Chapter 6 The Muscular System 103 Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Name ________________________________________________________________ Procedure 1. Work with a partner to perform this activity. Establish who will be the videographer and who will be the gait subject. Also determine whether you will be analyzing the left or right lower limb gait cycle. Videographer:________________________________________________________________________________________ Gait subject:_________________________________________________________________________________________ □ Left □ Right Normal Gait In this part of the activity, you and your partner will study the characteristics of a normal gait. Understanding normal gaits can help you recognize abnormal gaits. 2. Find a space in which the gait subject will easily be able to complete two full gait cycles and the videographer will be able to record the cycles from both a lateral and an anterior view. 3. Record the gait subject completing two full gait cycles from a lateral view (Figure 6.5H). 4. Record the gait subject completing two full gait cycles from an anterior view (Figure 6.5I). 5. For the next round of recording, instruct the gait subject to walk very slowly to emphasize each phase of the gait cycle. Record first from a lateral view. While the gait subject is walking, the videographer should be annotating (talking) over the video. Annotations should include: A. Phase of the cycle observed B. Motions occurring at the hip, knee, and ankle C. Major muscle(s) or muscle groups active during the phase HINT Asking the gait subject to “freeze” in each phase of the gait cycle will allow you more time to discuss the phase and what is happening at each joint. Feel free to get creative with this project! 6. Repeat the recording from step 6 from an anterior view. 7. Together, review all of the videos and attempt to identify each phase of the gait cycle. A. Which muscle groups are activated in each phase? Indicate if they are concentric or eccentric contractions. Muscle Group Activation Iliopsoas Quadriceps Hamstrings Anterior Leg Muscles Posterior Leg Muscles Loading Response Mid-Stance Terminal Stance Figure 6.5H Figure 6.5I Saskia D. Richter, author (continued)