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I. The Validity of the 10 Beat Measure for Calculation of Heart Rate Minute

It has been proposed by Brooke, Hamley and Thomason (1970) "that exercise heart rate should be defined as the time taken for 10 beats of the heart measured from the stable wave pattern of the normal electrocardiogram and converted into beats/minute". They report that the 10 beat measure is the most acceptable for both within trial and between trial reliability during work to exhaustion on the Muller cycle ergometer when using a continuously increasing load.