FIGURE 2. Variation in impact transients.

From the following article:

Foot strike patterns and collision forces in habitually barefoot versus shod runners

Daniel E. Lieberman, Madhusudhan Venkadesan, William A. Werbel, Adam I. Daoud, Susan D’Andrea, Irene S. Davis, Robert Ojiambo Mang’Eni & Yannis Pitsiladis

Nature 463, 531-535(28 January 2010)

doi:10.1038/nature08723

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a,b,Magnitude(a) and rate of loading(b) of impact transient in units of body weight for habitually shod runners who RFS (group1; open boxes) and habitually barefoot runners who FFS when barefoot (group3; shaded boxes). The rate of loading is calculated from 200N to 90% of the impact transient (when present) or to 6.2±3.7% (s.d.) of stance phase (when impact transient absent). The impact force is 0.58±0.21bodyweights (s.d.) in barefoot runners who FFS, which is three times lower than in RFS runners either barefoot (1.89±0.72body weights (s.d.)) or in shoes (1.74±0.45body weights (s.d.)). The average rate of impact loading for barefoot runners who FFS is 64.6±70.1body weights per second (s.d.), which is similar to that for shod RFS runners (69.7±28.7body weights per second (s.d.)) and seven times lower than that for shod runners who RFS when barefoot (463.1±141.0body weights per second (s.d.)). The nature of the measurement (force versus time) is shown schematically by the grey and red lines. Boxes,mean±s.d.; whiskers,mean±2s.d.

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