Slide 1Slide 2Electromyography (EMG) – 7 Measurement/InstrumentationElectromyography (EMG) – 8 SummaryStrength Measurement – 1 General Criteria for Device:Strength Measurement – 2 Whole Body Static StrengthStrength Measurement – 3 Whole Body Dynamic StrengthStrength Measurement – 4 Localized Static StrengthIntradisc Pressure Measurement -1Intradisc Pressure Measurement -2Intra-Abdominal PressureSeat Pressure Measurement -1 Tactilus (www.sensorprod.com)Seat Pressure Measurement – 2 Homebrew - FSR MatSlide 14Slide 15Slide 16IE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #10IE 5532IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #10IE 5533Electromyography (EMG) – 7Measurement/Instrumentation•Electrodes: Ag-AgCl, bipolar vs. unipolar•Preamplifier: ↑ input impedance, ↑SN ratio•Amplifier: –↑common mode rejection ratio–Bandwidth: 10-1,000 Hz–Variable gain (1 V for AD input)–Fuse: current limiting–Portable, not expensiveIE 5534Electromyography (EMG) – 8Summary•Estimate•Monitor•Timing•MedicalIE 5535Strength Measurement – 1General Criteria for Device:•Provide repeatable location for force•Disperse force over contact interface•Measure force in any direction•Should accommodate individuals with various anthropometries•Must sustain high loads•Must simulate industrial jobs•Needs a readout with: peak, 3-sec average, and analog output (A-D conversion)IE 5536Strength Measurement – 2Whole Body Static Strength• Lifting: adjustable cable, load cell, readout• Push/pull: adjustable handle on rack, load cellIE 5537Strength Measurement – 3Whole Body Dynamic Strength•Isokinetic dynamometer (constant velocity)•Load cell•Standardized tests•Mini GymIE 5538Strength Measurement – 4Localized Static StrengthKey: Isolate specific muscle group/jointIE 5539Intradisc Pressure Measurement -1• Nucleus pulposus = 80% water• Pressure increases with loading• Andersson, Nachemson, Örtengren, Elfström, 1970sSato, 1999IE 55310Intradisc Pressure Measurement -2IE 55311Intra-Abdominal PressureRadio pillCatheterIE 55312Seat Pressure Measurement -1Tactilus (www.sensorprod.com)Pressure MapPressure MatIE 55313Seat Pressure Measurement – 2Homebrew - FSR MatNonlinearitySensor deathIE 55314Stature Measurement (Stadiometry)IE 55315Force PlatformIE 55316Vibration
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