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. Author manuscript; available in PMC: 2016 Oct 1.
Published in final edited form as: Med Eng Phys. 2015 Aug 4;37(10):929–936. doi: 10.1016/j.medengphy.2015.06.010

Figure 2.

Figure 2

Data processing. (A) For each stride k, a local forward direction was defined by the best fit (total least squares) line through footfalls k-3 through k+3. (B) With respect to this line, measurements were defined for forward foot placement sk, lateral foot placement wk, and angular foot placement Ψk. (C) Stride period Tk was defined by sequential threshold crossings of horizontal plane velocity magnitude, with a threshold value of 0.2 m/s.