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Central somatosensory conduction time from 10 to 79 years
Electroencephalography and Clinical Neurophysiology
|July 1, 1982
Summary
Central somatosensory conduction time, measured via median nerve stimulation, remains stable until age 50. After 50, conduction time increases slightly, indicating age-related changes in nerve signal transmission.
Area of Science:
- Neuroscience
- Electrophysiology
- Human Aging Research
Background:
- Somatosensory evoked potentials (SEPs) are crucial for assessing the integrity of the somatosensory nervous system.
- Understanding age-related changes in central somatosensory conduction time is vital for interpreting neurophysiological data in older populations.
- Previous research has indicated potential alterations in nerve conduction with advancing age, but specific patterns in central conduction require further elucidation.
Purpose of the Study:
- To investigate age-dependent changes in central somatosensory conduction time (CSCT) in healthy individuals.
- To analyze the latency and amplitude variations of specific SEP components (N14 and N20) across different age groups.
- To establish normative data for CSCT and SEP amplitudes in a wide age range.
Main Methods:
- Recorded SEPs from the neck and scalp following median nerve stimulation at the wrist in 83 healthy subjects (aged 10-79 years).
- Calculated CSCT by subtracting the N14 peak latency (upper cervical response) from the N20 peak latency (cortical response).
- Analyzed age-related trends in CSCT, N14 amplitude, and N20 amplitude.
Main Results:
- CSCT remained constant from age 10 to 49 years.
- A significant, abrupt increase in CSCT of approximately 0.3 msec occurred between the fifth and sixth decades (50-59 years), with no further changes thereafter.
- Age-related changes in N14 and N20 amplitudes differed from latency changes and from each other; N14 amplitude declined after age 39, while N20 amplitude decreased initially and then increased until the seventh decade.
Conclusions:
- Central somatosensory conduction time shows a distinct age-related increase starting around the fifth decade.
- SEP component amplitudes exhibit complex age-dependent modifications separate from latency changes.
- These findings highlight significant age-related neurophysiological alterations in the somatosensory pathway.
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