Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Part I Methodology
- Part II The physiology of grasping
- 10 The study of hand movements during grasping. A historical perspective
- 11 Sensory control of object manipulation
- 12 Predictive mechanisms and object representations used in object manipulation
- 13 The neurohaptic control of the hand
- 14 Points for precision grip
- 15 Two hands in object-oriented action
- 16 Dynamic grasp control during gait
- 17 Development of grasping and object manipulation
- 18 The effects of aging on sensorimotor control of the hand
- Part III The pathophysiology of grasping
- Part IV Therapy of impaired grasping
- Index
- Plate section
- References
18 - The effects of aging on sensorimotor control of the hand
Published online by Cambridge University Press: 23 December 2009
- Frontmatter
- Contents
- List of contributors
- Preface
- Part I Methodology
- Part II The physiology of grasping
- 10 The study of hand movements during grasping. A historical perspective
- 11 Sensory control of object manipulation
- 12 Predictive mechanisms and object representations used in object manipulation
- 13 The neurohaptic control of the hand
- 14 Points for precision grip
- 15 Two hands in object-oriented action
- 16 Dynamic grasp control during gait
- 17 Development of grasping and object manipulation
- 18 The effects of aging on sensorimotor control of the hand
- Part III The pathophysiology of grasping
- Part IV Therapy of impaired grasping
- Index
- Plate section
- References
Summary
Summary
Aging-related decline in hand function is ubiquitous and inexorable, beginning at about age 60 years. This decline disproportionately impacts dexterous grasp and manipulation. Many potential explanations for this decline have been offered, but the causes remain poorly understood. Here we report observations from our laboratory on timed tasks demonstrating that the forces and kinematics of dexterous grasp and manipulation in old adults differ from young adults, even at “comfortable” performance speeds. These observations support recent suggestions that controlling the moments of force applied to grasped objects is a fundamental problem in old age. Possible explanations lead to a review of contemporary issues related to the sensorimotor control of the aging hand. These topics include: sensory deterioration (both peripheral and central); reduced ability to coordinate muscle forces to control force vectors at the fingertip of a single digit and across digits; increased moment-to-moment force fluctuations; and loss of independent control of the right and left hands. On an optimistic note, training and practice appears to slow or reverse declining hand function in healthy aging.
Introduction
Hand function deteriorates unequivocally in healthy aging. Well-known decreases in muscle strength, mostly from sarcopenia (Holloszy, 1995; Hughes et al., 2001; Doherty, 2003), can account for increased difficulty in accomplishing some daily living skills, such as opening containers (Sperling, 1960; Shiffman, 1992). Manual dexterity also declines in old age, but in a manner that is dissociated from decreasing muscle strength.
- Type
- Chapter
- Information
- Sensorimotor Control of GraspingPhysiology and Pathophysiology, pp. 250 - 266Publisher: Cambridge University PressPrint publication year: 2009
References
- 1
- Cited by