Authors: Hattemer, Katja¹; Knake, Susanne¹; Reis, Janine¹; Rochon, Justine²; Oertel, Wolfgang H.¹; Rosenow, Felix¹; Hamer, Hajo M.¹

Source: Clinical Endocrinology, Volume 66, Number 3, March 2007 , pp. 387-393(7)

Publisher: Wiley-Blackwell

Abstract:

Summary Objective 

The pathophysiology of catamenial diseases such as epilepsy is unclear. Therefore, we investigated changes in cortical excitability during anovulatory and ovulatory cycles. Patients and methods 

Using transcranial magnetic stimulation (TMS), eight healthy women were investigated during anovulatory and 12 during ovulatory cycles. On days 8, −14, −7 and 2 of the cycle, resting motor threshold (RMT), cortical silent period (CSP), intracortical inhibition (ICI) and intracortical facilitation (ICF) were investigated. Repeated-measures analysis of variance (anova) and nonparametric methods were used for statistical analysis. Results 

A trend was seen for group by phase interaction regarding ICI (F = 2·5, P = 0·10). ICI varied during anovulatory cycles (median: 51·0% on day 8; 45·3% on day −14, 51·0% on day −7, and 28·6% on day 2; P = 0·040), mainly because of an increased inhibition on day 2. ICI was more pronounced in anovulatory cycles on day −14 (P = 0·021), −7 (P = 0·048) and 2 (P = 0·018) compared to ovulatory women who did not show intraindividual changes (P = 0·56). RMT, CSP and ICF showed no significant changes during anovulatory or ovulatory cycles. Conclusions 

The results suggest fluctuations in cortical excitability during anovulatory cycles, possibly due to the withdrawal of `excitatory' oestrogens that initiate menses in anovulatory cycles.

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-2265.2007.02744.x

Affiliations: 1: Department of Neurology and 2: Centre for Clinical Trials, University of Marburg, Germany

Publication date: 2007-03-01

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• In this Subject: Anatomy & Physiology ,  Internal Medicine
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