Title page for ETD etd-06172011-154041


Type of Document Master's Thesis
Author Costello, Kerry Elizabeth
Author's Email Address kec@vt.edu
URN etd-06172011-154041
Title Understanding the Independent Effects of Inertia and Weight on Balance
Degree Master of Science
Department Biomedical Engineering
Advisory Committee
Advisor Name Title
Madigan, Michael L. Committee Chair
Kraige, Luther Glenn Committee Member
Nussbaum, Maury A. Committee Member
Keywords
  • inertia
  • weight
  • dynamics
  • standing balance
  • obesity
Date of Defense 2011-06-03
Availability restricted
Abstract
While human balance is known to be affected by altered sensory feedback, altered dynamics may also contribute to balance deficiencies in certain populations. The goal of this study was, therefore, to investigate the effects of altered dynamics, namely increased inertia and increased weight, on standing balance. Sixteen normal-weight male participants completed quiet standing in a custom-built backboard under four conditions: baseline, increased inertia only, increased weight only, and increased inertia and weight. Increased inertia did not affect body center of mass movement (COM) or center of pressure (COP) movement, suggesting that no additional ankle torque was necessary to control the increased inertial forces. Increased weight caused increased body COM movement (increased backboard angle range and angular speed) and greater acceleration of the COM (as evidenced by increased COP-COM), requiring an increased level of corrections needed to maintain upright posture (as evidenced by increased COP speed) and increased ankle torques (as evidenced by increased range of COP position). Increasing inertia and weight simultaneously had the same effects as increasing weight except that there was no increased COM movement when both inertia and weight were increased. This indicates that there may be a slight mediating effect of increasing inertia on the extreme changes in balance observed when only weight is increased. These results indicate that altered dynamics of the body have an effect on human standing balance, just as altered sensory function has an effect on balance.
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