Modelling rein tension during riding sessions using the generalised additive modelling technique
Authors: A. Egenvall, A. Byström, L. Roepstorff, M. Rhodin, M. Eisersiö, H. Clayton
Journal: Comparative Exercise Physiology
Summary
# Editorial Summary Rein tension during ridden work contains valuable information about horse-rider interaction and the horse's biomechanics, yet the inherent variability of real-time data has made pattern detection difficult until now. Researchers applied generalised additive modelling—a statistical technique designed to extract meaningful trends from complex longitudinal datasets—to analyse rein tension measurements collected at 128 Hz across complete flatwork training sessions in 17 horses ridden by six riders, calculating minimal and maximal tension values and area under the tension curve (AUC) for each stride. Across all horses, mean minimal tension was 8.0 N, AUC 180 Ns, and maximal tension 49 N; critically, tension consistently increased from walk (lowest) through trot to canter (highest), and 12 of 17 horses demonstrated systematically elevated tension in the right rein throughout their sessions. This modelling approach successfully converted chaotic raw signal data into visually interpretable patterns, revealing that individual horses maintain consistent rein tension profiles within their own movement, suggesting that asymmetrical rein contact—such as the predominant right-rein elevation observed—may reflect underlying biomechanical or postural asymmetries worth investigating. For practitioners, these findings indicate that rein tension analysis tools could help identify habitual contact patterns and asymmetries that might benefit from targeted retraining, physiotherapy, or farriery interventions.
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Practical Takeaways
- •Right rein dominance in tension is common (71% of horses) and may warrant asymmetry assessment in your riding position or horse's straightness
- •Rein tension increases predictably with gait speed (walk < trot < canter), providing objective baseline data for evaluating contact consistency
- •Individual horses show consistent rein tension patterns within sessions, allowing trainers to detect changes in responsiveness or contact quality as indicators of training progress or potential issues
Key Findings
- •Mean rein tension values were MIN 8.0±7.7 N, AUC 180±109 Ns, and MAX 49±31 N across all horses
- •Rein tension was lowest in walk, intermediate in trot, and highest in canter across horses
- •12 of 17 horses (71%) systematically showed higher tension in the right rein throughout sessions
- •GAM-modelling successfully extracted interpretable patterns from rein tension time-series data, revealing that MIN, AUC and MAX follow consistent patterns within individual horses