The experimental setup includes: (i) an upper-limb powered exoskeleton (NESM), (ii) a visual interface, and (iii) a commercial EMG recording system (TeleMyo 2400R, Noraxon Inc., AZ, US).
Telemyo 2400r
Manufactured by Noraxon
Sourced in United States
The Telemyo 2400R is a wireless electromyography (EMG) system designed for clinical and research applications. It is capable of recording muscle activity data from multiple channels simultaneously. The device provides real-time data transmission and can be used to assess neuromuscular function.
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Lab products found in correlation
6 protocols using telemyo 2400r
1
Upper-Limb Exoskeleton and EMG Assessment
2
Electromyography Measurement of Leg Muscles
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Following shaving and skin preparation, bipolar Ag/AgCl electrodes (5 mm diameter, 20 mm inter-electrode distance) were positioned on VL and VM of the right leg according to SENIAM guidelines. Placement was in-line with the orientation of the underlying fascicles, and guided by the tattoos to ensure reproducibility from session to session. Raw EMG signals were amplified at a gain of 500 (bandwidth 10–500 Hz, common mode rejection ratio >100 dB, input impedance >100 MΩ, baseline noise <1 μV rms) and sampled at 2000 Hz. Raw signals were sent from a hip-mounted pack to a receiving box (Telemyo 2400R, Noraxon, Scottsdale, United States), then were relayed to an analog-to-digital converter (Micro1401, Cambridge Electronic Design, United Kingdom) and recorded by Signal 4.10 software (Cambridge Electronic Design, United Kingdom).
3
Electromyographic Analysis of Leg Muscle Activity
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Bipolar Ag/AgCl electrodes (5 mm diameter, 20 mm inter-electrode distance, common mode rejection ratio >100 dB, input impedance >100 MΩ, baseline noise <1 μV rms) were positioned following shaving and skin abrasion on the vastus lateralis (VL) and medialis (VM) of the right leg according to SENIAM guidelines. Raw EMG signals were sampled at 2,000 Hz and amplified at a gain of 500 (sampling bandwidth 10–500 Hz). Raw signals were sent from a hip-mounted pack to a receiving box (Telemyo 2400R, Noraxon, Scottsdale, USA), then were relayed to an AD converter (Micro1401, Cambridge Electronic Design, UK) and recorded by Signal 4.04 software (Cambridge Electronic Design, UK). Offline, EMG signals were band-pass filtered at 20–350 Hz and root mean square was obtained from approx. 65° to full leg extension (i.e., 180°) during dynamic leg press (1-RM and maximum power) actions. Values are taken from the best trials in each performance measure.
4
Isometric Leg Press and Back-Squat Protocol
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Silver-silver chloride surface electrodes (Ambu BlueSensor N, Copenhagen, Denmark, electrode size L 30 mm × W 22 mm, inter-electrode distance 20 mm, AC impedance 600 Ω) were attached to VL and VM muscles of the right lower limb to record sEMG. A Telemyo 2400R telemetric recording system (Noraxon Inc. Scottsdale, Arizona, USA) with a sampling frequency of 2,000 Hz was used for data collection (500 gain). The EMG signal was transmitted to a receiver box and then fed through an A/D converter (Cambridge Electronic Design Ltd., Cambridge, United Kingdom) to a computer where Signal 4.14 software (Cambridge Electronic Design Ltd., Cambridge, United Kingdom) was used for data recording and further analysis offline. The sEMG data were band-pass filtered (20–350 Hz). Maximum sEMG amplitudes of VL and VM were obtained from the root mean square over the 500–1,500 ms time period during the bilateral isometric leg press (sEMGLP) and the concentric phase of the back-squat with the load of 50% of 1-RM (sEMGSQ). Thereafter, VL and VM amplitudes were averaged (VL+VM/2) to represent the maximal sEMG of the knee extensors.
5
Isometric Leg Extensor Strength and EMG
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Maximal bilateral leg extensor strength was measured on the custom-built horizontal leg press (Biology of Physical Activity, University of Jyväskylä) at a knee angle of 107°. Muscle activity was recorded during the isometric strength testing from the agonist muscles, VL and vastus medialis (VM), of the right leg. Skin was prepared by shaving, scraping, and disinfecting. Thereafter, the electrodes were placed according to SENIAM guidelines ( 20 ). On the first time, the positions of the electrodes were marked on the skin by ink dots to ensure always the same location of electrodes in each measurement during the study ( 24 ). Electrodes were bipolar Ag/AgCl electrodes with 5-mm diameter and 20-mm interelectrode distance.
During the measurements, the raw signals were amplified (500 gain) at a bandwidth of 10-500 Hz, the sampling frequency was 3,000 Hz. Thereafter, the signals went through the transportable pack to the receiving box (Telemyo 2400R; Noraxon, Scottsdale, AZ) and then to an AD converter (Micro1401; Cambridge Electronic Design, United Kingdom) and recorded by Signal 4.04 software (Cambridge Electronic Design). Electromyography (EMG) signals were analyzed by a customized script. Maximum iEMG values were obtained at the contraction period of 500-1,500 milliseconds (ms). The highest values of the VL and VM were combined and expressed as a mean value.
During the measurements, the raw signals were amplified (500 gain) at a bandwidth of 10-500 Hz, the sampling frequency was 3,000 Hz. Thereafter, the signals went through the transportable pack to the receiving box (Telemyo 2400R; Noraxon, Scottsdale, AZ) and then to an AD converter (Micro1401; Cambridge Electronic Design, United Kingdom) and recorded by Signal 4.04 software (Cambridge Electronic Design). Electromyography (EMG) signals were analyzed by a customized script. Maximum iEMG values were obtained at the contraction period of 500-1,500 milliseconds (ms). The highest values of the VL and VM were combined and expressed as a mean value.
6
Neuromuscular Activation During Plantar- and Dorsiflexion
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Surface EMG from gastrocnemius lateralis, soleus, tibialis anterior were recorded with bipolar electrodes (AMBU BlueSensor N, Copenhagen, Denmark) with a 2 cm interelectrode distance. Electrodes were placed according to SENIAM recommendations (17) .
Before the placement, the skin was abraded with sand paper and cleaned with alcohol. If electrode impedance was higher than 8 kΩ the preparation was repeated. EMG (RMS) signals were acquired with a Telemyo 2400R (Noraxon, Scottsdale, AZ, USA) system. EMG-RMS values of 0-500 ms (RFD) and 500-1000 ms (MVC) from muscle contraction onset were computed for soleus, tibialis anterior and gastrocnemius lateralis muscles. To determine the level of coactivity, the ratio between tibialis anterior EMG-RMS amplitude during plantarflexion and dorsiflexion MVC tests was computed (26). Due to technical problems in EMG signal acquisition, the total number of subjects included in the analysis of the EMG-RMS amplitudes (RFD, MVC and co-activation) was reduced to 10.
Before the placement, the skin was abraded with sand paper and cleaned with alcohol. If electrode impedance was higher than 8 kΩ the preparation was repeated. EMG (RMS) signals were acquired with a Telemyo 2400R (Noraxon, Scottsdale, AZ, USA) system. EMG-RMS values of 0-500 ms (RFD) and 500-1000 ms (MVC) from muscle contraction onset were computed for soleus, tibialis anterior and gastrocnemius lateralis muscles. To determine the level of coactivity, the ratio between tibialis anterior EMG-RMS amplitude during plantarflexion and dorsiflexion MVC tests was computed (26). Due to technical problems in EMG signal acquisition, the total number of subjects included in the analysis of the EMG-RMS amplitudes (RFD, MVC and co-activation) was reduced to 10.
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