Effects of aging on hand function.
OBJECTIVE
The purpose of this study was to quantify age-induced changes in handgrip and finger-pinch strength, ability to maintain a steady submaximal finger pinch force and pinch posture, speed in relocating small objects with finger grip, and ability to discriminate two identical mechanical stimuli applied to the finger tip.


METHODS
A cross-sectional study.


METHODS
Greater Cleveland area of Ohio.


METHODS
Healthy, independent, young (n = 27, range 20-35 years) and older (n = 28, range 65-79 years) subjects.


METHODS
Handgrip strength, maximum pinch force (MPF), ability to maintain a steady pinch force at three relative force levels (5%, 10%, and 20% MPF) and three absolute force levels (2.5 Newtons (N), 4 N, and 8 N), ability to maintain a precision pinch posture, speed in relocating pegs from a nearby location onto the pegboard, and the shortest distance for discriminating two stimuli were measured in both young and older groups.


RESULTS
Compared with young subjects, the older group's handgrip force was 30% weaker (P < .001), MPF was 26% lower (P < .05), and ability to maintain steady submaximal pinch force and a precision pinch posture was significantly less (P < .05). The time taken to relocate the pegs and the distance needed to discriminate two identical stimuli increased significantly with age (P < .01). The decrease in the ability to maintain steady submaximal pinch force was more pronounced in women than men.


CONCLUSIONS
Aging has a degenerative effect on hand function, including declines in hand and finger strength and ability to control submaximal pinch force and maintain a steady precision pinch posture, manual speed, and hand sensation.
Ranganathan
V K
VK
Department of Rehabilitation Medicine, The Lerner Research Institute, The Cleveland Clinic Foundation, Ohio 44195, USA.
Siemionow
V
V
Sahgal
V
V
Yue
G H
GH
D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D005260:Female; D015577:Geriatric Assessment; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009048:Motor Skills / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology*; D012016:Reference Values; D012737:Sex Factors; D014110:Touch / Q000502:physiology*