Answer Happy

I. Muscle-pull Analysis 1. A muscle is attached distal to the hip. Its line of pull is located inferior to the axis of rotation of the hip and is directed in a medial direction. a. What segment is moved: b. What motion occurs (what torque is created) at the hip: 2. Perform a lat pull and describe the GH joint adduction that occurs at the initiation of the pull (down) phase. Point of attachment: b. Location of the line of pull: c. Direction of pull: A muscle is attached proximal to the hip. Its line of pull is located anterior to the axis of rotation of the hip joint and is directed in a lateral direction. What segment is moved: b. What motion occurs (What torque is created) at the hip: A muscle is attached distal to the shoulder. Its line of pull is located posterior to the axis of rotation of the GH joint and is directed in a medial direction. a. What segment is moved: b. What motion occurs (what torque is created) at the shoulder: From a supine position, describe the force produced by the abdominals in causing the up phase of a sit-up. Point of attachment: b. Location of the line of pull: c. Direction of pull:

II. Vector Analysis Your client is sitting on a chair with their upper arm at their side and their elbow flexed 90°. They move their hand laterally while keeping the humerus in contact with the trunk. a. Name the osteokinematic motion that occurs at the GH joint. b. Name the plane in which and axis around which this motion occurs. c. Name the muscle group that creates this motion. d. Create a force to resist the motion for strengthening these muscles throughout the range of motion (ROM). Name the point of application, location, and its direction relative to the joint axis for the resistance force vector at the start of motion Point of application: Location: Direction: e. Name the point of application, location, and its direction relative to the joint axis for the muscle group force vector. f. Name the torque for each force. Muscle: Resistance: g. During the shortening (concentric) phase which torque "wins"; which torque is greater? h. During the lengthening (eccentric) phase of the strengthening exercise which torque "wins"; which torque is greater? i. Draw a vector diagram representing the segments, forces, and motions.

For problems 7-10, draw and describe (explain in writing) a vector analysis. Remember that a vector analysis includes point of attachment relative to the joint of interest (POA), location of the line of pull relative to the joint (LOC), direction of pull (DIR), and the resulting torque (t). It may also be beneficial to label the plane of motion which your drawing represents. 7. Demonstrate manual resistance of seated knee extension at initiation of motion. Muscle: POA: LOC: DIR: Resistance: POA: LOC: DIR: Demonstrate gravity resistance of knee extension when the lower leg is parallel to the ground. Muscle: POA: LOC: DIR: Resistance: POA: LOC: DIR:

9. Demonstrate manual resistance of GH joint ER with GH joint abducted 90° and elbow flexed 90° Muscle: POA: LOC: DIR: Resistance: POA: LOC: DIR: 10. Demonstrate manual resistance of GH joint abduction Muscle: POA: LOC: DIR: Resistance: POA: LOC: DIR:

Perform a task analysis of a person performing the task of moving from standing to sitting while pulling a chair forward on which to sit. Use the following table to record your answers. Joint Movement Plane / Axis Movement force Muscle group active Muscle action Muscle torque GH joints Spine Torso Hips Knees Ankles 12. Perform a task analysis of the "Up phase" of a push-up with wide hand placement. Use the following table to record your answers. Joint Movement Plane / Axis Movement force Muscle group active Muscle action Muscle torque GH joints Elbows