Coordination variability reveals the features of the ‘independent seat’ in competitive dressage riders.

Overview

• This study examined how competitive dressage riders coordinate different parts of their bodies with the movement of a riding simulator during trot gaits.
• It aimed to understand how variability in coordination relates to rider skill, particularly the concept of an “independent seat” — the rider’s ability to stabilize their pelvis and trunk while other body parts move more freely.

Background and Purpose

• The rider’s ability to consistently coordinate their body with their horse’s movement is crucial for performance in equestrian sports, especially dressage.
• The concept of the “independent seat” is important in dressage; it refers to the rider’s skill in keeping the pelvis and trunk stable while allowing other body parts to move independently.
• This study investigated coordination variability between the vertical movement of a riding simulator and rotations of specific rider body segments (head, trunk, pelvis, left foot) during two types of trot: medium and extended.
• The goal was to understand how these segments coordinate with the simulator’s movement and assess differences due to gait type and competition level.

Methods

• Participants: 28 competitive female dressage riders.
• Equipment: Riding simulator to replicate vertical displacement similar to horse trot.
• Measurement: Pitch rotation of the rider’s head, trunk, pelvis, and left foot was recorded.
• Analysis: Statistical non-parametric mapping three-way repeated-measures ANOVA tested effects of:
• Gait type (medium trot vs extended trot)
• Competition level
• Segment (head, trunk, pelvis, left foot)

Key Findings

• Significant effects were found for gait type and segment on coordination variability, but not for competition level.
• In medium trot, coupling between the simulator and the pelvis showed significantly less variability compared to the simulator with the head, trunk, and foot.
• The head and foot demonstrated greater variability relative to the trunk and pelvis, indicating that these segments moved more flexibly in response to simulator vertical displacement.
• This pattern suggests riders use their trunk and pelvis to maintain stability in the saddle, while allowing the head and foot to adjust more freely.
• During the more demanding extended trot, the increased perturbations may reduce the independence of the rider’s seat, implying that riders need to stabilize more segments or have less freedom of movement.

Interpretation and Implications

• The low variability or stronger coupling of the pelvis to the simulator’s movement reflects the rider’s ability to keep the pelvis stable—an essential feature of the “independent seat.”
• Greater variability in the head and foot implies these parts adapt dynamically while the core body (pelvis and trunk) keeps the rider stable.
• The lack of significant differences based on competition level suggests that the coordination pattern observed may be common among competitive riders at different levels or that other factors influence skill beyond segment coordination variability.
• The finding that extended trot challenges the independent seat more indicates that different gaits demand varying stability strategies from the rider.

Conclusions

• This research highlights the importance of segment-specific coordination variability in understanding rider biomechanics in dressage.
• It supports the concept that the “independent seat” involves a stable pelvis and trunk with adaptive movement in other body parts.
• Training aimed at improving dressage performance could benefit from focusing on developing pelvic stability and appropriate dynamic movement of the head and foot during different gaits.
• Further research might explore how different rider skill levels, training methods, or real horse movements affect coordination variability and performance.