Electromyography (EMG) signals were recorded synchronously.From the upper trapezius muscle with a bipolar.Surface EMG configuration (Neuroline, 720 01-K Medicotest.A / S education lstykke, Denmark), and an interelectrode distance.Of 2 cm [35]. The electrodes were positioned according to.SENIAM guidelines [36]. The skin was abraded prior to.Applying the electrodes to ensure an impedance of less than.10 K Ω (typically the impedance was 1-2 K Ω). If the impedance.Was higher than 10 K Ω the procedure was repeated untilimpedance was less than 10 K Ω. The EMG electrodes were.Connected directly to small preamplifiers located near the.Recording site. The raw analogue EMG signals were led.Through shielded wires to instrumental, differentiation amplifiersWith a bandwidth of 10 - 400 Hz and a common mode.Rejection ratio better than 100 dB. Force and EMG signals.Were sampled synchronously at 1000 Hz using a 16-bit A / D.Converter (DAQ Card-Al-16XE-50 National Instruments,,USA) and stored on a laptop for further analysis.
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