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. Author manuscript; available in PMC: 2016 Oct 1.
Published in final edited form as: Exp Gerontol. 2015 Jul 6;70:1–10. doi: 10.1016/j.exger.2015.07.001

Figure 5. EMG activity for the elbow flexors muscles averaged for that during the dynamic fatiguing contraction task performed by young and old adults.

Figure 5

The RMS EMG (± SEM) activity is shown for biceps brachii (BB) and brachioradialis (BR) values normalized to EMG during the MVIC (% MVIC) and to the M wave (%Mmax). The brachioradialis EMG (BR % MVIC) was greater for old than young adults (age effect, *P<0.01) but similar for the age groups when normalized to the M wave. There was no age effect for the biceps brachii EMG when normalized to either the MVIC or Mmax.