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Association between various cardiac time intervals and heart rate among the 48 bonnet macaques. All 4 intervals were obtained from all monkeys. QS1, electromechanical activation time; QS2, electromechanical systole; S1, first heart sound; S2, second heart sound; S1S2, interval between the first and second heart sounds; S2S1, interval between second and first heart sounds.
