C. Cheshier, B., H. Jacobson, B., A. Estrada, C., Moghaddam, M., & J. Stewart, C. . (2022). Effects of a Respiratory Resistance Mask on Forced Expiratory Volume at 1s (FEV1), Forced Vital Capacity (FVC) and the Ratio of FEV1/FVC Lung Function following High Intensity Training (HIT). International Journal of Physical Education, Fitness and Sports, 11(2), 28–34. https://doi.org/10.34256/ijpefs2224