McLaughlin R M, Gaughan E M, Roush J K, Skaggs C L
Department of Clinical Sciences, Kansas State University, Manhattan 66506, USA.
Am J Vet Res. 1996 Jan;57(1):7-11.
The objective of the study reported here was to evaluate the effects of changing velocity on stance time and ground reaction force (GRF) measurements in horses at the walk and trot.
Force plate gait analysis was used to evaluate clinically normal horses at variable velocities. Ground reaction force measurements and stance times were recorded and compared.
12 adult horses.
Data were obtained from 192 valid trials at the walk and 162 valid trials at the trot. Vertical, braking, and propulsive peak forces and impulses were measured. Pearson's correlation coefficients were determined for velocity and stance time and all measured forces and impulses in the forelimbs and hind limbs. Trials were divided into distinct velocity ranges. Trials obtained at velocities within the established ranges were analyzed to evaluate changes in vertical, braking, and propulsive peak forces and impulses at differing speeds within the walk and trot gaits.
At the walk and trot, a significant negative correlation was found between velocity and forelimb and hind limb stance times. Velocity and stance time were significantly correlated with many of the GRF and impulse measurements. Velocity was significantly correlated with vertical and braking forces in the hind limbs at the walk, with vertical force in the forelimbs at the trot, and with braking force in the forelimbs and hind limbs at the trot. Velocity and stance time correlated significantly with forelimb and hind limb vertical impulses. Forelimb and hind limb stance times decreased significantly as velocity increased. Hind limb braking force increased and forelimb and hind limb vertical impulses decreased significantly as walk velocity increased. Forelimb braking force increased significantly between velocity ranges at the trot.
Results of this study confirm that a significant negative linear correlation exists between subject velocity and stance times in clinically normal horses at the walk and trot. Significant correlations were also identified between velocity and many GRF measurements, indicating that subject velocity does influence the generation of GRF measurements in horses. Variation in subject velocity should be minimized when performing force-plate analysis in horses.
本文报告的研究目的是评估速度变化对马匹在慢步和快步时站立时间和地面反作用力（GRF）测量值的影响。
使用测力台步态分析来评估不同速度下临床正常的马匹。记录并比较地面反作用力测量值和站立时间。
12匹成年马。
从192次有效的慢步试验和162次有效的快步试验中获取数据。测量垂直、制动和推进峰值力及冲量。确定速度与站立时间以及前肢和后肢所有测量力及冲量之间的皮尔逊相关系数。试验分为不同的速度范围。分析在既定范围内速度下获得的试验，以评估慢步和快步步态中不同速度下垂直、制动和推进峰值力及冲量的变化。
在慢步和快步时，速度与前肢和后肢站立时间之间存在显著的负相关。速度和站立时间与许多地面反作用力和冲量测量值显著相关。在慢步时，速度与后肢的垂直和制动力显著相关，在快步时与前肢的垂直力显著相关，在快步时与前肢和后肢的制动力显著相关。速度和站立时间与前肢和后肢垂直冲量显著相关。随着速度增加，前肢和后肢站立时间显著减少。随着慢步速度增加，后肢制动力增加，前肢和后肢垂直冲量显著减少。在快步时，前肢制动力在速度范围之间显著增加。
本研究结果证实，在临床正常的马匹慢步和快步时，受试者速度与站立时间之间存在显著的负线性相关。速度与许多地面反作用力测量值之间也存在显著相关性，表明受试者速度确实会影响马匹地面反作用力测量值的产生。在对马匹进行测力台分析时，应尽量减少受试者速度的变化。
