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Biomechanical Changes Related to Low Back Pain: An Innovative Tool for Movement Pattern Assessment and Treatment Evaluation in Rehabilitation

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Assessing Agreement in Lower-Body Joint Interlimb Asymmetries in Isometric, Dynamic, and Loaded Conditions.

Lily J Rosenblum^1,2, Mita Lovalekar¹, Brian J Martin¹

¹Neuromuscular Research Laboratory/Warrior Human Performance Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania.

Journal of Strength and Conditioning Research

|February 25, 2026

Summary

Inter-limb asymmetry (ILA) measurement varies by task, metric, and joint. Load increased ILA during jumps, but fatigue did not impact gait ILA, suggesting ILA is context-dependent.

Keywords:

gait kinematics kinetics lower extremity military personnel physical functional performance

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Area of Science:

Sports Medicine
Biomechanics
Human Movement Science

Background:

Inter-limb asymmetry (ILA) in movements can signal musculoskeletal and neuromuscular dysfunction.
Assessing ILA across various conditions is crucial for understanding functional limitations.

Purpose of the Study:

To measure agreement in ankle, knee, and hip ILA under isometric, dynamic, and loaded conditions.
To evaluate the impact of external load on kinetic and kinematic ILA during jumps.
To determine the effect of physiological fatigue on gait ILA.

Main Methods:

Twenty-two men underwent assessments for isometric strength, dynamic forces, and range of motion without and with a 9.7 kg load.
Tibial impact during aerobic capacity tests was measured pre- and post-fatigue.
Kappa coefficients were used to assess agreement between different ILA metrics and formulae.

Main Results:

Single-joint ILA showed good agreement across formulae (κ range: 0.412-1.00), but poor agreement with lower-body ILA.
A 9.7 kg load significantly increased ILA during countermovement and drop jumps.
Physiological fatigue did not significantly alter gait ILA.

Conclusions:

Inter-limb asymmetry is a task-, metric-, and joint-specific measure.
External load influences ILA during jumping tasks.
Normative baseline ILAs were estimated for military personnel.