A lateral dumbbell raise, in what plane and about what axis is this movement occ

Question

A lateral dumbbell raise, in what plane and about what axis is this movement occurring? When performing a lateral raise, there are two torques produced. Why does the muscular effort required in a lateral raise increase as the weight is moved closer to a 90° angle? What could an individual do to make performing a lateral raise easier?

Let’s say that you have an itch on your back. In order to scratch that itch, you must reach behind your back. Along with extension and adduction of the glenohumeral joint, what action must occur at that joint in order for you to scratch that itch? In what plane does this movement occur and about what axis? List three muscles (along with one origin and insertion of each) that would produce the action.

Explanation / Answer

Lateral dumbbell raise is a side to side action where it takes place in frontal plane, sagittal or anteroposterior axis.

Moderate motive forces are enough to overcome resistive forces when load moves diagonal to the gravity i.e) 30° = effort is half load, 45° = effort is 71% load

Highest resistive forces are offered to agonists when load moves parallel to gravity. i. e) at 90°

Travellingbeyond 90º progressively decreases which will decrease the effort and make it easier.

On the other hand when we scratch the itch adduction and extension of the glenohumeral joint takes place along with abduction followed by extension and adduction of acromioclavicular joint, flexion of elbow ,wrist and MCP joints takes place.during this movement the frontal plane comes in action but on extension sagittal plane takes place.

The muscles involving this action is deltoid, pectoralis , trapezius and lattismus dorsi

Deltoid origin: lateral 3rd of clavicle, acromion and spine of scapula

Insertion:deltoid tuberosity

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