Vijayalakshmi, I., K. C. Subha, and R. Niruba. “Comparison of Cardiac Vagal Activity Between Pre and Postmenopausal Women Using Heart Rate Recovery”. International Journal of Clinical Trials 1, no. 3 (November 1, 2014): 105–109. Accessed December 25, 2025. https://www.ijclinicaltrials.com/index.php/ijct/article/view/61.