Part I Hand Grip Strength 1. Connect the Hand Dynamometer to the Vernier computer interface. Open the file “16a Compare Grip Strength” from the Human Physiology with Vernier folder. 2. Zero the readings for the Hand Dynamometer. a. Hold the Hand Dynamometer along the sides, in an upright position (see Figure 2). Do not put any force on the pads of the Hand Dynamometer. b. Click the Zero button, . 3. Have the subject sit with his or her back straight and feet flat on the floor. The Hand Dynamometer should be held in the right hand. The elbow should be at a 90° angle, with the arm unsupported (see Figure 1). 4. Have the subject close his or her eyes, or avert them from the screen. 5. Click to begin data collection. After collecting 2 s of baseline data, instruct the subject to grip the sensor with full strength for the next 8 s. Data will be collected for 10 s. 6. Store this run by choosing Store Latest Run from the Experiment menu. 7. Repeat Step 2 − 5 with the left hand. 8. Determine the maximum and mean force exerted by your hands during a portion of the data collection period. a. Place the cursor over your graph at 4 s and click and drag to highlight both runs from 4 s to 8 s. b. Click the Statistics button, , to see the Statistics box. c. Check the boxes in front of Run 1 and Latest and click . d. Record the maximum and mean force for each run in Table 1. e. Close the Statistics box by clicking the × in the corner of the box. Figure 2
Grip Strength Comparison Human Physiology with Vernier 16 - 3 9. Work with your classmates to complete Tables 2 − 4. Note : In Table 4, round height to the nearest inch. Part II Pinch Strength 10. Open the file “16b Compare Grip Strength” from the Human Physiology with Vernier folder. 11. Have the subject sit with his or her back straight and feet flat on the floor, holding the Hand Dynamometer along the sides in the non-dominant hand (see Figure 3). Note : No additional force should be placed on the sensor by this hand. 12. Have the subject close his or her eyes, or avert them from the screen. 13. Zero the readings for the Hand Dynamometer. a. Hold the Hand Dynamometer along the sides, in an upright position. Do not put any force on the gray pads of the Hand Dynamometer.
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