Alves Naiane F B, Porpino Suênia K P, Monteiro Matheus M O, Gomes Enéas R M, Braga Valdir A
Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil.
Appl Physiol Nutr Metab. 2015 Apr;40(4):393-400. doi: 10.1139/apnm-2014-0351. Epub 2015 Feb 9.
The hypothesis that oral supplementation with virgin coconut oil (Cocos nucifera L.) and exercise training would improve impaired baroreflex sensitivity (BRS) and reduce oxidative stress in spontaneously hypertensive rats (SHR) was tested. Adult male SHR and Wistar Kyoto rats (WKY) were divided into 5 groups: WKY + saline (n = 8); SHR + saline (n = 8); SHR + coconut oil (2 mL·day(-1), n = 8); SHR + trained (n = 8); and SHR + trained + coconut oil (n = 8). Mean arterial pressure (MAP) was recorded and BRS was tested using phenylephrine (8 μg/kg, intravenous) and sodium nitroprusside (25 μg·kg(-1), intravenous). Oxidative stress was measured using dihydroethidium in heart and aorta. SHR + saline, SHR + coconut oil, and SHR + trained group showed higher MAP compared with WKY + saline (175 ± 6, 148 ± 6, 147 ± 7 vs. 113 ± 2 mm Hg; p < 0.05). SHR + coconut oil, SHR + trained group, and SHR + trained + coconut oil groups presented lower MAP compared with SHR + saline group (148 ± 6, 147 ± 7, 134 ± 8 vs. 175 ± 6 mm Hg; p < 0.05). Coconut oil combined with exercise training improved BRS in SHR compared with SHR + saline group (-2.47 ± 0.3 vs. -1.39 ± 0.09 beats·min(-1)·mm Hg(-1); p < 0.05). SHR + saline group showed higher superoxide levels when compared with WKY + saline (774 ± 31 vs. 634 ± 19 arbitrary units (AU), respectively; p < 0.05). SHR + trained + coconut oil group presented reduced oxidative stress compared with SHR + saline in heart (622 ± 16 vs. 774 ± 31 AU, p < 0.05). In aorta, coconut oil reduced oxidative stress in SHR compared with SHR + saline group (454 ± 33 vs. 689 ± 29 AU, p < 0.05). Oral supplementation with coconut oil combined with exercise training improved impaired BRS and reduced oxidative stress in SHR.
口服初榨椰子油(椰属)并进行运动训练可改善自发性高血压大鼠(SHR)受损的压力反射敏感性(BRS)并减轻氧化应激。成年雄性SHR和Wistar Kyoto大鼠(WKY)被分为5组:WKY + 生理盐水(n = 8);SHR + 生理盐水(n = 8);SHR + 椰子油(2 mL·天⁻¹,n = 8);SHR + 训练组(n = 8);以及SHR + 训练 + 椰子油组(n = 8)。记录平均动脉压(MAP),并使用去氧肾上腺素(8 μg/kg,静脉注射)和硝普钠(25 μg·kg⁻¹,静脉注射)测试BRS。使用二氢乙锭测量心脏和主动脉中的氧化应激。与WKY + 生理盐水组相比,SHR + 生理盐水组、SHR + 椰子油组和SHR + 训练组的MAP更高(分别为175 ± 6、148 ± 6、147 ± 7 vs. 113 ± 2 mmHg;p < 0.05)。与SHR + 生理盐水组相比,SHR + 椰子油组、SHR + 训练组和SHR + 训练 + 椰子油组的MAP更低(分别为148 ± 6、147 ± 7、134 ± 8 vs. 175 ± 6 mmHg;p < 0.05)。与SHR + 生理盐水组相比,椰子油联合运动训练改善了SHR的BRS(-2.47 ± 0.3 vs. -1.39 ± 0.09次·分钟⁻¹·mmHg⁻¹;p < 0.05)。与WKY + 生理盐水组相比,SHR + 生理盐水组的超氧化物水平更高(分别为774 ± 31 vs. 634 ± 19任意单位(AU);p < 0.05)。与SHR + 生理盐水组相比,SHR + 训练 + 椰子油组心脏中的氧化应激降低(622 ± 16 vs. 774 ± 31 AU,p < 0.05)。在主动脉中,与SHR + 生理盐水组相比,椰子油降低了SHR的氧化应激(454 ± 33 vs. 689 ± 29 AU,p < 0.05)。口服椰子油联合运动训练改善了SHR受损的BRS并减轻了氧化应激。