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Publication Date

Spring 2025

Degree Type

Thesis - Campus Access Only

Degree Name

Master of Science (MS)

Department

Kinesiology

Advisor

Li Jin; Yang Hu; Yue Luo

Abstract

Muscle fatigue is a known contributor to musculoskeletal injuries, yet few studies have examined. its effects during the lay–up phase in sports. This study evaluated how fatigue alters ankle, knee, and hip biomechanics during lay–up and landing. We hypothesized that fatigue would increase peak vertical ground reaction force (GRF), knee extension angle, and joint moments. Fourteen healthy males performed 3–step lay–ups and drop–jumps on force plates, before and after a fatigue protocol. Kinematic data were collected using an 8–camera Vicon system (100 Hz), and GRF data with two AMTI force plates (1000 Hz). Thirty–six reflective markers were placed on lower limb anatomical landmarks, and data were processed in Visual 3D. Paired t–tests (α = .05) in SPSS (V26.0) compared pre– and post–fatigue outcomes. For the joint kinematic outcomes, a significant difference was found in peak knee extension angle (degree) between pre-fatigue (6.75 ± 6.01) and post- fatigue (9.28 ± 6.52) conditions during the layup phase (p = 0.028). For the kinetic outcomes, a significant difference was found in peak ground reaction force (BW) between the pre-fatigue (3.31 ± 0.81) and post-fatigue (3.95 ± 1.05) conditions during the landing phase (p = 0.036). In addition, a significant difference was found in the peak negative joint work between the pre-fatigue (-0.34 ± 0.18) and post-fatigue ( -0.66 ± 0.43) conditions during the landing phase (p = 0.025). These results suggest fatigue impairs neuromuscular control and increases injury risk

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