Higgins, T. R., Lloyd, T., Manalansan, K., McDonald, S. and Thomas, B. (2018) “Comparisons in heart rate readings between the Bioconnected wireless exercise earpiece and a Polar T31-Coded Chest Strap during a GXT”, Journal of Human Sport and Exercise, 13(3), pp. 530–540. doi: 10.14198/jhse.2018.133.05.