Figure 1.
Examples of ISO, CON and ECC trials from one subject at 10% MVC.
TOP: Cursors 1 and 2 mark the beginning and end of analysis, respectively. In dynamic contractions Cursor 1 is 200 ms prior and Cursor 2 200 ms after the angle crosses the angle of the ISO trial, as indicated by the horizontal cursor. BOTTOM: 400 ms close-ups of the wire EMG signal of each trial.
Table 1.
Number of subjects and motor units (MU), motor unit discharge rate (MUDR) and relative force and sEMG levels of soleus (SOL) and gastrocnemius medialis (GM) in different conditions.
Figure 2.
Motor unit discharge rate (1/s; X±SD) at different relative force levels (%MVC) in eccentric (ECC), isometric (ISO) and concentric (CON) contractions.
Significant differences between conditions and force-levels: * = p<.05, ** = p<.01, *** = p<.001.
Table 2.
The difference in motor unit discharge rate (MUDR) between force levels in motor unit pairs (top) and all pooled units (bottom) in isometric contractions.
Figure 3.
Discharge rates of motor units that could clearly be recognized in at least two of the three contraction types at 10 (solid line), 20 (dashed line) and 40% of MVC (dotted line).
Figure 4.
Relative muscle activity in different trials. sEMG levels of soleus (A) and gastrocnemius medialis (B) at different force levels in eccentric (ECC), isometric (ISO) and concentric (CON) contractions.
sEMG is expressed relative to maximal isometric contraction (MVC). Significant differences between conditions and force-levels: * = p<.05, ** = p<.01, *** = p<.001.