Abstract
Recent research using measures to assess the time-dependent structure of postural fluctuations has provided new insights into the stability and adaptability of human postural control in adults. To date, little research has examined how postural dynamics reflecting the stability and adaptability of postural control may change as a function of development, especially during supra-postural tasks. The goal of this study was to examine the dynamics of postural fluctuations during a manual-fitting task in which precision, visual and postural task constraints were altered in children and adults. Three age groups were tested: 7-, 10-year olds and college aged adults. Recurrence quantification analysis (RQA) was used to assess the regularity (percent determinism) and complexity (entropy) of the center of pressure (CoP) in the anterior–posterior (AP) and medial-lateral (ML) directions. The CoP patterns exhibited by adults were more deterministic and more complex (higher entropy) than those of the 7-year-old children under the different experimental manipulations. No differences between the adults and the 10-year-old children were observed. The increase in determinism with a corresponding increase in entropy exhibited by the adults and older-children during a manual fitting task may be a prospective mechanism over which postural movements follow a more predictable path allowing for stable and flexible task performance. Our results also support the notion that complex postural fluctuations (as measured by RQA entropy) are functional and typically increase as the precision requirements of a manual task increase.
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Acknowledgments
This research was supported by National Institutes of Health Predoctoral Fellowship 5F31NS050930-02 to Jeffrey M. Haddad. The authors thank Dr. C. L. Webber, Jr. for helping clarify the computation of RQA variables. The authors also thank Dr. Laura J. Claxton for helping with data collection.
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Haddad, J.M., Van Emmerik, R.E.A., Wheat, J.S. et al. Developmental changes in the dynamical structure of postural sway during a precision fitting task. Exp Brain Res 190, 431–441 (2008). https://doi.org/10.1007/s00221-008-1483-9
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DOI: https://doi.org/10.1007/s00221-008-1483-9