ArticleFrontiers in sports and active living2026
Angle-torque relationship and muscular activity patterns during concentric contractions with a novel variable cam system.
Article in Frontiers in sports and active living, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Understanding the angle -torque relationship requires recognizing that torque can differ across contraction modes. This study aimed to analyze the performance of the Variable Moment Arm Cam® (VMAC®) by examining torque production and muscle activation during concentric leg extension contractions across the full range of motion (ROM) (100°-0°) and comparing them with those obtained using an isokinetic dynamometer. Methods: In total, 22 young men (20.55 ± 2.19 years; 175.41 ± 7.21 cm; 72.80 ± 9.90 kg; 18.00 ± 5.83% body fat; 23.63 ± 2.82 kg·m⁻ Results: The VMAC® system produced strength curves that closely matched those observed when using the isokinetic dynamometer across the initial and mid-ROM joint angles (100°-35°), peaking around mid-ROM (70°-65°). Muscle activity differed across conditions while the torque production remained similar. Conclusion: The VMAC® generated torque patterns comparable to isokinetic dynamometry, showing the strongest alignment at mid-ROM, supporting the use of this system to replicate natural human strength curves while highlighting the opportunity to refine cam geometry.
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