Moment Arms Elbow Extended Elbow Flexed Muscle Neutral Supinated Neutral Supinat

Question

Moment Arms Elbow Extended Elbow Flexed Muscle Neutral Supinated Neutral Supinated Flexor Biceps brachii Brachialis Brachioradialis 1.47 0.59 2.47 1.96 0.87 2.57 3.43 2.05 4.16 3.2 1.98 5.19 Extensor Triceps brachii 2.81 2.56 2.04 1.87 An et al. (1981) a. Characterize how each muscle's moment arm changes & influences the b. For the flexor muscles, what position (Extended vs. Flexed) in a biceps C. During push-ups to fatigue, individuals often fail in one of the two above torque about the elbow joint in each position curls has the most torque required (i.e., which position is most difficult)? positions (Extended vs. Flexed). Identify the position using sound biomechanical terminology about torques (or moments of forces)

Explanation / Answer

Answer A)

Answer B)

Biceps Brachii is has the maximum efficiency in full supinated forearm and elbow flexed to 90deg. The position which becomes most difficult is exactly the opposite of it, i.e. - full pronation and elbow extended.

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