Pasco Human Arm Lab Report

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A person can move his or her arm through flexion or extension of his or her elbow joint using his or her biceps and triceps which create tension forces about the elbow joint. This lab's objectives are to measure the tension and relative angles creates utilizing the biceps and triceps in a variety of situations. The purpose is to use this data to infer the effect of differing angles and using applied loads on necessary muscle force for certain situations.


A Pasco Human Arm Model was used to simulate the muscles and motion of an actual arm in this lab. Two built-in angle sensors measured the position changes in the shoulder and elbow. Cords were attached to the forearm and threaded through pulleys, to represent either the biceps or the triceps. Force sensors were attached to the cords or the model's hand, to measure the amount of force applied during the activities. Any recorded data was exported to a computer for analysis.

In activity 1, the shoulder was locked at 0°. A cord was attached to the standard biceps insertion point and threaded through the pulleys to simulate the biceps. A force sensor was attached to the free end of the cord, and another was attached to the model's hand. Measurements were recorded
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A force sensor was attached to the free end of the cord. An elastic cord was connected between the biceps insertion point and the upper shoulder pulley. The lower shoulder stop was set to hold the shoulder at about 130°, and the upper shoulder stop was moved all the way up. The model's wrist was turned all the way back, and a ball was placed in the model's hand. The elbow was set to about 90° and was held in place by pulling on the force sensor. Measurements were recorded as the force sensor was pulled to throw the ball. Tension was maintained as the arm was slowly lowered back to its starting
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