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Related Experiment Videos

Postural synergies associated with a stepping task.

V S Mercer1, S A Sahrmann

  • 1Division of Physical Therapy, University of North Carolina at Chapel Hill 27599-7135, USA. vmercer@css.unc.edu

Physical Therapy
|January 12, 2000
PubMed
Summary
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Children, young adults, and older adults show consistent early muscle activation but variable sequences when stepping. This suggests focusing on general balance rather than specific muscle patterns for rehabilitation.

Area of Science:

  • Biomechanics
  • Motor Control
  • Neuroscience

Background:

  • Synergistic muscle activation simplifies posture and movement control.
  • Understanding age-related differences in motor control is crucial.

Purpose of the Study:

  • To investigate consistent postural muscle activation sequences in children, young adults, and older adults during a stepping task.
  • To determine if age influences the variability of muscle synergy patterns.

Main Methods:

  • Surface electromyography (EMG) and a pressure switch were used to record muscle activation and movement onset/offset.
  • Twenty participants in each of three age groups (children, young adults, older adults) performed a stepping task.
  • Preferred postural synergies were identified based on the majority of trials for each subject.

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Main Results:

  • No significant differences in movement time were observed across age groups.
  • The tibialis anterior (TA) muscle was consistently activated first (93% of trials).
  • Significant variability in the order of subsequent muscle activation was found, with 14 different synergies observed across all participants.

Conclusions:

  • Early tibialis anterior activation may be due to biomechanical factors related to center of mass displacement.
  • The high variability in muscle synergy sequences across all age groups suggests that interventions should not target specific patterns for this task.
  • Therapeutic strategies for stepping tasks may benefit from a broader focus on balance rather than rigid synergy facilitation.