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    ASIA unversity > 其他教學單位 > 體育室 > 期刊論文 >  Item 310904400/110780


    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/110780


    Title: Variations in static force control and motor unit behaviors with error amplification feedback in the elderly.
    Authors: 陳怡靜;Chen,Yi-Ching;林麗娟;Lin,Linda L.;林彥廷;Lin,Yen-Ting;胡家綾;Hu,Chia-Ling;黃英修;Hwang,Ing-Shiou
    Contributors: 體育室
    Date: 2017-11
    Issue Date: 2018-04-03 09:41:27 (UTC+8)
    Abstract: Error amplification (EA) feedback is a promising approach to advance visuomotor skill. As error detection and visuomotor processing at short time scales decline with age, this study examined whether older adults could benefit from EA feedback that included higher-frequency information to guide a force-tracking task. Fourteen young and 14 older adults performed low-level static isometric force-tracking with visual guidance of typical visual feedback and EA feedback containing augmented high-frequency errors. Stabilogram diffusion analysis was used to characterize force fluctuation dynamics. Also, the discharge behaviors of motor units and pooled motor unit coherence were assessed following the decomposition of multi-channel surface electromyography (EMG). EA produced different behavioral and neurophysiological impacts on young and older adults. Older adults exhibited inferior task accuracy with EA feedback than with typical visual feedback, but not young adults. Although stabilogram diffusion analysis revealed that EA led to a significant decrease in critical time points for both groups, EA potentiated the critical point of force fluctuations <ΔF2c>, short-term effective diffusion coefficients (Ds), and short-term exponent scaling only for the older adults. Moreover, in older adults, EA added to the size of discharge variability of motor units and discharge regularity of cumulative discharge rate, but suppressed the pooled motor unit coherence in the 13–35 Hz band. Virtual EA alters the strategic balance between open-loop and closed-loop controls for force-tracking. Contrary to expectations, the prevailing use of closed-loop control with EA that contained high-frequency error information enhanced the motor unit discharge variability and undermined the force steadiness in the older group, concerning declines in physiological complexity in the neurobehavioral system and the common drive to the motoneuronal pool against force destabilization.

    Keywords: motor control, force fluctuations, visuomotor processing, aging, electromyography
    Relation: Frontiers in Human Neuroscience
    Appears in Collections:[體育室] 期刊論文

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