Subjects were seated on a computerized controlled dynamometer (KinCom II, Chattecx Corporation, Chattanooga, Tennessee) with their knees flexed to 90° and the lateral femoral condyle aligned with the axis of the dynamometer. The tibia and thigh of the leg tested, pelvis and trunk were stabilized by the force transducer pad, thigh strap, seat belt, and straps crisscrossing the torso. Electrical stimulation was delivered by a Grass S88 stimulator equipped with a Grass model SIU8T stimulus isolation unit (Grass Instruments, West Warwick, Rhode Island). Two self-adhesive surface electrodes (7.6 × 12.7 cm; Conmed, Utica, New York) were placed in the usual manner (proximal electrode placed over the rectus femoris and distal electrode over the vastus medialis portions) to allow stimulation of the quadriceps femoris muscle [Stackhouse et al., 2000 (link)]. The stimulator was driven by a computer using customized software (Labview 4.0.1, National Instruments, Austin, Texas) to control the timing parameters of each stimulation pattern. Forces were recorded at a sampling rate of 200 Hz.
Grass model siu8t
Manufactured by Natus
The Grass model SIU8T is a signal interface unit designed to work with Grass electrophysiology systems. It provides eight channels for signal input and output. The core function of the SIU8T is to serve as an interface between the data acquisition hardware and the recording electrodes or stimulation devices.
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Lab products found in correlation
2 protocols using grass model siu8t
1
Quadriceps Muscle Stimulation Protocol
2
Quadriceps Muscle Stimulation and Fatigue Assessment
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Bipolar self-adhesive neuromuscular stimulation electrodes (7 × 10 cm) were placed over the distal-medial and proximal-lateral portion of the quadriceps muscle group, as reported previously [17 (link)]. Stimulation pulses were delivered using a Grass S88 stimulator with a Grass Model SIU8T stimulus isolation unit (Grass Technologies, West Warwick, RI). Stimulation pulses were 450 μs in duration and delivered at 100 Hz for 100 ms (10 pulses); voltage was set at 125 V. Participants were familiarized with maximum voluntary isometric contraction (MVIC). During MVIC testing, the burst of stimulation was applied. CAR was calculated: MVIC torque/(MVIC torque + Stimulation). The 30-repetition fatigue test (CAR30) was considered central fatigue. CAR was measured on only 40 of the subjects because data was collected on only the last 50 subjects entered in the study and because of inability of 10 subjects to complete protocol.
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