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Transcallosal inhibition across the menstrual cycle : a TMS study.

Hausmann, M. and Tegenthoff, M. and Sänger, J. and Janssen, F. and Güntürkün, O. and Schwenkreis, P. (2006) 'Transcallosal inhibition across the menstrual cycle : a TMS study.', Clinical neurophysiology., 117 (1). pp. 26-32.

Abstract

Objective To determine if there are steroid-dependent changes in transcallosal transfer during the menstrual cycle in normal women. Methods We tested 13 normally cycling women during the menstrual, follicular and midluteal phases. Blood levels of estradiol (E) and progesterone (P) were determined by radioimmunoassay. Ipsilateral tonic voluntary muscle activity suppression, called ipsilateral silent period (iSP), was evoked by applying transcranial magnetic stimulation (TMS) over the left motor cortex and by measuring the EMG of the ipsilateral first dorsal interosseus (FDI) muscle. Both iSP-duration and transcallosal conduction times were measured and related to cycle phase and steroid levels. Results Duration of iSPs varied over the cycle with largest differences between follicular and midluteal phases. During the midluteal phase high levels of P were significantly related to short iSPs. This relation also applied to E levels and iSPs during the follicular phase. Conclusions Our study shows for the first time that the transcallosal transfer is modulated by E and P and changes over the menstrual cycle. Significance It is suggested that gonadal steroid hormones affect the interhemispheric interaction and change the functional cerebral organization sex dependently via its neuromodulatory properties on GABAergic and glutamatergic neurons.

Item Type:Article
Additional Information:
Keywords:TMS, Ipsilateral silent period, Corpus callosum, Interhemispheric interaction, Sex hormones, Estradiol, Progesterone.
Full text:Full text not available from this repository.
Publisher Web site:http://dx.doi.org/10.1016/j.clinph.2005.08.022
Record Created:05 Jun 2007
Last Modified:08 Apr 2009 16:33

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