Fu, Jiahao, and Zhenghu Liu. “The Change of HRV Before, During and After Tai Chi-XuLingDingJin”. The Journal of the International Society of Chinese Health Practices 2, no. 1 (October 25, 2021). Accessed April 26, 2024. http://ischp.org/journal/index.php/jischp/article/view/83.