Conclusion
One-hundred and twenty-four experiments were carried out in order to determine the exact relationship between the intensity of exercise and the increase in heart rate. The results of the experiments show conclusively that the increase in heart rate is directly proportional to the intensity of the exercise and that the form of the curve representing this relationship is rectilinear.
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Tuttle, W. W., Research Qr. 2, 5. 1931.
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Tuttle, W.W. The response of the normal heart to exercises of graded intensity. Arbeitsphysiologie 4, 519–526 (1931). https://doi.org/10.1007/BF02010117
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DOI: https://doi.org/10.1007/BF02010117