Adaptation of the Feedforward Postural Response to Repeated Continuous Postural Perturbations

Ashleigh Kennedy, Nicoleta Bugnariu, Arnaud Guevel, Heidi Sveistrup

Laboratory “Motricité, Interactions, Performance” (EA 4334), University of Nantes, Nantes, France.
School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, Canada.
School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Canada..
University of North Texas Health Science Centre, Physical Therapy, Fort Worth, USA.

DOI: 10.4236/nm.2013.41007                

Abstract

We examined the adaptation of the postural response to repeated predictable platform oscillations. Our main goals were to determine whether the short-term changes that occurred during a minute long continuous postural perturbation trial were maintained in subsequent trials and to determine how many trials were required before participants fully adapted to the postural task. Ten participants performed ten minute-long postural trials on a platform that oscillated at 0.25 Hz before increasing to 0.50 Hz half way through each trial. Postural muscle onset latencies, burst amplitudes, and anterior posterior displacements of the center of pressure (COP) and center of mass (COM) were calculated for the last five cycles performed in each trial at 0.50 Hz. The postural strategy evolved in two phases: 1) immediate decrease in COP displacement; 2) earlier activation of the postural muscles with smaller muscle burst amplitudes. After seven trials the postural response remained consistent.

Keywords

Adaptation; Postural Control; Continual Perturbation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	L. M. Nashner, “Fixed Patterns of Rapid Postural Responses among Leg Muscles during Stance,” Experimental Brain Research, Vol. 30, No. 1, 1977, pp. 13-24. doi:10.1007/BF00237855
[2]	F. B. Horak and L. M. Nashner, “Central Programming of Postural Movements: Adaptation to Altered Support-Surface Configurations,” Journal of Neurophysiology, Vol. 55, No. 6, 1986, pp. 1369-1381.
[3]	A. S. Aruin, W. R. Forrest and M. L. Latash, “Anticipatory Postural Adjustments in Conditions of Postural Instability,” Electroencephalography and Clinical Neurophysiology/Electromyography and Motor Control, Vol. 109, No. 4, 1998, pp. 350-359. doi:10.1016/S0924-980X(98)00029-0
[4]	A. S. Aruin and M. L. Latash, “Directional Specificity of Postural Muscles in Feed-Forward Postural Reactions during Fast Voluntary Arm Movements,” Experimental Brain Research, Vol. 103, No. 2, 1995, pp. 323-332. doi:10.1007/BF00231718
[5]	M. Schmid, et al., “Adaptation to Continuous Perturbation of Balance: Progressive Reduction of Postural Muscle Activity with Invariant or Increasing Oscillations of the Center of Mass Depending on Perturbation Frequency and Vision Conditions,” Human Movement Science, Vol. 30, No. 2011, pp. 262-278.
[6]	J. Massion, “Movement, Posture and Equilibrium: Interaction and Coordination,” Progress in Neurobiology, Vol. 38, No. 1, 1992, pp. 35-56. doi:10.1016/0301-0082(92)90034-C
[7]	A. Shumway-Cook and M. Woollacott, “Motor Control: Translating Research into Clinical Practice,” 3rd Edition, Lippincott Williams & Wilkins, Washington DC, 2007,
[8]	P. D., Hansen, M. H. Woollacott and B. Debu, “Postural Responses to Changing Task Conditions,” Experimental Brain Research, Vol. 73, No. 3, 1988, pp. 627-636. doi:10.1007/BF00406622
[9]	K. Van Ooteghem, et al., “Aging Does Not Affect Generalized Postural Motor Learning in Response to Variable Amplitude Oscillations of the Support Surface,” Experimental Brain Research, Vol. 204, No. 4, 2010, pp. 505-514. doi:10.1007/s00221-010-2316-1
[10]	N. Bugnariu and H. Sveistrup, “Age-Related Changes in Postural Responses to Externallyand Self-Triggered Continuous Perturbations,” Archives of Gerontology and Geriatrics, Vol. 42, No. 1, 2006, pp. 73-89.
[11]	V. Dietz, et al., “Human Stance on a Sinusoidally Translating Platform: Balance Control by Feedforward and Feedback Mechanisms,” Experimental Brain Research, Vol. 93, No. 2, 1993, pp. 352-362. doi:10.1007/BF00228405
[12]	J. P. Scholz, et al., “Motor Equivalent Control of the Center of Mass in Response to Support Surface Perturbations,” Experimental Brain Research, Vol. 180, No. 3, 2007, pp. 163-179.
[13]	TCPS2, “Tri-council Policy Statement: Ethical Conduct for Research Involving Humans,” Canadian Institutes of Health Research, Natural Science and Engineering Research Council of Canada, and Social Sciences and Humanities Research Council of Canada, Tri-Council Policy Statement: Ethical Conduct for Research Involving Humans, 2010.
[14]	H. Hermens, et al., “Development of Recommendations for SEMG Sensors and Sensor Placement Procedures,” Journal of Electromyography and Kinesiology, Vol. 10, No. 5, 2000, pp. 361-375. doi:10.1016/S1050-6411(00)00027-4
[15]	J. P. Scholz and G. Sch?ner, “The Uncontrolled Manifold Concept: Identifying Control Variables for a Functional Task,” Experimental Brain Research, Vol. 126, No. 3, 1999, pp. 289-306. doi:10.1007/s002210050738
[16]	K. Fujiwara, et al., “Postural Control Adaptability to Floor Oscillation in the Elderly,” Journal of Physiological Anthropology, Vol. 26, No. 4, 2007, pp. 485-493. doi:10.2114/jpa2.26.485