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Figure 8


Fig. 8. Calculated peak vertical force, normalised to total mass of the subject (including mass of horse, riding tack and rider) as a function of speed – assuming no shift in forelimb to hindlimb force distribution. Values are means + s.e.m. for forelimbs and means – s.e.m. (N=6 throughout) for hindlimbs (for clarity; indicated by different symbols) during level (0–2%) and incline (8–12%) galloping for the six horses. Peak forces were calculated from duty factor and Eqn 1 assuming no shift in forelimb to hindlimb impulse distribution from 57:43 on the level and incline. Quadratic lines of best fit (P<0.001) are shown. These were estimated for the population using mean data. Coefficients: forelimb level b0=3.358, b1=1.436, b2=–0.028, r2=0.51; forelimb incline b0=–7.271, b2=3.355, b2=–0.119, r2=0.70; hindlimb level b0=–2.615, b1=1.978, b2=–0.063, r2=0.53; hindlimb incline b0=–1.077, b1=1.668, b2=–0.052, r2=0.686.





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