Story perspectives

Caffeine Gum Boosts TMS Inhibition, Researchers Advise Avoidance

5/9/2026

Summary

Caffeine Gum Inhibits

Caffeine gum increased afferent inhibition in constant-stimulus TMS when the sensory pulse preceded the magnetic pulse by 19–21 ms.
Twenty adults aged 20-42, abstaining 12 hours from caffeine, chewed 200 mg caffeine gum for ten minutes on one day and placebo on another and testing began 30 minutes later.
Caffeine lowered twitch intensity, raised inhibition at 19–21 ms, showed no effect with variable-stimulus method, and led researchers to advise avoiding caffeine before tests.

Summary

Caffeine Increases Excitability

Researchers report caffeine blocks adenosine receptors, raising acetylcholine and glutamate release and increasing neural excitability.
They propose the cholinergic surge may alter short-latency afferent inhibition, a rapid motor-control brake measured by TMS.
The authors link reduced inhibition to Alzheimer’s and Parkinson’s disease, where cholinergic networks deteriorate.
Planned studies will test the protocol in cognitively impaired patients to see if caffeine-induced changes improve diagnostic tracking of disease progression.

1 of 2

Caffeine Gum Inhibits

Caffeine gum increased afferent inhibition in constant-stimulus TMS when the sensory pulse preceded the magnetic pulse by 19–21 ms.
Twenty adults aged 20-42, abstaining 12 hours from caffeine, chewed 200 mg caffeine gum for ten minutes on one day and placebo on another and testing began 30 minutes later.
Caffeine lowered twitch intensity, raised inhibition at 19–21 ms, showed no effect with variable-stimulus method, and led researchers to advise avoiding caffeine before tests.

1 / 2