Dual ag agcl surface electrodes

EMG data were collected telemetrically during all MVC and UL-CMJ tasks. The skin was carefully prepared by shaving and cleaning with alcohol. Dual Ag/AgCl surface electrodes (Noraxon, Scottsdale, AZ, USA) were positioned on the GM of the jump leg, on the QL, and the lumbar ES on the side opposite the jumping leg. EMG electrodes were positioned on ES and GM muscles according to SENIAM recommendations (www.seniam.org, accessed on 3 May 2021). For QL, we followed the methodology of Monteiro et al. [14 (link)]. EMG signals were collected (Noraxon, Scottsdale, AZ, USA, sampling frequency: 2000 Hz) and the raw data were processed with the root mean square technique, using a 50-ms moving window. EMG data were filtered using a 20 to 500 Hz bandpass filter.

During the balancing trials, EMG data were collected telemetrically. The skin was carefully prepared by shaving and cleaning with alcohol. Dual Ag/AgCl surface electrodes (Noraxon, Scottsdale, United States of America) were positioned on eight lower extremity muscles, namely tibialis anterior (TA), peroneus longus (PL), soleus (SOL), gastrocnemius medialis (GastM), biceps femoris (BF), vastus lateralis (VL), vastus medialis (VM), and gluteus medius (GM). EMG electrode positioning on the muscles was carried out by the SENIAM recommendations (www.seniam.org). The input impedance for our EMG amplifyer was >100 Mohm. The common-mode rejection radio was >100 dB. Interelectrode distance was 20 mm. Electrodes were kept in their place throughout the balance tests. EMG signals were collected (Noraxon, Scottsdale, United States of America, sampling frequency: 2000 Hz), band pass filtered (20–500 Hz), and processed with the root mean square (RMS) technique, using 50-m moving window. For each muscle, the mean RMS EMG activity was thereafter calculated considering the entire 10-s-long trial.

EMG data were collected telemetrically during all MVICs. The skin was carefully prepared by shaving and cleansing with alcohol. Dual Ag/AgCl surface electrodes (Noraxon, Scottsdale, AZ, USA) were positioned on the tibialis anterior (TA), gastrocnemius medialis (GM), and gastrocnemius lateralis (GL) muscles according to the SENIAM recommendations (www.seniam.org). EMG signals were collected (Noraxon, Scottsdale, AZ, USA, sampling frequency: 2000 Hz) and the raw data were processed with the root mean square (RMS) technique, using a 50 ms moving window. Then, the peak EMG values were determined for every MVIC trial. (Figure 3).