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Neurology. 2002 Feb 26;58(4):630-5.

Neurophysiological correlates of age-related changes in human motor function.

Author information

1
Clinical Brain Disorders Branch, Intramural Research Program, National Institute of Mental Health, NIH, Bethesda, MD 20892-1379, USA. vsm@helix.nih.gov

Abstract

BACKGROUND:

There are well-defined and characteristic age-related deficits in motor abilities that may reflect structural and chemical changes in the aging brain.

OBJECTIVE:

To delineate age-related changes in the physiology of brain systems subserving simple motor behavior.

METHODS:

Ten strongly right-handed young (<35 years of age) and 12 strongly right-handed elderly (>50 years of age) subjects with no evidence of cognitive or motor deficits participated in the study. Whole-brain functional imaging was performed on a 1.5-T MRI scanner using a spiral pulse sequence while the subjects performed a visually paced "button-press" motor task with their dominant right hand alternating with a rest state.

RESULTS:

Although the groups did not differ in accuracy, there was an increase in reaction time in the elderly subjects (mean score plus minus SD, young subjects = 547 +/- 97 ms, elderly subjects = 794 +/- 280 ms, p < 0.03). There was a greater extent of activation in the contralateral sensorimotor cortex, lateral premotor area, supplementary motor area, and ipsilateral cerebellum in the elderly subjects relative to the young subjects (p < 0.001). Additional areas of activation, absent in the young subjects, were seen in the ipsilateral sensorimotor cortex, putamen (left > right), and contralateral cerebellum of the elderly subjects.

CONCLUSIONS:

The results of this study show that elderly subjects recruit additional cortical and subcortical areas even for the performance of a simple motor task. These changes may represent compensatory mechanisms invoked by the aging brain, such as reorganization and redistribution of functional networks to compensate for age-related structural and neurochemical changes.

PMID:
11865144
DOI:
10.1212/wnl.58.4.630
[Indexed for MEDLINE]

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