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Related Experiment Videos

Age Group Differences in Postural Adjustments Associated With a Stepping Task.

V S Mercer1, S A Sahrmann2, V Diggles-Buckles3

  • 1a Movement Science Program.

Journal of Motor Behavior
|November 28, 2002
PubMed
Summary
This summary is machine-generated.

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Children show delayed postural adjustments and greater center of pressure (CP) path length, while older adults exhibit prolonged postural-focal latencies and reduced CP excursions during stepping tasks.

Area of Science:

  • Biomechanics
  • Motor Control
  • Developmental Neuroscience

Background:

  • Postural adjustments are crucial for maintaining stability during voluntary movements.
  • Age-related differences in motor control and coordination are well-documented but require further investigation in specific tasks like stepping.
  • Understanding these differences is vital for assessing functional mobility and fall risk across the lifespan.

Purpose of the Study:

  • To investigate age-related differences in postural adjustments during a stepping task.
  • To compare motor control strategies between children, young adults, and older adults.
  • To identify developmental and aging effects on the coordination of postural and focal movements.

Main Methods:

  • Participants included three age groups: children (8-12 years), young adults (25-35 years), and older adults (65-73 years).
Keywords:
center of pressurehuman stancepostural adjustmentreaction timestepping

Related Experiment Videos

  • Subjects performed a stepping task in two conditions: 'place' (lifting and placing foot on step) and 'step' (lifting, placing, and stepping up).
  • Surface electromyography, pressure switches, and a force platform were used to measure muscle activation latencies and center of pressure (CP) data.

    • Main Results:

    • All age groups exhibited anticipatory postural adjustments before movement initiation.
    • Children demonstrated longer postural latencies and disproportionately large CP path lengths compared to young adults.
    • Older adults showed prolonged postural-focal latencies and reduced CP excursions relative to younger groups.

    Conclusions:

    • Coordination between posture and movement may be immature in children aged 8-12 years.
    • Older adults (65-73 years) exhibit increased postural restraint during stepping tasks.
    • These findings highlight distinct age-related patterns in motor control strategies for postural stability.