/km – 150 in avg hr