Ruqaiyah Pengarang Abdullah, Nusratuddin Pengarang Hatta, Mochammad Pengarang Harun, Ayatullah Pengarang Amir, Fatmawati Pengarang Baharuddin, Alfina Pengarang

Abstract Background: During pregnancy, maternal cortisol increases 2-4 times. Every type of body response in the form of stress, both physical and psychological stress can increase ACTH secretion, which in turn can increase cortisol levels. Methods: This study uses quasi experimental / quasi experimental one group design pre and post test design with group control. The sample in this study was 24 respondents. . Cortisol level examination tool uses a microplate reader with the ELISA examination method. Results: There was a significant difference (p = 0.000 <∝) of the average cortisol level in the control group before observation (54.43 ± 25.86) and after observation (459.15 ± 28.08Whereas in the treatment group showed a significant difference (p = 0.004 <∝) the average cortisol level before being treated (65.26 ± 28.74) and after being treated (53.65 ± 23.68) Yoga exercises. Conclusion: There was a significant difference (p = 0,000 <∝), mean cortisol levels in the control group before observation (54.43 ± 25.86) and observations after (459.15 ± 28.08), whereas in the treatment group there were significant differences (p = 0.004 <∝ ) it can be concluded that prenatal yoga reduces cortisol levels before and after treatment. Keywords: Cortisol, blood level, ELISA, pregnant, Trimester III