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Effects of aging on motor cortex excitability
A Oliviero1, P Profice, P A Tonali
1FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Finca "la Peraleda" s/n, 45071 Toledo, Spain. aoliviero@tiscali.es
Neuroscience Research
|April 6, 2006
Summary
Aging is linked to reduced motor cortex excitability, indicated by smaller motor evoked potentials and shorter cortical silent periods in older adults. This suggests impaired intracortical circuit efficiency in old age.
Area of Science:
- Neuroscience
- Aging Research
- Motor Control
Background:
- Cerebral cortex excitability may change with age.
- Understanding age-related neural changes is crucial for maintaining motor function.
Purpose of the Study:
- To investigate age-associated alterations in cerebral cortex excitability.
- To compare motor cortex excitability between young and old individuals using transcranial magnetic stimulation.
Main Methods:
- Utilized transcranial magnetic stimulation (TMS) to assess motor cortex excitability.
- Measured motor evoked potential (MEP) amplitude and cortical silent period (CSP) duration.
- Compared TMS-derived measures between a group of young adults and a group of older adults.
Main Results:
- Older adults exhibited significantly smaller motor evoked potential amplitudes compared to younger adults (1.3+/-0.8 mV vs. 2.7+/-1.1 mV).
- Mean cortical silent period duration was significantly shorter in older adults than in younger adults (87+/-29 ms vs. 147+/-39 ms).
- The ratio of silent period duration to motor evoked potential amplitude remained consistent between the age groups.
Conclusions:
- The findings suggest that aging is associated with reduced motor cortex excitability.
- Impaired efficiency of intracortical circuits may underlie age-related changes in motor cortex function.
- This research contributes to understanding the neurophysiological basis of aging and motor control.