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Sinus tachycardia, 3D illustration showing sinus rhythm with shortened RR intervals and increased heart rate.
fitness, sport, exercise, lifestyle concept. close up of legs man and woman doing exercise on street sports ground. Team of two athletes exercising lunges while having sports training in the morning.
Woman doing side lunges on High-intensity interval training at home
PR and QT interval in ECG signaling 3d illustration

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