The following exercises are to be performed in the sitting position with the elbow extended: • Perform shoulder flexion to 90o with a 5 lb. weight held in the hand or (apply resistance above the wrist) • Perform shoulder flexion to 90o with a 5 lb. cuff weight placed above the elbow or (apply resistance above the elbow) Which motion is easier to perform? Why?
Added by Melvin P.
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weight held in the hand. This is because when the weight is held in the hand, the lever arm (distance from the weight to the shoulder joint) is longer, which means the muscles don't have to work as hard to lift the weight. When the weight is placed above the Show more…
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Stand slightly farther than arm's length from a wall with your arms by your side and hands facing forward at shoulder-level height. Perform each of the following movements fully before proceeding to the next. When finished, you should be reaching with the palm of your hand straight in front of your shoulder to attempt contact with the wall. Your elbow should be fully extended with your glenohumeral joint flexed 90 degrees. Glenohumeral flexion to 90 degrees Full elbow extension Wrist extension to 70 degrees Full shoulder girdle protraction Analyze the movements and muscles responsible for each movement at the shoulder girdle, glenohumeral joint, elbow, and wrist. Include the type of contraction for each muscle for each movement.
Madhur L.
\bulletA good workout. You are doing exercises on a Nautilus machine in a gym to strengthen your deltoid (shoulder) muscles. Your arms are raised vertically and can pivot around the shoulder joint, and you grasp the cable of the machine in your hand 64.0 $\mathrm{cm}$ from your shoulder joint. The deltoid muscle is attached to the humerus 15.0 $\mathrm{cm}$ from the shoulder joint and makes a $12.0^{\circ}$ angle with that bone. (See Figure $10.70 . )$ If you have set the tension in the cable of the machine to 36.0 $\mathrm{N}$ on each arm, what is the tension in each deltoid muscle if you simply hold your outstretched arms in place? (Hint: Start by making a clear free-body diagram of your arm.)
You are doing exercises on a Nautilus machine in a gym to strengthen your deltoid (shoulder) muscles. Your arms are raised vertically and can pivot around the shoulder joint, and you grasp the cable of the machine in your hand 64.0 cm from your shoulder joint. The deltoid muscle is attached to the humerus 15.0 cm from the shoulder joint and makes a 12.0$^\circ$ angle with that bone ($\textbf{Fig. E11.22}$). If you have set the tension in the cable of the machine to 36.0 N on each arm, what is the tension in each deltoid muscle if you simply hold your outstretched arms in place? ($Hint:$ Start by making a clear free-body diagram of your arm.) Figure E11.22 (CAN'T COPY THE FIGURE)
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