Activity Analysis: Opening the Refrigerator
I am going to analyze the movements involved in opening the refrigerator door. The start position to end position will be from the time I grab the refrigerator door to the time it is completely open. So, I will not be analyzing the movements that allow me to reach for the door prior to it opening, nor will I be describing the movements involved in closing the door. Also, I will not be letting go of the door in the end position. So, I will begin with flexion at the shoulder, MP, PIP, and DIP joints. I will also be in full extension at the elbow. I will now look more closely at each major joint.
Shoulder extension will be used from the start to end positions. This will be performed in the sagittal plane. In addition, this movement will be performed on the frontal axis of rotation. The next joint, elbow, will flex in the sagittal plane and on the frontal axis of rotation. Lastly, all of the phalangeal joints (3) will stay flexed as I will not be letting go of the door handle at the end position.
I will now talk about the kinematics of one joint, the elbow. First off, this will be looked at as more of a rotary movement than a linear. This means that we are dealing with the angles to which change from start to end positions. Also, it will be an open kinematic chain because the body is fixed allowing only the upper limb to move. When looking at the elbow in this activity it flexes. So, the osteokinematics of the movement are flexion of the radius and ulna in relation to the humerus. The arthrokinematics will involve the humeroulnar, and humeroradial joints. There will be an anterior roll and slide from both the radius and ulna in relation to the humerus. The humerus parts of the joints, the capitulum and trochlea, have a convex shape while the head of the radius and trochlear notch of the ulna both have concave features. This means that the roll and slide of the radius and ulna both move in the same direction, anteriorly.
Lastly I will discuss the prime movers of this activity. The latissimus dorsi will be the primary mover. It's activation will be concentric as it is contracting and the muscle fibers are shortening. So, this is the activity analysis for opening a refrigerator door. I hope you enjoyed and if you have any comments or questions please feel free to leave one!
Shoulder extension will be used from the start to end positions. This will be performed in the sagittal plane. In addition, this movement will be performed on the frontal axis of rotation. The next joint, elbow, will flex in the sagittal plane and on the frontal axis of rotation. Lastly, all of the phalangeal joints (3) will stay flexed as I will not be letting go of the door handle at the end position.
I will now talk about the kinematics of one joint, the elbow. First off, this will be looked at as more of a rotary movement than a linear. This means that we are dealing with the angles to which change from start to end positions. Also, it will be an open kinematic chain because the body is fixed allowing only the upper limb to move. When looking at the elbow in this activity it flexes. So, the osteokinematics of the movement are flexion of the radius and ulna in relation to the humerus. The arthrokinematics will involve the humeroulnar, and humeroradial joints. There will be an anterior roll and slide from both the radius and ulna in relation to the humerus. The humerus parts of the joints, the capitulum and trochlea, have a convex shape while the head of the radius and trochlear notch of the ulna both have concave features. This means that the roll and slide of the radius and ulna both move in the same direction, anteriorly.
Lastly I will discuss the prime movers of this activity. The latissimus dorsi will be the primary mover. It's activation will be concentric as it is contracting and the muscle fibers are shortening. So, this is the activity analysis for opening a refrigerator door. I hope you enjoyed and if you have any comments or questions please feel free to leave one!
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