Grasping the changes seen in older adults when reaching for objects of varied texture

PLoS One. 2013 Jul 31;8(7):e69040. doi: 10.1371/journal.pone.0069040. Print 2013.

Abstract

Old age is associated with reduced mobility of the hand. To investigate age related decline when reaching-to-lift an object we used sophisticated kinematic apparatus to record reaches carried out by healthy older and younger participants. Three objects of different widths were placed at three different distances, with objects having either a high or low friction surface (i.e. rough or slippery). Older participants showed quantitative differences to their younger counterparts - movements were slower and peak speed did not scale with object distance. There were also qualitative differences with older adults showing a greater propensity to stop the hand and adjust finger position before lifting objects. The older participants particularly struggled to lift wide slippery objects, apparently due to an inability to manipulate their grasp to provide the level of precision necessary to functionally enclose the object. These data shed light on the nature of age related changes in reaching-to-grasp movements and establish a powerful technique for exploring how different product designs will impact on prehensile behavior.

Publication types

  • Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Age Factors
  • Aged
  • Aged, 80 and over
  • Aging / physiology
  • Analysis of Variance
  • Biomechanical Phenomena
  • Female
  • Fingers / physiology*
  • Friction
  • Hand / physiology*
  • Hand Strength / physiology*
  • Humans
  • Lifting*
  • Male
  • Middle Aged
  • Movement / physiology
  • Psychomotor Performance / physiology*

Grants and funding

This study was funded by an Engineering and Physical Sciences Research Council Collaboration Fund obtained by BH, RW, PC, and MMW. ASL is funded through a White Rose Consortium PhD Studentship Network Grant. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.