Grip/Pinch Strength Lab Exercise
Introduction: Physical Ergonomics is the science and study of using appropriate work postures to reduce the strain on workers which in return will maximize productivity. This grip strength experiment measures the maximum grip strength capability and EMG generated between the neutral and flexed wrist position as well as between genders. The goal is to show how posture affects force capability, which affects worker performance as well as corresponding muscle activity. Therefore hand tool and job design should be designed accordingly as to maximize production.
* DataLog (Biometrics, LTD, Model W4X8), Bluetooth technology, to record data * Biometrics Data Analysis Software, Version 7.0, to analyze grip strength and EMG data * P100 Pinch grip dynamometer (Biometrics, LTD) to measure pinch grip strength (collected at 50 Hz) * G100 Power grip dynamometer (Biometrics, LTD) to measure power grip strength (collected at 50 Hz) * SX230W EMG electrode (Biometrics, LTD) to measure electrical muscle activity (collected at 1000 Hz) * R206 EMG ground strap electrode placed over the elbow (Biometrics, LTD)
Methods: The first step is to prepare the subject for the experiment. After letting the subject know what data you intend to collect and how you will collect it, you need to make sure there are no previous wrist or hand injuries such as carpel tunnel. If so, let the patient know that they are not eligible for testing because administering the experiment could lead to injury. After verifying that your patient is fully aware of the procedure and that there are no previous condition that could alter the experiment, prepare the subject.
Since this was a simple lab experiment, we did not clean or prepare the skin for subjects. If this was a more in depth lab, it’s suggested to fully clean