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. 1998 Nov 1;18(21):8965–8978. doi: 10.1523/JNEUROSCI.18-21-08965.1998

Fig. 4.

Fig. 4.

The magnitudes of rectified and averaged surface electromyograms (EMG level) from six muscles (shoulder monoarticular flexor and extensor muscles, biarticular flexor and extensor muscles, and elbow monoarticular flexor and extensor muscles) of subject A during posture maintenance tasks (a–f) in the middle center posture. The EMG levels were normalized in these tasks by the maximum EMG level for each individual muscle. The EMG levels of flexor muscles are depicted as black bars in the top portion of each graph, and the EMG levels of extensor muscles are depicted as gray bars in the bottom portion of each graph. Error bar on each bar graph represents SD of 24 trials of the corresponding EMG level.