Effects and after-effects of voluntary intermittent light finger touch on body sway |
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| Affiliation: | 1. Department of Sport and Health Sciences, Technical University Munich, Munich, Germany;2. Behavioural Brain Sciences Centre, School of Psychology, University of Birmingham, Birmingham, United Kingdom;3. School of Occupational Therapy, Chung Shan Medical University, Taichung, Taiwan;4. Physical Therapy Room, Chung Shan Medical University Hospital, Taichung, Taiwan;5. School of Physical Therapy, Chung Shan Medical University, Taichung, Taiwan;1. Centre for Mental Health Nursing Innovation, Institute for Health and Social Science Research, School of Nursing and Midwifery, Central Queensland University, Bruce Highway Rockhampton QLD 4702, Australia;2. Centre for Physical Activity Studies, Institute for Health and Social Science Research, School of Human, Health and Social Sciences, Central Queensland University, Bruce Highway, Rockhampton QLD 4702, Australia;1. Department of Surgery, Far Eastern Memorial Hospital, Taipei, Taiwan;2. Department of Radiology, Far Eastern Memorial Hospital, Taipei, Taiwan;3. Division of Gastroenterology, Far Eastern Memorial Hospital, Taipei, Taiwan;1. Department of Surgery, China Medical University, Taichung, Taiwan;2. Organ Transplantation Center, China Medical University, Taichung, Taiwan;3. Department of Anesthesiology, China Medical University, Taichung, Taiwan;4. China Medical University Hospital, China Medical University, Taichung, Taiwan;1. Department of Surgery, Far Eastern Memorial Hospital, Taipei, Taiwan;2. Department of Radiology, Far Eastern Memorial Hospital, Taipei, Taiwan;3. Division of Gastroenterology, Far Eastern Memorial Hospital, Taipei, Taiwan |
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| Abstract: | ![]()
Effects of light touch on body sway have usually been investigated with some form of constant contact. Only two studies investigated transient sway dynamics following the addition or withdrawal of light touch. This study adopted a paradigm of intermittent touch and assessed body sway during as well as following short periods of touch of varying durations to investigate whether effects and after-effects of touch differ as a function of touch duration. In a modified heel-to-toe posture, 15 blindfolded participants alternated their index finger position between no-touching and touching on a strain gauge in response to low- and high-pitched auditory cues. Five trials of 46 s duration were segmented into 11 sections: a 6-s no-touching period was followed by five pseudo-randomly ordered touching periods of 0.5-, 1-, 1.5-, 2-, and 5-s duration, each of which was followed by another 6-s no-touching interval. Consistent with previous research, compared to no-touching intervals sway was reduced during touch periods with touch durations greater than 2 s. Progressive reductions in sway were evident after touch onset. After touch withdrawal in the 2-s touch condition, postural sway increased and returned to baseline level nearly immediately. Interestingly, in the 5-s touch condition, reductions in sway persisted even after touch withdrawal in the medio-lateral and antero-posterior plane for around 2.5 s and 5.5 s, respectively. Our intermittent touch paradigm resulted in duration-dependent touch effects and after-effects; the latter is a novel finding and may result from a more persistent postural set involved in proactive sway control. |
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| Keywords: | Intermittent Light touch Postural sway Standing balance After-effects |
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