Fig. 5. Stride frequency as a function of speed. Values are means – s.e.m. for level and means + s.e.m. for incline (for clarity; N=6 throughout) of individual horse mean data for fore- and hindlimbs (indicated by different symbols) during level (0–2%) and incline (8–12%) galloping for the six horses. Quadratic lines of best fit (P<0.001) are shown. These were estimated for the population using mean data. Coefficients: level b₀=2.88, b₁=–0.202, b₂=0.012, r²=0.44; incline b₀=2.70, b₁=–0.158, b₂=0.010, r²=0.454.