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Lecture 20

Kinesiology 2241A/B Lecture Notes - Lecture 20: Rectus Femoris Muscle, Biceps Femoris Muscle, Subtalar Joint

Course Code
Kinesiology 2241A/B
Thomas Richard Jenkyn

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Biomechanics 2241A
November, 17, 2017
Assignment #3
1. Stand at the ak of a partner. Plae your hand on your partner’s sapula. The partner slowly
abducts the arm over their head.
a) What movement of the scapula occurs?
Upward rotation of the scapula occurs.
b) When do you start to notice it (in degrees)?
You start to notice this upward rotation after approximately 90 degrees of abduction.
c) Why is this movement necessary?
This movement is necessary because without it, your shoulder would be prone to dislocation
every time you moved your arm above your head. By the scapula following the path of your arm,
it allows the head of the humerus to remain intact with the glenoid fossa.
d) What does it do to the glenoid fossa?
It rotates internally to face upwards with the scapula, essentially following the path of the arm.
2. Identify the hip and knee movements during the execution (force) phase of the following
activities: Are there two-joint muscles involved in the movements? Which joints do they cross?
How could two-joint muscles be related to injuries?
a) a whip kick in the breaststroke,
- The hip is externally rotating
- Knees are internally rotating going from knee flexion into knee extension for the whip portion
of the kick.
(b) mounting a horse, swinging the right leg over,
- Internal hip rotation
- knee flexion
(c) a football punt,
-Hip flexion
-Knee extension
(d) a headspring,
- Hip extension
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