Abstract
The CPR Guidelines recommended that the rescuer is replaced every minute. However, it is difficult in the first moments to carry out the relays with such cadence and, therefore, it may be necessary to prolong the CPR time of each rescuer. Physical fatigue has a significant effect on the quality of external chest compressions (ECC), which can decrease after as few as 1–5 min of CPR. Percentage or maximal heart rate (%RMHR) and effort perception (EP) were parameters usually analysed to evaluate the effort of the rescuer during CPR. The aims of this study were to analyse college students while they performed CPR on a manikin for three minutes, the following: (1) the optimal cut-off points of arms muscle strength to perform adequate ECC, (2) physiological response (%RMHR), and (3) the PE.
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