The effect of actual and imaginary handgrip on postural stability during different balance conditions |
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| Affiliation: | 1. Department of Physical Therapy, Central Michigan University, Mt. Pleasant, MI, USA;2. Neuroscience Program, Central Michigan University, Mt. Pleasant, MI, USA;3. School of Engineering and Technology, Central Michigan University, Mt. Pleasant, MI, USA;1. Division of Pulmonary, Critical Care, & Sleep Medicine, Department of Medicine, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA;2. Department of Electrical Engineering and Computer Science, School of Engineering, Case Western Reserve University, Cleveland, OH 44106, USA;3. Department of Neurosciences, School of Medicine Case Western Reserve University, Cleveland, OH 44106, USA;4. Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Louis Stokes VA Medical Center, Cleveland, OH 44106, USA;2. Dialysis Unit, ECHO Nantes Dialysis Association, France;1. Shriners Hospitals for Children, Northern California, United States;2. Shriners Hospitals for Children, Springfield, United States;3. Shriners Hospitals for Children, Salt Lake City, United States;4. Shriners Hospitals for Children, Lexington, United States;1. Institute of Sport Science, University of Innsbruck, Innsbruck, Austria;2. Department of Neuroscience, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway;3. Human Performance Laboratory, University of Calgary, Calgary, AB, Canada;4. Department of Mechanical Engineering and Manufacturing, University of Calgary, Calgary, AB, Canada |
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| Abstract: | The stabilizing effect of holding an object on upright posture has been demonstrated in a variety of settings. The mechanism of this effect is unknown but could be attributed to either additional sensorimotor activity triggered by a hand contact or cognitive efforts related to performance of a supra-postural task. A potential mechanism was investigated by comparing postural stability in young healthy individuals while gripping a custom instrumented wooden stick with a 5N force and while imagining holding the same stick in the hand. Twenty subjects were tested during three standing balance conditions: on a stationary surface, on a freely moving rockerboard, and with an unexpected perturbation of 10° forward rockerboard tipping. Postural stability was evaluated as velocity of the center of mass (COM) and center of pressure (COP) compared across all experimental conditions. COM and COP velocities were equally reduced when subjects gripped the stick and imagined gripping while standing stationary and on the rockerboard. When perturbed, subjects failed to show any postural stability improvements regardless of handgrip task. Results indicate a stabilizing effect of focusing attention on motor task performance. This cognitive strategy does not appear to contribute any additional stabilization when subjects are perturbed. This study adds to the current understanding of postural stabilization strategies. |
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| Keywords: | Postural control Supra-postural task Haptic devices Dual task |
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