Electromyographic and Kinematic Comparison of the Leading and Trailing Fore- and Hindlimbs of Horses during Canter.
Authors: St George Lindsay B, Clayton Hilary M, Sinclair Jonathan K, Richards Jim, Roy Serge H, Hobbs Sarah Jane
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Comparing muscle activation patterns and movement mechanics between the leading and trailing limbs during canter reveals distinct biomechanical roles that have important implications for training and injury prevention. Researchers collected three-dimensional kinematic and electromyography data from four major muscles (triceps brachii, biceps femoris, gluteal, and splenius) in ten ridden horses performing both left and right canter leads, using statistical parametric mapping and linear mixed models to identify significant between-limb differences. The trailing hindlimb demonstrated substantially greater gluteal activation and duration during stance, enabling enhanced hip extension and stifle flexion for propulsion, whilst the leading forelimb showed significantly greater protraction during swing through increased elbow flexion; notably, the splenius activated earlier during the leading forelimb's movement cycle, contributing to the pitching mechanics characteristic of canter. These findings underscore that leading and trailing limbs perform fundamentally different functional roles, demanding asymmetrical muscle engagement patterns throughout the stride cycle. Given these inherent biomechanical differences, practitioners should emphasise balanced training on both canter leads to develop symmetrical muscular strength across all limbs, enhance overall athletic performance, and reduce the risk of overuse injuries that commonly result from one-directional training.
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Practical Takeaways
- •Horses naturally recruit different muscle activation strategies between leading and trailing limbs during canter; trainers should prioritize balanced work on both leads to prevent asymmetrical muscle development and associated injury risks
- •The significant differences in muscle activity and joint kinematics between leading and trailing limbs highlight the importance of symmetrical training programs to maintain athletic performance and longevity
- •Equal exposure to both canter leads during ridden work helps ensure balanced development of muscular strength and may reduce compensatory strain patterns that predispose horses to overuse injuries
Key Findings
- •Trailing hindlimbs demonstrated significantly greater gluteal muscle activity and duration, facilitating increased hip extension and stifle flexion during stance phase
- •Leading forelimbs showed earlier splenius activation during their movement cycle, contributing to bilateral activation during diagonal stance and body pitching mechanisms
- •Leading limbs (both fore and hind) exhibited significantly greater protraction during swing phase through increased elbow and hip flexion respectively
- •Asymmetric muscle activation patterns between leading and trailing limbs justify equal training on both canter leads to develop symmetrical muscular strength and reduce overuse injury risk