Correlation Analysis Between Body Structure And Show Jumping Performance In 80 Cm Height Steeplechase

In this paper,20 obstacle racehorses were selected as test subjects,and the correlation between body size,limb angle and joint angle and gait characteristics of the four stages was investigated by measuring the obstacle racer’s 80 cm height barrier performance,as well as the correlation between static body structure parameters,obstacle crossing performance parameters and various scores.The 20 obstacle course horses were selected with basically the same body structure,and kinovea software was used to measure the parameters of each body structure at rest and the performance parameters of the obstacle crossing.The limb angle index and body size data related to the obstacle crossing performance were screened out,which provided a theoretical basis for the study of the body structure of obstacle racehorses.The regularity of the body structure and gait characteristics of excellent horses is analyzed,and a mathematical model for distinguishing excellent obstacle-crossing horses is fitted.The findings are as follows:The results of correlation analysis between body structure parameters and joint angles of jumping horses showed that: in the take-off stage,stifle joint angle and tibia-metatarsal angle were significantly negatively correlated with neck-ground angle（P<0.05）.There was a significant positive correlation between hand pitching angle and humerus length（P<0.05）.In the suspension stage,there was a significant positive correlation between the metatarsal-phalanx angle and the coxae-ground angle（P<0.05）.There was a significant positive correlation between the croup-ground angle and the length of the tibia（P<0.05）.In the landing stage,humeru-radius angle is highly significantly negatively correlated with coxae-ground angle（P<0.01）.The results of the correlation between the structural parameters and gait of the body shape of the obstacle racehorse show that the hand pitching angle and the stance trailing hindlimb are significantly positively correlated（P<0.05）at the time of take-off.There was a significant positive correlation between lumbar spine length and stance trailing hindlimb（P<0.01）.During the suspension phase,the metatarsal-phalanx angle and the swing leading hindlimb were significantly positively correlated（P<0.01）.During the landing phase,the hip inclination was significantly negatively correlated with the posterior anterior hoof support（P<0.05）.During the buffering phase,the hand pitching angle and the swing leading forelimb showed a significant positive correlation（P<0.01）.Through the evaluation and analysis of the comprehensive obstacle-crossing performance of steeplechase horses,the results show that: Shoulder-ground angle,metatarsal-phalanx angle,hip joint angle,coxae-ground angle,croup-ground angle,aerial duration,humerus length,tibia length,back length,withers height to the horse’s obstacle crossing time when crossing obstacles,the best score and the comprehensive score have a significant impact.The joint angle and gait clustering performance of horses with better obstacle-crossing performance is obviously concentrated,and these main joint angles can be used to establish the mathematics of discriminating between good and poor obstacle race horses.Model.Therefore,six discriminant functions of body structure parameters and obstacle crossing performance parameters are obtained.The functions are as follows:Y_Excellent=2.511X_{Shoulder-ground angle}+6.349X_{Femur length}+1.226X_{Tibia length}+4.039X_{back length}-325.09Y_Good=2.824X_{Shoulder-ground angle}+6.775X_{Femur length}+0.598X_{Tibia length}+4.271X_{back length}-342.613Y_Bad=3.217X_{Shoulder-ground angle}+7.402X_{Femur length}+0.514X_{Tibia length}+4.493X_{back length}-398.368Y_Excellent=3.448X_{Femur-ground angle}+6.965X_{Coxae-ground angle}+3.231X_{Metacarpu-phalanx anglet}+1.718X_{Hip joint angle}+6.103X_{Metatarsal-phalanx angle}+2918.819X_{Aerial duration}-1295.793Y_Good=3.389X_{Femur-ground angle}+6.654X_{Coxae-ground angle}+3.164X_{Metacarpu-phalanx anglet}+1.696X_{Hip joint angle}+5.941X_{Metatarsal-phalanx angle}+2780.805X_{Aerial duration}-1220.491Y_Bad=3.191X_{Femur-ground angle}+6.715X_{Coxae-ground angle}+3.116X_{Metacarpu-phalanx anglet}+1.555X_{Hip joint angle}+5.933X_{Metatarsal-phalanx anglet}+2843.627X_{Aerial duration}-1200.329The above results indicate that,through the analysis of body structure parameters and obstacle performance parameters of obstacle race horses,it is found that shoulder inclination,rear ball joint,hip joint,hip inclination,hip angle,flight period,humerus length,tibia length,the index data of back length and body height can be used as a standard for evaluating the excellent performance of jumping horses.This indicates that the joint angles of the elite jumping horses have more flexible extension and flexion,and that the elite horses have better neuromuscular control when crossing obstacles.Therefore,these index data can be used to select and breed excellent obstacle race horses.