Variations in Static Force Control and Motor Unit Behavior with Error Amplification Feedback in the Elderly.

摘要: Error amplification feedback is a promising approach to advance visuomotor skill. As error detection and processing at short time scales decline with age, this study examined whether older adults could benefit from that included higher-frequency information guide force-tracking task. Fourteen young fourteen performed low-level static isometric visual guidance of typical containing augmented high-frequency errors. Stabilogram diffusion analysis was used characterize force fluctuation dynamics. Also, the discharge behaviors motor units pooled unit coherence were assessed following decomposition multi-channel surface electromyography. produced different behavioral neurophysiological impacts on adults. Older exhibited inferior task accuracy than feedback, but not Although stabilogram revealed led significant decrease in critical points for both groups, potentiated point fluctuations, short-term effective coefficients, exponent scaling only Moreover, adults, added size variability regularity cumulative rate, suppressed 13-35 Hz band. Virtual alters strategic balance between open-loop closed-loop controls force-tracking. Contrary expectations, prevailing use control contained enhanced undermined steadiness group, concerning declines physiological complexity neurobehavioral system common drive motoneuronal pool against destabilization.