Chapter 6 Laboratory Experiences

 

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1. With a partner, use a goniometer to measure the ankle range of motion for dorsiflexion and plantar flexion both when the knee is fully extended and when it is comfortably flexed. Explain your results.

Dorsiflexion ROM with full knee extension:

 ,

With knee flexion:

Plantar flexion ROM with full knee extension:

 ,

With knee flexion:

Explanation:

2. Using a series of dumbbells, determine your maximum weight for the forearm curl exercise when the elbow is at angles of 5°, 90°, and 140°. Explain your findings.

Max at 5°: , Max at 90°: , Max at 140°: 

Explanation:

3. Using electromyography apparatus with surface electrodes positioned over the biceps brachii, perform a forearm curl exercise with light and heavy weights. Explain the changes evident in the electromyogram.

Comparison of traces:

Explanation:

4. Using electromyography apparatus with surface electrodes positioned over the pectoralis major and triceps brachii, perform bench presses with wide, medium, and narrow grip widths on the bar. Explain the differences in muscle contributions evident.

Comparison of traces:

Explanation:

5. Using electromyography apparatus with surface electrodes positioned over the biceps brachii, perform a forearm curl exercise to fatigue. What changes are evident in the electromyogram with fatigue? Explain your results.

Comparison of pre- and post-fatigue traces:

Explanation: