Title page for ETD etd-05202004-150642


Type of Document Master's Thesis
Author Williams, Brian O
Author's Email Address brwillia@vt.edu
URN etd-05202004-150642
Title Effect of isokinetic resistance training on ulnar stiffness in young, college-aged women
Degree Master of Science
Department Human Nutrition, Foods, and Exercise
Advisory Committee
Advisor Name Title
Herbert, William G. Committee Chair
Nickols-Richardson, Sharon M. Committee Member
Ramp, Warren K. Committee Member
Wooten, David F. Committee Member
Keywords
  • Mechanical Response Tissue Analysis
  • Bone Mineral Content
  • Bending Stiffness
  • Bone Mineral Density
  • Ulna
Date of Defense 2004-05-06
Availability unrestricted
Abstract
Bone mineral content (BMC) and bone mineral density (BMD), measured

by dual x-ray absorptiometry are used clinically to diagnose osteoporosis

and estimate risk for fragility fractures. Bone mineral explains up to 70%

of bone strength; however, it does not take into account bone geometry.

Mechanical Response Tissue Analysis is a method of non-invasively

measuring the bending stiffness (EI) of bone which is determined by the

product of Young's modulus of elasticity (E) and the areal cross sectional

moment of inertia (I). The aim of the current study was to determine if

high intensity strength training will increase ulnar bending stiffness in

young women. Forty-nine women aged 19.9 ± 1.7 yrs, trained their nondominant

arm either concentrically or eccentrically in the Isokinetic

modality on the Biodex® system III 3d/wk for 32 wks. The dominant arm

served as the control limb (untrained). Analysis of all subjects regardless

of training mode demonstrated a significant increase in ulnar EI (22% ↑,

P=0.01) with no significant difference in the untrained arm. When EI

results were assessed by training mode, subjects who trained

eccentrically showed a significant increase for ulnar EI in the trained

limb (40% ↑, P=0.01) with no significant effect on the untrained limb

while concentric training demonstrated no significant gain in either the

trained or untrained arm. There was no effect of time x mode of training

interaction for either the trained or untrained limb. Bone mineral density

and bone mineral content of the ulna increased significantly in the

trained arm in both concentric and eccentric training modes (P<0.05).

These findings suggest support for the hypothesis that a critical

threshold of mechanical bending loads may be necessary to effect an

adaptation in bone strength and thus, eccentric training may be a novel

approach to increase ulnar EI in young women.

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