Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Aging-Related Changes in Hand Intrinsic and Extrinsic Muscles and Hand Dexterity : an MRI Investigation

  • Hsu, Jeffrey (Department of Kinesiology, University of Maryland, College Park) ;
  • Koh, Kyung (Department of Kinesiology, University of Maryland, College Park) ;
  • Park, Yang-Sun (Department of Kinesiology, University of Maryland, College Park) ;
  • Kwon, Hyun-Joon (Department of Kinesiology, University of Maryland, College Park) ;
  • Kim, Yoon-Hyuk (Department of Mechanical Engineering, College of Engineering, Kyunghee University, Global Campus) ;
  • Shin, Joon-Ho (Department of Stroke Rehabilitation, National Rehabilitation Center) ;
  • Shim, Jae-Kun (Department of Kinesiology, University of Maryland, College Park)
  • Received : 2015.10.30
  • Accepted : 2015.12.16
  • Published : 2015.12.31
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Abstract

Object : The purpose of this study was to investigate aging-related changes of intrinsic and extrinsic hand muscles in their strength, cross-sectional area and volume, force control, and multi-digit synergies. It was hypothesized that aging would negatively affect distal muscles (intrinsic muscles) more than proximal muscles (extrinsic muscles). Method : Nine young and eleven older right-handed participants underwent MRI scans of the hand and forearm. Muscle cross-sectional areas and volumes of the intrinsic and extrinsic hand muscles were determined. Result : Muscle volume of the intrinsic muscles were larger in the younger group than the older group while muscle volume of the extrinsic muscles did not differ. For the cross-sectional area, both the intrinsic and extrinsic muscles of the younger group were larger than the older group. The maximum strength of the intrinsic muscles of the young group was 31% greater than the older group ($399.1{\pm}26.4$ vs $270.2{\pm}22.9Ncm$, p < 0.05) while the extrinsic muscles showed no significant difference. Although the elderly group showed a trend of decreased force control and multi-digit synergies, no statistical differences were found. These findings indicate aging-related decreases in hand muscle size and strength affect intrinsic muscles more than extrinsic muscles, thus supporting the hypothesis that sarcopenia affects the muscle size and strength of distal muscles more than proximal muscles. Conclusion : The aging-related decreases in hand muscle size and function were more apparent in intrinsic hand muscles, located more distally, than extrinsic muscles, located more proximally.

Keywords

References

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