Dynamic aerobic exercise induces baroreflex improvement in diabetic rats.
The objective of the present study was to investigate the effects of an acute aerobic exercise on arterial pressure (AP), heart rate (HR), and baroreflex sensitivity (BRS) in STZ-induced diabetic rats. Male Wistar rats were divided into control (n = 8) and diabetic (n = 8) groups. AP, HR, and BRS, which were measured by tachycardic and bradycardic (BR) responses to AP changes, were evaluated at rest (R) and postexercise session (PE) on a treadmill. At rest, STZ diabetes induced AP and HR reductions, associated with BR impairment. Attenuation in resting diabetes-induced AP (R: 103 ± 2 versus PE: 111 ± 3 mmHg) and HR (R: 290 ± 7 versus PE: 328 ± 10 bpm) reductions and BR dysfunction (R: -0.70 ± 0.06 versus PE: -1.21 ± 0.09 bpm/mmHg) was observed in the postexercise period. In conclusion, the hemodynamic and arterial baro-mediated control of circulation improvement in the postexercise period reinforces the role of exercise in the management of cardiovascular risk in diabetes.
Heart Institute (InCor), University of Sao Paulo Medical School, 05001-100 Sao Paulo, SP, Brazil.
Luciana
L
Jorge
Demilto Y
DY
da Pureza
Danielle
D
da Silva Dias
Filipe Fernandes
FF
Conti
Maria-Cláudia
MC
Irigoyen
Kátia
K
De Angelis
D000818:Animals; D017704:Baroreflex / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology; D001919:Bradycardia / Q000503:physiopathology; D003921:Diabetes Mellitus, Experimental / Q000503:physiopathology*; D006339:Heart Rate / Q000502:physiology; D008297:Male; D010805:Physical Conditioning, Animal / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D013610:Tachycardia / Q000503:physiopathology