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- W2002991570 abstract "Recent work on patello-femoral dysfunction (PFD) showed that the vastus medialis distal fibres (VMdf) are more active at 90° of knee flexion. Peripheral reflex control was also shown to affect voluntary muscle activity. Hence, in our efforts to further understand the mechanisms responsible for VMdf activity, crucial to PFD management, this project investigated the effects of variations in the dynamic knee position and the foot position on the excitability of the quadriceps motoneuron pool, measured by H-reflex modulation. The VMdf H-reflex was studied in 8 normal subjects during the extension phase of cycling. Reflexes were quantified with the knee in 3 dynamic positions: 30°, 60°, and 90° of flexion. Foot position was also studied under 3 conditions using foot orthotics: barefoot (BF), neutral(NEU), pronation (PRO). H-reflex and M-response were recorded from EMG signal of VMdf as elicited by stimulating the femoral nerve at an intensity corresponding to 10% of the maximal M-response (Mmax). For all knee angles and foot positions, the H-reflex was normalized as a percent of Mmax. The figure shows that the VMdf H-reflex was significantly increased (p<0.05) by at least 15 times at 90° when compared to the other knee angles. No significant foot position differences(p>0.05) were found. This reflex modulation project suggests strongly that the EMG activity profile of the VMdf of being more active in flexion is driven by spinal mechanisms. Peripheral feedback would then play an important role in the activity pattern of the VMdf muscle." @default.
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- W2002991570 date "1996-05-01" @default.
- W2002991570 modified "2023-10-01" @default.
- W2002991570 title "THE EFFECTS OF DYNAMIC KNEE POSITION AND FOOT POSITION ON H-REFLEX MODULATION OF HUMAN QUADRICEPS 386" @default.
- W2002991570 doi "https://doi.org/10.1097/00005768-199605001-00386" @default.
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