Gen Combo Ll Basic Biomechanics; Connect Ac; Maxtraq Software Ac
8th Edition
ISBN: 9781264013876
Author: Hall
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 13, Problem 2IP
Why does the orientation of a force acting on a body affect the amount of torque it generates at an axis of rotation within the body?
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A) Describe the difference between strength and power during a squat. Provide a quantitative example that illustrates the difference.
B) During a squat, the weight you have on your shoulders has a certain amount of gravitational potential energy. As you squat down and come to a stop at the bottom of the squat, some of that energy is lost. Where does it go?
Define the following parameters that can be assessed via isokinetic dynamometry (attempt to use your own words after reviewing data sheet):
Peak Torque
Time to peak torque
Angle of peak torque
Torque at 0.2 seconds
Peak torque/body weight
Total work
Work fatigue (Fatigue Index)
Average power
Which of the following is NOT true of an eccentric contraction?
Contraction produces a greater force than a concentric contraction.
Contraction is used as an acceleration activity.
Muscle attachments move farther apart.
Movement occurs with gravity.
Chapter 13 Solutions
Gen Combo Ll Basic Biomechanics; Connect Ac; Maxtraq Software Ac
Ch. 13 - Why does a force directed through an axis of...Ch. 13 - Why does the orientation of a force acting on a...Ch. 13 - A 23-kg boy sits 1.5 m from the axis of rotation...Ch. 13 - Prob. 4IPCh. 13 - Two people push on opposite sides of a swinging...Ch. 13 - Prob. 6IPCh. 13 - Prob. 7IPCh. 13 - Prob. 8IPCh. 13 - A 10-kg block sits motionless on a table in spite...Ch. 13 - Prob. 10IP
Ch. 13 - A 35-N hand and forearm are held at a 45 angle to...Ch. 13 - A hand exerts a force of 90 N on a scale at 32 cm...Ch. 13 - A patient rehabilitating a knee injury performs...Ch. 13 - A worker leans over and picks up a 90-N box at a...Ch. 13 - A man carries a 3 m, 32-N board over his shoulder....Ch. 13 - A therapist applies a lateral force of 80 N to the...Ch. 13 - Tendon forces Ta and Tb are exerted on the...
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- In grasping the load, how does the movement of the human hand compare with that of the myoelectric hand?arrow_forwardWhen holding an object, does the number of motor units remain the same? Are the same motor units used for the duration of holding the object?arrow_forwardIsometric exercise is best described as applying a force O a) with movement through a full and complete range of motion O b) while a muscle is lengthening and returning to a resting position c) without any change in length of the muscle O d) at a constant speedarrow_forward
- We move a lot and do not even realize how intricate these movements may be from gross motor to fine motor manipulations. Briefly explain the steps involved in a single muscle contraction beginning at the neuromuscular junction through one complete contraction and relaxation for the sliding filament theory. Don’t forget to include all the major proteins (actin, myosin, troponin and tropomyosin) involved as well as calcium and ATP.arrow_forwardGive an example of where circumduction but not rotation can occurarrow_forwardGive two example of 'curvature' movement?arrow_forward
- An isometric exercise is one in which the joint angle does not change during the application of muscle force. For instance, you can join your hands together, pushing down with one hand and pushing up with the other. In each arm, the muscles that provide the force are connected to the bones of the arm by tendons. If you increase the forces but keep the angles the same, the muscles will still contract. Explain how this is possible.arrow_forwardwhy does the force decrease later when multiple stimuli is injected with a constant value such as 8.5 volts. Why does muscles contract in such manner and force when stimulated multiple times.arrow_forwardIf the muscle fiber is stretched to 150% of muscle length and thentechnically stimulated, what would be the total force measured?arrow_forward
- Whenever the position of a joint is stabilized at a certain attitude, the nervous system produces this by :- a- increasing the α-motor neuron discharge to all muscles attached to the jointb- increasing the γ-motor neuron discharge to all muscles attached to the jointc- increasing γ-motor neuron discharge to postural musclesd- co-activation of α and γ-motor neurons innervating the involved musclesarrow_forwardIf your biceps brachii muscle attaches to your forearm 2 inches below your elbow, the distance from the elbow to the palm of your hand is 18 inches, and you lift a 20 pound weight, how much pull must your muscle exert to achieve elbow flexion? If your biceps brachii muscle attaches to your forearm 2 inches below your elbow, the distance from the elbow to the palm of your hand is 18 inches, and you lift a 20 pound weight, how much pull must your muscle exert to achieve elbow flexion? hhharrow_forwardIf an individual does training with only the right knee extensor muscles, it is common to see increase in strength in knee extension force for the right leg and an increase in strength in the knee extension force of the left leg (although the increase in force is typically not to the same extent as the force increase in the right leg) a.) True b.) Falsearrow_forward
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