Basic Biomechanics
Basic Biomechanics
7th Edition
ISBN: 9780073522760
Author: Susan J Hall
Publisher: McGraw-Hill Education
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Chapter 8, Problem 3AP
Summary Introduction

To describe: The sequencing of contractions of the major groups of lower extremity during the gait cycle, indicating when contractions are concentric and eccentric.

Concept introduction: The alternate movement of the limbs in biphasic forward propulsion of center of gravity in bipedal fashion for locomotion is called as human gait. Human gait aids the human to move in for locomotion or for specialized training or for sports. Before civilization began, gait helped the human beings to hunt and gather food.

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Practice Problems 4 Q1: The quadriceps tendon attaches to the tibia at a 30-degree angle from the knee at a height of a*H where a is a constant and H is the height of the individual. The tendon attaches at a point between the knee and the COM of the lower leg. Additionally, a 100 N weight attached to the ankle. Solve the following parts of the problem while neglecting the weight of the foot but not the lower leg, the thigh is supported. A) Draw a free body diagram of the system. B) For an individual, W = 80 kg, H = 1.8 m, what is the magnitude of the gravitational force acting on the lower leg, and where does this force act (distance from the knee)? C) If this leg is maintained in a horizontal position, write parametric equations (i.e. you will not be able to solve this out numerically because a*H is unknown) for the force in the muscle and at the contact forces at the knee joint if static equilibrium is maintained. Simplify these equations as best as you can. D) Assuming the distance…
Topic: What does EMG activity look like and how does this change with increasing intensity of muscle contraction? What does the relationship between the biceps RMS EMG amplitude and contraction intensity suggest? If contraction of one skeletal muscle fibre produces electrical activity (i.e. EMG activity), what does the above relation imply? There are several factors that influence tension produced by a whole skeletal muscle. Which 2 factors are preliminary influencing the relationship between the Biceps RMS EMGamplitude and contraction intensity in the current task? Topic 2: How do muscle work together to perform coordinated movements? Describe the EMG activity in the triceps muscle during elbow flexion and what this activity represents. What might the purpose of this be? Topic 3: What is a stretch reflex? Stimulus that will evoke the reflex is a light tap on the patellar ligament. How will the light tap affect the length of the rectus femoris muscle? What effect would the…
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