The future of human speed: As fast as a pronghorn

January 23, 2010 at 2:31 am 2 comments

A new paper in the Journal of Applied Physiology suggests elite human sprinters may be able to reach speeds as great as 40 MPH. (For comparison, Usain Bolt reached speeds of 28 MPH in his world-record setting Olympic efforts). Here’s the abstract of “The biological limits to running speed are imposed from the ground up“:

Running speed is limited by a mechanical interaction between the stance and swing phases of the stride. Here, we tested whether stance phase limitations are imposed by ground force maximums or foot-ground contact time minimums. We selected one-legged hopping and backward running as experimental contrasts to forward running, and had seven athletic subjects complete progressive discontinuous treadmill tests to failure to determine their top speeds in each of the three gaits.

Vertical ground reaction forces (in body weights; Wb) and periods of ground force application (Tc; s) were measured using a custom, high-speed force treadmill. At top speed, we found that both the stance-averaged (Favg) and peak (Fpeak) vertical forces applied to the treadmill surface during one-legged hopping exceeded those applied during forward running by more than one-half of the body’s weight [Favg = 2.71 ± 0.15 vs. 2.08 ± 0.07 Wb; Fpeak = 4.20 ± 0.24 vs. 3.62 ± 0.24 Wb±sem] and that hopping periods of force application were significantly longer [Tc = 0.160 ± 0.006 vs. 0.108 ± 0.004 s].

Next, we found that the periods of ground force application at top backward and forward running speeds were nearly identical, agreeing to within an average of 0.006 s [Tc = 0.116 ± 0.004 s vs. 0.110 ± 0.005 s]. We conclude that the stance phase limit to running speed is imposed, not by the maximum forces that the limbs can apply to the ground, but rather by the minimum time needed to apply the large, mass-specific forces necessary.

ScienceToday has a great summary of the article here.

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Too much is never enough Manthropology: T8 could beat Usain Bolt

2 Comments Add your own

  • 1. Josh  |  January 23, 2010 at 2:23 pm

    funny! I just read a book last year called “Manthropology” where the author cites a study of an aboriginal hunting party where a guy with one leg was running as fast as Bolt!
    “Trackway 4 is that
    of a one-legged man moving at 21.7 km/hr, which seems incredible but is discussed”
    article by S Webb, Journal of Human Evolution…

    Reply
  • 2. Manthropology: T8 could beat Usain Bolt « playthink  |  January 25, 2010 at 7:23 pm

    […] Comments Josh on The future of human speed: As …jleeger on Predicting Olympic medal count…jleeger on Too much is never enoughJosh on If […]

    Reply

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Jason R. Atwood

I'm an avid trail runner and doctoral student at U.C. Berkeley who studies motivation and the relationship between the mind and body. This blog is a forum to share research, news, and musings about these topics of interest. More

Play is the beginning of knowledge.

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