When healthy young men perform Tai Chi movements with an elastic band, their elbows bend more and straighten less compared to when they perform a reverse fly motion with the same band.
Mechanism
Synthesis from 1 study
When you keep your elbow bent and move slowly against resistance, your bending muscles work more efficiently and your straightening muscles don’t need to activate much. This keeps your elbow bent and prevents it from straightening out.
Most probable mechanism
When the elbow stays bent during a slow, controlled movement with resistance, the muscles that bend the elbow work harder because the angle makes it easier to pull against the resistance, while the muscles that straighten the elbow don't need to work much because the joint isn't moving toward straight. This keeps the elbow bent and reduces any tendency to extend it.
The elbow joint is held in a sustained flexed position, increasing the mechanical advantage of the elbow flexor muscles relative to the joint axis.
Increased mechanical leverage enhances torque production by the biceps brachii, brachialis, and brachioradialis, leading to greater neuromuscular activation and force output.
Sustained flexion reduces the need for eccentric or concentric action by the triceps brachii and anconeus, lowering their recruitment and activation.
Slow, controlled movement velocity minimizes inertial forces and dynamic loads on the elbow extensors, further reducing their contribution to joint control.
Reduced extensor activation and sustained flexor dominance maintain a larger elbow flexion angle and prevent significant extension.
Evidence from Studies
Supporting (1)
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Contradicting (0)
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Gold Standard Evidence Needed
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