The MP150 Data Acquisition System (BIOPAC Systems Inc., USA) was used to record the cardiac activity during the heartbeat-tracking task. Disposable pre-gelled Ag-AgCl electrodes (diameter 35 mm, EL502, Biopac Systems) were placed below the right clavicle and below the left lower rib to perform the standard precordial lead II electrocardiogram (ECG; ECG100C; 0.5 Hz high pass filtering, R-wave output mode, signal gain 500). Subjects were grounded through a similar electrode positioned below the right lower rib. ECG recordings were continuously computed during the heart rate perception measure. Physiological data collection and offline analyses of the frequency of the recorded R-waves were realized with the AcqKnowledge Software package (BIOPAC Systems Inc., USA).
El502
Manufactured by Biopac
The EL502 is a reusable electrode lead that is used for electroencephalography (EEG) and other biopotential recording applications. It features a snap-on connector and a lead wire that is 1.5 meters long.
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Lab products found in correlation
2 protocols using el502
1
Cardiac Activity Monitoring during Heartbeat Tracking
2
Surface EMG Measurement of Lower Limb Muscles
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Surface electromyography (EMG) was recorded during each MVIC for the knee extensors and flexors using bipolar pre-gelled Ag-AgCl self-adhesive disk electrodes (EL-502; Biopac Systems, Inc., Santa Barbara, CA) with a center-to-center interelectrode distance of 20 mm. The electrodes were placed on the rectus femoris muscle for the knee extensors at 50% of the distance between the anterior superior iliac supine and the superior border of the patella and on the biceps femoris muscle for the knee flexors at 50% of the distance between the ischial tuberosity and the lateral epicondyle of the tibia. The ground electrode was placed on the tibial tuberosity. Prior to electrode placement, an approximate 8 ´ 8 cm area on each electrode application site was cleaned with an isopropyl alcohol pad.
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