Bit confused about how to activate the biceps after reading exRx.nets comments on Bicep & Brachialis activation during common 'bi' exercises.
It says, "During a dynamic elbow flexion, the biceps is more readily activated than the brachialis. Alternatively, the brachialis becomes more readily activated during isometric elbow flexion."
to me that makes sense.. but when looking at the exercises where the target muscle is the Biceps and where the target is the Brachialis, is where I get confused.
eg. A barbell curl targets the Bicep with the Brachialis assisting. Conversely a Preacher curl with barbell targets the Brachialis with the Bicep assisting.
If you do the barbell curl with strict form how is this movement dynamic (and hence, "brachialis becomes more readily activated") ??
Is it just because the elbow can travel 'slightly' during the movement mo matter how hard you try to keep it 'tucked in and stationary' ??