Buchfuhrer, M.J., Hansen, J.E., Robinson, T.E., Sue, D.Y., Wasserman K. and Whipp, B.J. (1983) Optimizing the exercise protocol for cardiopulmonary assessment. Journal of Applied Physiology 55, 1558-1564.
Green, J.M., Crews, T.R., Pritchett, R.C., Mathfield C. and Hall, L. (2004) Heart rate and ratings of perceived exertion during treadmill and elliptical exercise training. Perceptual and Motor Skills 98, 340-348.
Haug, R.C., Porcari, J.P., Brice, G. and Terry, L. (1999) Development of a maximal testing protocol for the NordicTrack cross-country ski simulator. Medicine and Science in Sports and Exercise 31, 619-623.
Hofmann, P., Bunc, V., Leitner, H., Pokan, R. and Gaisl, G. (1994) Heart rate threshold related to lactate turn point and steady-state exercise on a cycle ergometer. European Journal of Applied Physiology 69, 132-139.
Hofmann P., Pokan R., Von Duvillard S.P., Seibert F.J., Zweiker R. and Schmid P. (1997b) Heart rate performance curve during incremental cycle ergometer exercise in healthy young male subjects. Medicine and Science in Sports and Exercise 29, 762-768.
Swain, D.P., Leutholtz, B.C., King, M.E., Haas, L.A. and Branch, J.D. (1998) Relationship between % heart rate reserve and %VO2reserve in treadmill exercise. Medicine and Science in Sports and Exercise 30, 318-321.
Vella, C.A. and Robergs, R.A. (2005) Non-linear relationships between central cardiovascular variables and VO2 during incremental cycling exercise in endurance-trained individuals. Journal of Sports Medicine and Physical Fitness 445, 452-459.
Weltman, A., Weltman, J., Rutt, R., Seip, R., Levine, S., Snead, D., Kaier, D. and Rogol A. (1989) Percentages of maximal heart rate, heart rate reserve, and VO2peak for determining endurance training intensity in sedentary women. International Journal of Sports Medicine 10, 212-216.