caa a22 4500 467940495 CHVBK 20180406153011.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s00421-006-0262-1 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0262-1 The reorganization of tremulous movements in the upper limb due to finger tracking maneuvers [Elektronische Daten] [Ing-Shiou Hwang, Pei-Shan Wu] In light of the interplay between limb oscillatory outputs and the outcome performance of movement effectors, this study was undertaken to investigate neuromotor control in the upper limb during position tracking and posture holding. Sixteen volunteers conducted a postural pointing task and two index tracking maneuvers at 0.3 and 0.6Hz with an outstretched arm. Limb acceleration in the index finger, hand, forearm, arm, and C7 spinal process were monitored to correlate functionally with the accuracy of index rhythmic displacements. The results showed that index oscillatory activity multiplied with tracking speed, but hand oscillatory activity declined during tracking movement. The tracking maneuvers also altered spectral distribution of the tremulous activities in the context of a lower spectral peak in the range of 8-12Hz and suppression of spectral peaks at 2-4Hz, in reference to that already presented in posture tremor. Consisting of three local maxima around 2-4, 8-12, and 18-22Hz, the coherence of tremulous activity between the finger and hand during position tracking was nearly identical, but inferior to high coherence below 12Hz during posture holding. Functionally, better tracking performance was associated with a smaller tremulous activity in the finger and hand, entailing sophisticated release of mechanical couplings in the finger-hand and hand-forearm. In conclusion, inversely related to tracking performance, limb tremulous movements were task-dependently organized, and speed-invariant coherence of limb tremulous movement specified an inter-segmental coordination, which is physiological evidence of the generalized motor program for position tracking. Springer-Verlag, 2006 Action tremor nationallicence Posture tremor nationallicence Coherence nationallicence Position tracking nationallicence Hwang Ing-Shiou Department of Physical Therapy, College of Medicine, National Cheng Kung University, 701, Tainan, Taiwan aut Wu Pei-Shan Department of Physical Therapy, Shu-Zen College of Medicine and Management, 821, Lu Chu, Taiwan aut European Journal of Applied Physiology Springer-Verlag 98/2(2006-09-01), 191-201 1439-6319 98:2<191 2006 98 421 https://doi.org/10.1007/s00421-006-0262-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0262-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hwang Ing-Shiou Department of Physical Therapy, College of Medicine, National Cheng Kung University, 701, Tainan, Taiwan aut NATIONALLICENCE 700 1- Wu Pei-Shan Department of Physical Therapy, Shu-Zen College of Medicine and Management, 821, Lu Chu, Taiwan aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 98/2(2006-09-01), 191-201 1439-6319 98:2<191 2006 98 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer