Reciprocal influences on performances of a postural–suprapostural task by manipulating the level of task-load |
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| Authors: | Cheng-Ya Huang Rong-Ju Cherng Ing-Shiou Hwang |
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| Institution: | 1. Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan;2. Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan;1. School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan;2. Physical Therapy Center, National Taiwan University Hospital, Taipei, Taiwan;3. School of Post-Baccalaureate Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan;4. Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan;5. Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan;1. Department of Physiology, Pharmacology & Neuroscience, CUNY Medical School, New York, NY 10031, USA;2. Department of Neurology, Movement Disorders Center, NYU-Langone School of Medicine, New York, NY 10016, USA;3. Department of Neurosciences, Ophthalmology and Genetics, University of Genova, 16132, Italy;4. Department of Neurosciences, Psychiatry and Anaesthesiological Sciences, University of Messina, Messina, 98125, Italy;5. Department of Psychiatry, University of Madison, WI 53719, USA |
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| Abstract: | The objective of this study was to investigate the reciprocal influences of stance pattern (bilateral stance vs. unilateral stance) and thumb-index precision grip task (static target vs. dynamic target) on postural–suprapostural tasks by manipulating task-load. Fifteen healthy volunteers participated in four postural–suprapostural tasks, including static force-matching in bilateral/unilateral stance (BS_static; US_static), dynamic force-matching in bilateral/unilateral stance (BS_dynamic; US_dynamic), and two control tasks in bilateral and unilateral stances without a finger task. The normalized force error (NFE), reaction time (RT) of the finger tasks, and normalized change in center of pressure sway (ΔNCoP) were measured. For suprapostural task performance, a significant interaction effect between postural and suprapostural tasks on NFE of the finger tasks was noted (static: BS < US; dynamic: BS > US), but RT was not different among the four tasks. For postural task performance, negative ΔNCoP during unilateral stance indicated a spontaneous reduction in postural sway due to added force-matching. In contrast, addition of force-matching tended to increase postural sway during bilateral stance, but postural fluctuations decreased as task-load of suprapostural task increased (BS_dynamic < BS_static). In conclusion, performance of postural–suprapostural tasks was differently modulated by task-load increment. Our observations favored adaptive resource-sharing and implicit expansion of resource capacity for a postural task with a motor suprapostural goal. |
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