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State-of-the-Art Lecture

1999; Lippincott Williams & Wilkins; Volume: 34; Issue: 4 Linguagem: Inglês

10.1161/01.hyp.34.4.720

1524-4563

Eduardo Moacyr Krieger, Patrı́cia C. Brum, Carlos Eduardo Negrão,

Heart Rate Variability and Autonomic Control

Exercise training plays an important role in the reduction of high blood pressure. In this review, we discuss the effect of distinct intensities of exercise training on the reduction of high blood pressure in spontaneously hypertensive rats (SHR). In addition, we present some hemodynamic mechanisms and associated neural controls by which exercise training attenuates hypertension in SHR. Low-intensity exercise training is more effective in reducing high blood pressure than is high-intensity exercise training in SHR. The decrease in blood pressure is due to resting bradycardia, and in consequence, lower cardiac output. Sympathetic attenuation to the heart is the major explanation for the resting bradycardia. Recovery of the sensitivity of baroreflex control of heart rate, which is usually impaired in SHR, is an important neurogenic component involved in the benefits elicited by exercise training.