Pre-landing quadriceps vibration improves single-leg landing mechanics under fresh conditions but fails after combined cognitive-physical fatigue

Li, Fengping and Sun, Dong and Song, Yang and Cen, Xuanzhen and Chen, Diwei and Li, Wenlong and Xiang, Liangliang and Gao, Zixiang and Jemni, Monèm and Gu, Yaodong (2026) Pre-landing quadriceps vibration improves single-leg landing mechanics under fresh conditions but fails after combined cognitive-physical fatigue. PHYSIOLOGY INTERNATIONAL, 113 (1). pp. 151-165. ISSN 2498-602X

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Abstract

Purpose: To test whether ultrasound-triggered pre-landing quadriceps focal vibration acutely improves knee mechanics and coordination during single-leg drop landings under fresh vs combined cognitivephysical fatigue. Methods: Twenty-four healthy males (25.4 ± 2.1 years; 175.0 ± 3.1 cm; 73.2 ± 4.9 kg) performed randomized‐crossover single-leg forward drop landings. Quadriceps vibration was off or ultrasonically triggered. Landings were tested pre- and post-combined fatigue (15 min dual‐task cognitive þ90 s burpees). Results: In the pre-fatigued state, vibration increased peak knee flexion angle by 2.67% (P 5 0.001) and knee flexion range of motion by 1.36% (P 5 0.008), reduced knee flexion work by 1.69% (P 5 0.024), peak vertical ground reaction forces loading rate by 6.67% (P < 0.001), peak patellar tendon force by 5.92% (P < 0.05), time to stabilization by 3.88% (P 5 0.003), and maximal diagonal line length by 2.32% (P 5 0.008). Post-fatigue, vibration increased determinism (P 5 0.023), Shannon entropy (P 5 0.041), and dynamic time warping distance (P 5 0.045) without significant kinematic or energetic changes. Conclusions: Pre-landing quadriceps vibration acutely enhances sagittal-plane landing biomechanics, increasing knee flexion, reducing eccentric work and impact loading, and improving adaptive coordination in fresh conditions, with no significant effects under combined fatigue.

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