- Biomedical Research (2010) Volume 21, Issue 2

Daytime hormonal rhythms in practitioners of the transcendental meditation-Sidhi program

The aim of the study was to evaluate the daytime rhythm of hormones in subjects who are practitioners of the advanced meditation technique TM-Sidhi. The study group consisted of five subjects, two women and three men, with at least two years of experience in the practice of the technique. Blood samples were taken at hourly intervals from 09:00h to 21:00h. The subjects practiced meditation for one hour between 12:00h and 13:00h. Cortisol and ACTH levels were measured using radioimmunoassay methods, whereas catecholamines concentrations were determined by high performance liquid chromatography. Cortisol showed a normal rhythm, with values significantly higher in the morning than in the afternoon (p=0.003, Kruskal-Wallis test), with a non significant decline in the levels during the period of meditation. For ACTH, there were no diurnal variations (p= 0.4), but with elevated levels of the hormone after meditation. Catecholamines showed no significant differences between the morning and afternoon concentrations (p= 0.09 for NE, p= 0.08 for E). After the TM-Sidhi program their values declined, reaching the minimum level at 14:00h. The present study found patterns of the daytime secretion of ACTH and catecholamines in practitioners of the TM-Sidhi technique that were different from those normally described. After the period of meditation, there was an increase in the levels of the hypophyseal hormone to reach its maximum daytime concentration. This was associated with decreased plasma catecholamines levels. The technique of meditation seems to have a significant effect on the sympathetic-adrenal medullary system and the neuroendocrine axis

Author(s): Jose R. Infantea; Fernando Peranb; Juan I. Rayoa; Justo Serranoa; Maria L. Domíngueza; Lucia Garciaa; Carmen Durana; Roman Sancheza; Ana Roldanc

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