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. Department of Otolaryngology, Johns Hopkins University School of Medicine, Baltimore, MD, United States;2. Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, MD, United States;1. Biomechanics Research Building, University of Nebraska at Omaha, Omaha, NE 68182, USA;2. Department of Physical Therapy & Rehabilitation Science, University of Maryland, Baltimore, Baltimore, MD 21201, USA;2. Dialysis Unit, ECHO Nantes Dialysis Association, France;1. Department of Physical Therapy and Assistive Technology, National Yang Ming University, Taipei, Taiwan, ROC;2. Rehabilitation Center, Taipei Veterans General Hospital, Taiwan, ROC;3. Department of Physical Therapy, Chang Gung University, Taoyuan, Taiwan, ROC;4. Department of Biomedical Research, Mackay Memorial Hospital, Tamshui, Taipei County, Taiwan;1. Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, SE-901 87 Umeå, Sweden;2. Department of Women''s and Children''s Health, Karolinska Institutet, Karolinska University Hospital, Solna, Q2:07, SE-171 76 Stockholm, Sweden |
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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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