Aging, Neuromuscular Decline, and the Change in Physiological and Behavioral Complexity of Upper-Limb Movement Dynamics
Figure 3
Overall changes in mean RMS EMG activity from the extensor muscles of the forearm and examples of the power spectral profiles for a healthy young and elderly individual. Traces for each person are shown for conditions where only the finger was extended (the rest of the upper limb was externally supported) and when the entire upper arm was unsupported. As with Figure 2, any age-related differences in muscle activity were only seen under physically demanding task conditions.
