Nsenga Leunkeu, A., Shephard, R.J. and Ahmaidi, S. 2014. A brief history of exercise clearance and prescription: 1. The era of heart rate recovery curves. The Health & Fitness Journal of Canada. 7, 1 (Jan. 2014), 26–35. DOI:https://doi.org/10.14288/hfjc.v7i1.155.