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- W3008161531 endingPage "e0219648" @default.
- W3008161531 startingPage "e0219648" @default.
- W3008161531 abstract "Background External loading of the ligamentous tissues induces mechanical creep, which modifies neuromuscular response to perturbations. It is not well understood how ligamentous creep affects athletic performance and contributes to modifications of knee biomechanics during functional tasks. Hypothesis/purpose The purpose of this study was to examine the mechanical and neuromuscular responses to single leg drop landing perturbations before and after passive loading of the knee joint. Methods Descriptive laboratory study. Male (n = 7) and female (n = 14) participants’ (21.3 ± 2.1 yrs., 1.69 ± 0.09 m, 69.3 ± 13.0 kg) right hip, knee, and ankle kinematics were assessed during drop landings performed from a 30 cm height onto a force platform before and after a 10 min creep protocol. Electromyography (EMG) signals were recorded from rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM), semimembranosus (SM), and biceps femoris (BF) muscles. The creep protocol involved fixing the knee joint at 35° during static loading with perpendicular loads of either 200 N (males) or 150 N (females). Maximum, minimum, range of motion (ROM), and angular velocities were assessed for the hip, knee, and ankle joints, while normalized EMG (NEMG), vertical ground reaction forces (VGRF), and rate of force development (RFD) were assessed at landing using ANOVAs. Alpha was set at 0.05. Results Maximum hip flexion velocity decreased (p < 0.01). Minimum knee flexion velocity increased (p < 0.02). Minimum knee ad/abduction velocity decreased (p < 0.001). Ankle ROM decreased (p < 0.001). aVGRF decreased (p < 0.02). RFD had a non-significant trend (p = 0.076). NAEMG was significant between muscle groups (p < 0.02). Conclusion Distinct changes in velocity parameters are attributed to the altered mechanical behavior of the knee joint tissues and may contribute to changes in the loading of the leg during landing." @default.
- W3008161531 created "2020-03-06" @default.
- W3008161531 creator A5016526427 @default.
- W3008161531 date "2020-02-21" @default.
- W3008161531 modified "2023-09-23" @default.
- W3008161531 title "Static loading of the knee joint results in modified single leg landing biomechanics" @default.
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- W3008161531 doi "https://doi.org/10.1371/journal.pone.0219648" @default.
- W3008161531 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7034804" @default.
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- W3008161531 hasPublicationYear "2020" @default.
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