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Complement Ther Med. 2018 Dec;41:141-146. doi: 10.1016/j.ctim.2018.09.013. Epub 2018 Sep 22.

Exploring the effect of adaptogenic Rhodiola Rosea extract on neuroplasticity in humans.

Author information

1
Department of Medical Sciences, Neurology and Psychiatry, Hackensack Meridian School of Medicine at Seton Hall University, NJ, USA.
2
Psychiatry Unit, Department of Biomedical and Dental Sciences and Morphofunctional Imaging, University of Messina, Italy.
3
Pre-Clinical Sciences, New York College of Podiatric Medicine, New York, USA.
4
Department of Clinical and Experimental Medicine, Psychiatry Unit, University of Catania, Italy.
5
Department of Medical Sciences, Neurology and Psychiatry, Hackensack Meridian School of Medicine at Seton Hall University, NJ, USA. Electronic address: fortunato.battaglia@shu.edu.

Abstract

OBJECTIVES:

Rhodiola rosea extract is one of the most common herbal treatment for stress. Its mechanism of action in humans still need to be determined. We investigated the effect of a single dose intake of Rhodiola rosea extract on the plastic after-effects induced by anodal and cathodal motor cortex transcranial Direct Current Stimulation in humans.

METHODS:

Twenty-eight healthy volunteers were required to intake 500 mg of either RRE or placebo. Transcranial Magnetic Stimulation was used to investigate cortical excitability. Motor threshold, recruitment of motor-evoked potentials, cortical silent period, short-interval intracortical inhibition and intracortical facilitation were assessed at different time points. Spinal excitability and peripheral nerve conduction were measured by F-response and M-wave. Furthermore, we assessed the modulation of cortical plasticity using transcranial direct current stimulation after-effects on Motor Evoked Potentials amplitudes.

RESULTS:

Rhodiola rosea extract acute intake prevented cathodal transcranial Direct Current Stimulation-induced Long-term depression-like plasticity. The extract intake did not affect cortical excitability.

CONCLUSIONS:

Our findings suggest that a single oral dose of Rhodiola rosea extract intake modulates cortical plasticity in humans preventing the activity-dependent reduction in the efficacy of neuronal synapses. These results suggest that the adaptogenic and antidepressant effects of Rhodiola rosea extract might be based on its modulation of brain plasticity.

KEYWORDS:

Adaptogen; Cortical plasticity; Rhodiola rosea extract; Stress; Transcranial magnetic stimulation; tDCS

PMID:
30477830
DOI:
10.1016/j.ctim.2018.09.013
[Indexed for MEDLINE]

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