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Stability of biceps brachii MMax with one session of strength training
James L Nuzzo1,2, Benjamin K Barry1,2, Simon C Gandevia1,3
1Neuroscience Research Australia, PO Box 1165, Randwick, NSW, Australia, 2031.
Introduction:
The maximal compound muscle action potential (Mmax ) of biceps brachii is altered by 1 session of strength training. We examined whether the number of training sets in a session plays a role in this effect.
Methods:
Ten subjects completed 1 session of isometric strength training of the elbow flexors (2 sets, 75% maximal force with 1 arm; 12 sets with the other). Biceps Mmax was acquired in both arms before training, immediately after training, and every 5 min for 30 min.
Results:
Mmax area was initially potentiated after 2 (7.2%) and 12 sets (13.6%) but returned to baseline within 5 min.
Conclusions:
Biceps Mmax is similarly affected by 2 and 12 sets of strength training. The overall effect is minimal compared with ∼25% depression reported after similar training in a different arm posture. Thus, changes in Mmax appear more dependent on training posture than number of training sets. Muscle Nerve 54: 791-793, 2016.
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