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Related Experiment Videos

Triaxial accelerometry to evaluate walking efficiency in older subjects.

Soh Iwashita1, Yoshiaki Takeno, Kazunobu Okazaki

  • 1Department of Sports Medical Sciences, Institute on Aging and Adaptation, Shinshu University Graduate School of Medicine, Matsumoto 390-8621, Japan.

Medicine and Science in Sports and Exercise
|October 3, 2003
PubMed
Summary

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Triaxial accelerometry accurately estimates walking efficiency in older adults. Strength training improved walking by enhancing anterior-posterior/mediolateral movement and reducing vertical energy loss.

Area of Science:

  • Biomechanics
  • Gerontology
  • Exercise Physiology

Background:

  • Assessing walking efficiency is crucial for understanding mobility in older adults.
  • Traditional methods for measuring oxygen consumption during walking can be cumbersome.
  • Triaxial accelerometry offers a potential non-invasive method for evaluating walking efficiency.

Purpose of the Study:

  • To validate triaxial accelerometry for estimating oxygen consumption during walking in older adults.
  • To investigate the impact of endurance and resistance training on walking efficiency and biomechanics in older adults.

Main Methods:

  • 13 male and 27 female older subjects (mean age 61 yrs) underwent graded walking tests to correlate oxygen consumption rate (.VO2) with total impulse (Itotal) from accelerometry.
  • 13 male and 40 female older subjects (mean age 62 yrs) participated in a 6- and 9-month training program (endurance/resistance).

Related Experiment Videos

  • Maximal isometric knee extension force (Fmax), maximal walking velocity (Vmax), and three-dimensional impulses (Ix, Iy, Iz) were measured before and after training.

    • Main Results:

    • .VO2 was highly correlated with Itotal (r = 0.958, P < 0.0001), confirming accelerometry's accuracy.
    • After 9 months of training, Fmax increased by 48% (P < 0.001) and Vmax by 21% (P < 0.001).
    • Training increased anterior-posterior (Ix/Itotal) and mediolateral (Iy/Itotal) impulses while decreasing vertical impulse (Iz/Itotal). Vmax correlated positively with Ix/Itotal and Iy/Itotal, and negatively with Iz/Itotal.

    Conclusions:

    • Triaxial accelerometry is a suitable method for assessing walking efficiency in older adults.
    • Strength training enhances walking efficiency by improving directional limb propulsion and reducing vertical instability.
    • Increased maximal isometric knee extension force is linked to improved walking performance and efficiency.