Chung, Y.-M., Lou, S.-L., Tsai, P.-Z., & Wang, M.-C. (2019). The Efficacy of Respiratory Regulation on Parasympathetic Nervous System Appraised by Heart Rate Variability. Journal of Medical and Biological Engineering, 39(6), 960–966. https://doi.org/10.1007/s40846-019-00472-z

Ertürk, Ç., & Özden, A. V. (2024). Comparison of the Acute Effects of Auricular Vagus Nerve Stimulation and Deep Breathing Exercise on the Autonomic Nervous System Activity and Biomechanical Properties of the Muscle in Healthy People. https://doi.org/10.20944/preprints202412.2163.v1

Fincham, G. W., Kartar, A., Uthaug, M. V., Anderson, B., Hall, L., Nagai, Y., Critchley, H., & Colasanti, A. (2023). High ventilation breathwork practices: An overview of their effects, mechanisms, and considerations for clinical applications. Neuroscience and Biobehavioral Reviews, 155, 105453. https://doi.org/10.1016/j.neubiorev.2023.105453

Kopplin, C. S., & Rosenthal, L. (2022). The positive effects of combined breathing techniques and cold exposure on perceived stress: a randomised trial. Current Psychology, 42. https://doi.org/10.1007/s12144-022-03739-y

Kox, M., van Eijk, L. T., Zwaag, J., van den Wildenberg, J., Sweep, F. C. G. J., van der Hoeven, J. G., & Pickkers, P. (2014). Voluntary activation of the sympathetic nervous system and attenuation of the innate immune response in humans. Proceedings of the National Academy of Sciences, 111(20), 7379–7384. https://doi.org/10.1073/pnas.1322174111

Singh, U. P. (2017). Evidence-Based Role of Hypercapnia and Exhalation Phase in Vagus Nerve Stimulation: Insights into Hypercapnic Yoga Breathing Exercises. Journal of Yoga & Physical Therapy, 07(03). https://doi.org/10.4172/2157-7595.1000276