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Bergstrom, H. C. (2014). Physiological responses at the critical heart rate during treadmill running. Ph.D. Dissertation, Department of Nutrition and Health Sciences, University of Nebraska-Lincoln.
Mielke, M., Housh, T. J., Hendrix, C. R., Zuniga, J., Camic, C. L., Schmidt, R. J., & Johnson, G. O. (2011). A test for determining critical heart rate using the critical power model. Journal of Strength and Condition Research, 25(2), 504¡V510.