John sitting on a table performs knee extensions with his right leg hanging over the edge...
John sitting on a table performs knee extensions with his right
leg hanging over the edge and a 12 kg weight attached to the right
ankle. The mass of his right shank is 4 kg and the length of the
shank is 0.47 m. The moment arm of the quadriceps is 0.05 m and the
center of gravity of the shank is in the middle.
When the knee is fully extended (i.e. the shank is horizontal),
what is the muscle force required by the quadriceps to hold the
position?
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John sitting on a table performs knee extensions with his right
leg hanging over the edge...
An athlete is planning performing some knee extension exercises. He sits on the end of a...
An athlete is planning performing some knee extension exercises. He sits on the end of a bench so that his legs dangle in the air. A mass was attached (25 kg) to their right ankle and then the right leg was held out straight (0 deg knee angle) and paused. If the length of their lower leg between the knee and ankle is 17 inches, and the moment arm of the quadriceps femoris is 20 mm. What is the force...
An ACL patient is doing leg extensions to strengthen his quadriceps muscles. With no additional weight...
An ACL patient is doing leg extensions to strengthen his quadriceps muscles. With no additional weight added, the patient's lower leg (shank+foot) has a mass of 6.25 kg. The center of mass of the lower leg segment is located 32 cm from the axis of rotation of the knee joint. The leg is flexed 25 degree down from horizontal. The quadriceps muscle acts through the patellar tendon, which inserts 5 cm from the axis of rotation of the knee joint...
PROBLEM 2 Knee Extension - The angular motion of the lower leg about the knee joint,...
PROBLEM 2 Knee Extension - The angular motion of the lower leg about the knee joint, and the forces and torques produced by the muscles crossing the knee joint during knee flexions and extensions have been investigated by a number of researchers utilizing different experimental techniques. One of these techniques is discussed here. Consider the person illustrated in Fig. 10.12. The test subject is sitting on a table, with the back placed against a back rest and the lower legs...
- you should be able to identify the name of the muscle for each exercise as...
- you should be able to identify the name of the muscle for each exercise as well as the location of the muscle on a diagram or model Exercise 11: Start lying on your back on a bench with a dumbbell in each hand. Extend your elbows so the dumbbells are straight up in front of you in a semi-supinated grip. Keeping your elbows extended, slowly abduct your arms at the shoulder and then adduct them back to the middle...
An ACL patient is doing leg extensions to strengthen his quadriceps muscles. With no additional weight added, the patient's lower leg (shank+foot) has a mass of 6.25 kg. The center of mass of the lower leg segment is located 32 cm from the axis of rotation of the knee joint. The leg is flexed 25 degree down from horizontal. The quadriceps muscle acts through the patellar tendon, which inserts 5 cm from the axis of rotation of the knee joint...
PROBLEM 2 Knee Extension - The angular motion of the lower leg about the knee joint, and the forces and torques produced by the muscles crossing the knee joint during knee flexions and extensions have been investigated by a number of researchers utilizing different experimental techniques. One of these techniques is discussed here. Consider the person illustrated in Fig. 10.12. The test subject is sitting on a table, with the back placed against a back rest and the lower legs...
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