How to find the stabilizer muscle for dumbbell bicep curl exercise?
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Adi S.
Synergists / Fixators / Supinators Question: Muscle or muscles that answer the question: Name any two muscles that stabilize the shoulder joint. This muscle is a synergist in flexion of the forearm and also stabilizes the elbow joint during rapid flexion and extension of the forearm. This muscle, besides being a flexor, supinates the forearm (performs the motion needed to turn a corkscrew and uncork a wine bottle).
A bodybuilder is in training and performs curls with a 10 -kg barbell to strengthen her biceps muscle. At the top of the stroke, her arm is configured as in Figure $\mathrm{P} 8.79,$ with her forearm at $35^{\circ}$ with respect to the horizontal. Approximate her forearm and hand as a uniform rod of mass 1.4 kg and length $32 \mathrm{cm}$ (from pivot point at the elbow to center of barbell). The biceps muscle is attached 3.1 cm from the pivot point at the elbow joint and produces a force that is directed $85^{\circ}$ away from the forearm. What force must the biceps muscle exert to keep the weight at its current position?
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