Characterization of the Stroke-Induced Changes in the Variability and Complexity of Handgrip Force
AbstractIntroduction: The variability and complexity of handgrip forces in various modulations were investigated to identify post-stroke changes in force modulation, and extend our understanding of stroke-induced deficits. Methods: Eleven post-stroke subjects and ten age-matched controls performed voluntary grip force control tasks (power-grip tasks) at three contraction levels, and stationary dynamometer holding tasks (stationary holding tasks). Variability and complexity were described with root mean square jerk (RMS-jerk) and fuzzy approximate entropy (fApEn), respectively. Force magnitude, Fugl-Meyer upper extremity assessment and Wolf motor function test were also evaluated. Results: Comparing the affected side with the controls, fApEn was significantly decreased and RMS-jerk increased across the three levels in power-grip tasks, and fApEn was significantly decreased in stationary holding tasks. There were significant strong correlations between RMS-jerk and clinical scales in power-grip tasks. Discussion: Abnormal neuromuscular control, altered mechanical properties, and atrophic motoneurons could be the main causes of the differences in complexity and variability in post-stroke subjects. View Full-Text
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Zhu, P.; Wu, Y.; Liang, J.; Ye, Y.; Liu, H.; Yan, T.; Song, R. Characterization of the Stroke-Induced Changes in the Variability and Complexity of Handgrip Force. Entropy 2018, 20, 377.
Zhu P, Wu Y, Liang J, Ye Y, Liu H, Yan T, Song R. Characterization of the Stroke-Induced Changes in the Variability and Complexity of Handgrip Force. Entropy. 2018; 20(5):377.Chicago/Turabian Style
Zhu, Pengzhi; Wu, Yuanyu; Liang, Jingtao; Ye, Yu; Liu, Huihua; Yan, Tiebin; Song, Rong. 2018. "Characterization of the Stroke-Induced Changes in the Variability and Complexity of Handgrip Force." Entropy 20, no. 5: 377.
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