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- W1976332663 abstract "Activation patterns in one- and two- joint muscles generally reflect their biomechanical role in movement control. Lower limb loss will affect the role played by individual muscles in limb control. The gastrocnemius (GAS) muscle is altered following transtibial amputation, relegated to a one-joint knee flexor. Little is known if activation of this muscle adapts to reflect its new role in selected tasks. PURPOSE: To examine activation patterns in cyclists with and without uni-lateral transtibial amputation. METHODS: Three intact cyclists (IC) and six amputee cyclists (AC) were studied. The subjects cycled (200 watts at 90 rpm) for six minutes with data collected during the last 30 seconds. Surface EMG electrodes (1 kHz) were placed on the right leg of an IC group and bi-laterally in the AC group on the Gluteus Maximus, Rectus Femoris, Vastus Medialis, Biceps Femoris, and GAS. Top dead center of the crank was defined as zero. EMG signals were pre-amplified and bandpass filtered (3db at 8 and 550 Hz), RMS was taken and the data were normalized to the maximum value determined within the dataset and averaged across all cycles. Peak intensity and activation duration were determined with respect to crank position. RESULTS: Muscles not modified by the amputation retained activation patterns similar to the IC group, albeit with higher variability. The amputated GAS shifted its peak activation (Table 1).TableCONCLUSION: The shift in GAS activation is more appropriate for a single joint knee flexor. The neuromuscular system adapted the amputated gastrocnemius muscle to reflect its altered biomechanical function. Supported by NIH Grant HD055180" @default.
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- W1976332663 date "2009-05-01" @default.
- W1976332663 modified "2023-10-16" @default.
- W1976332663 title "Activation Changes In The Gastrocnemius Muscle: Adaptation To A New Functional Role Following Amputation." @default.
- W1976332663 doi "https://doi.org/10.1249/01.mss.0000354161.24516.91" @default.
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