The role of predictability of the magnitude of a perturbation in control of vertical posture when catching an object |
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| Affiliation: | 1. PhD Program in Rehabilitation Sciences, College of Applied Health Sciences, University of Illinois at Chicago, Chicago, IL, USA;2. School of Physical Therapy, Marshall University, Huntington, WV, USA;3. Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL, USA;1. Cognitive Neuroscience of Perception and Action, Faculty of Psychology, Philipps University Marburg, Marburg, Germany;2. Neuromotor Behavior Laboratory, Department of Psychology and Sport Science, Justus-Liebig-University Giessen, Giessen, Germany;3. Department of Psychology and Sports Sciences, Goethe-University Frankfurt/Main, Germany;1. CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Cruz Quebrada Dafundo, Portugal;2. CIMOSM, Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, 1959-007 Lisboa, Portugal;1. Graduate Program in Physical Therapy, Universidade Cidade de São Paulo, Rua Cesário Galeno, 448/475, Tatuapé, 03071-000 São Paulo, SP, Brazil;2. Physical Education Program, Federal University of São Paulo, Santos, SP, Brazil;3. Undergraduate Program in Physical Therapy, Universidade Paulista, Rua Dr. Bacelar, 1212, Vila Clementino, 04026-002 São Paulo, SP, Brazil;1. Department of Physical Therapy, Stony Brook University, Stony Brook, NY 11794-8201, United States of America;2. Department of Biobehavioral Sciences, Teachers College, Columbia University, New York, NY 10027, United States of America;3. Centre for Trials Research, Cardiff University, Cardiff, UK;4. Program in Physical Therapy and Department of Neurology, Wayne State University, Detroit, MI, United States of America;1. Luelå University of Technology, Health, Learning and Technology, Luleå, Sweden;2. University of Queensland, School of Health and Rehabilitation Sciences, Brisbane, Australia;3. University of Gävle, Occupational Health Sciences and Psychology, Gävle, Sweden |
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| Abstract: | The predictability of perturbation magnitude plays an important role in control of standing posture. The aim of the study was to examine anticipatory (APAs) and compensatory (CPAs) postural adjustments in response to catching objects of uncertain mass. Twenty adults caught the same object with either light or heavy weight placed in it. Electromyographic activity of eight trunk and leg muscles, displacements of the center of pressure, and angular displacement of the shoulder joint were recorded and analyzed during the APAs and CPAs intervals. When the subjects experienced repeated catching of the object with the same weight, they estimated the object mass beforehand and generated APAs more precisely. When the object mass changed unpredictably, they generated APAs based on the most recent catch and needed four to six trials to optimize APAs and CPAs. The muscle co-contraction was a primary pattern for catching the object of uncertain mass. The results of the study suggest that catching the object of uncertain mass is a challenging task that involves co-contraction of postural muscles to maintain balance. |
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