Summary
This study demonstrates that motor cortical inhibitory profiles vary across the day in a chronotype-dependent manner, with morning-type individuals showing a peak in cortical inhibition at 17:00 compared to 09:00. These findings have implications for timing light-based or neuromodulatory interventions, as individual chronotype may determine optimal windows for treatments targeting cortical excitability.
Key Findings
- Morning-type individuals showed significantly lower cortical inhibition in the morning with a progressive increase, peaking at 17:00 (ratio 17h/9h: 1.54; 95% CI: 1.06–2.22; p = 0.02) as measured by short-interval intracortical inhibition (SICI) at 2 and 5 ms intervals.
- No significant circadian variation in cortical excitability measures was observed for evening-type, intermediate-type, or the total sample across the 24-hour period.
- Morning and evening chronotype subgroups exhibited distinct long-interval intracortical inhibition profiles that were dependent on the interval used but independent of time of day.
Categories
Sleep & Circadian Health: Investigates circadian variation in motor cortical excitability over 24 hours, examining the interaction between the circadian timing system, sleep homeostatic pressure, and chronotype.
The Science of Light: Characterizes circadian profiles of cortical inhibition with implications for understanding chronobiological mechanisms relevant to lighting-based interventions.
Author(s)
PS Oliveira
Publication Year
2022
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The Science of Light
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