90 Steps per Minute: Structural Dynamics of Marathon Running

 418559_218559227_Medium500 feet to go – Don’t fall down now!

Many of you who read my earlier blog entry, 26.2: The Engineering of Marathon Racing, are aware that I was training for the Chevron Houston Marathon.  To those who wondered how I fared, I am proud to say that on January 17 I completed my first (and last!) marathon with flying colors.  If anyone is looking for a challenge in life, I cannot recommend a more rewarding experience than taking on your first marathon.

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26.2 miles is a long time to be out on the road, a long time with nothing to do – besides putting one foot in front of the other 42,000 times – but people watch (after all there were 13,500 other equally crazy people huffing and puffing in front of me).  People watching is the easy part, since marathon runners tend to skew toward the physically fit and the attractive, with nearly half of the runners being women.  As I watched lady after lady run past me over the course of several hours, I gradually realized that a marathon could provide a perfect teachable moment for any engineer interested in better understanding structural dynamics.

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26.2: The Engineering of Marathon Running

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With 50,000 runners stepping with 475-lb force
3 times per second, it’ll be time to fix the roads!

Huff…owww…puff…ouch…pant.  Just nine miles to go this morning…that’s just 18,000 steps…

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I am writing this entry from New York City, where the 45th NYC Marathon will take place this Sunday.  On that date, 50,000 hardy souls will run 26.2 miles through the streets of NYC’s 5 boroughs.  For some of these 50,000, a marathon is a regular event (for example, 69 year old Larry Macon set a record by running 239 marathons in 2013).  For others, it will be a first time try – which may end up being the first of many (who knows, maybe there’s a future Larry Macon in the bunch), or it might simply be a onetime only thing, meant to check off one more item on a bucket list. Continue reading