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Previous issue date: 2017-11-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Sabe-se que a suplementa??o de nitrato pode reduzir a press?o arterial em v?rias popula??es. No entanto, o efeito do suco de beterraba na resposta press?rica p?s-exerc?cio n?o tem sido ainda estudado. O objetivo deste estudo foi verificar o efeito da suplementa??o de nitrato diet?tico, na forma de suco de beterraba, sobre a resposta press?rica p?s-exerc?cio em indiv?duos com obesidade. Em um ensaio cl?nico randomizado do tipo cruzado, 14 homens, normotensos e com obesidade, foram aleatoriamente submetidos a tr?s sess?es experimentais: 1) suco de beterraba com exerc?cio (SBE; 200ml com ? 800mg nitrato), 2) refresco de frutas industrializado com exerc?cio (RFE; 200ml de bebida com baixo teor de nitrato), considerado o controle com exerc?cio e 3) controle sem exerc?cio (CON; 200ml de bebida com teor insignificante de nitrato). O exerc?cio realizado foi do tipo aer?bio moderado, com intensidade de 50% da frequ?ncia card?aca de reserva, e com dura??o de 40 minutos. A concentra??o de nitritos e nitratos plasm?ticos totais (NOx) foi avaliada em quatro momentos: jejum (primeiro dia), 60 minutos (60min), 105 minutos (105min) e 165 minutos (165min) ap?s a ingest?o das bebidas (sess?o experimental). A press?o arterial (PA) ambulatorial de 24 horas (24h) foi avaliada por meio da monitoriza??o ambulatorial da press?o arterial (MAPA). Para an?lise estat?stica dos dados, foi utilizado a ANOVA de medidas repetidas e ANOVA two-way com medidas repetidas (condi??o vs. tempo) para compara??es de vari?veis entre as sess?es experimentais. Os resultados mostram que a concentra??o de NOx plasm?tico aumentou significativamente apenas na condi??o SBE em todos os momentos a partir de 60min, ap?s a ingesta do suco de beterraba, em compara??o com RFE e CON. A PA sist?lica (PAS) ambulatorial reduziu ~ 5,3 mmHg (p < 0,05) durante as primeiras seis horas p?s-exerc?cio, resultando na redu??o da PAS em ~3 mmHg (p < 0,05), e da PA diast?lica (PAD) em ~ 2 mmHg (p < 0,05) no per?odo de 24h ap?s a sess?o SBE comparado ?s sess?es RFE e CON. Em conclus?o, o suco de beterraba potencializou a resposta na PA p?s-exerc?cio ambulatorial em homens com obesidade e normotensos. / It has been shown that nitrate supplementation may reduce blood pressure in several populations. However, the effect of beetroot juice on post-exercise blood pressure response has not yet been studied. The objective of this study was to verify the effect of dietary nitrate supplementation, in the form of beetroot juice, on post-exercise blood pressure response in obese individuals. In a randomized, cross-over trial, 14 normotensive and obese men were randomly assigned to three experimental sessions: 1) beetroot juice with exercise (BJE, 200ml with ? 800mg nitrate), 2) fruit soda industrialized with exercise (FSE, 200ml of low-nitrate beverage), considered control with exercise and 3) control without exercise (CON, 200ml of drink with insignificant nitrate content). The exercise performed was of the moderate aerobic type, with intensity of 50% of the reserve heart rate and, lasting 40 minutes. The concentration of nitrites and total plasma nitrates (NOx) was evaluated at four moments: fasting (first day), 60 minutes (60min), 105 minutes (105min) and 165 minutes (165min) after drinking (experimental session). And 24-hour ambulatory blood pressure (24h) was also evaluated through ambulatory blood pressure monitoring (ABPM). For statistical analysis of the data, we used repeated measurements ANOVA and two-way ANOVA with repeated measurements (condition vs. time) for comparisons of variables between the experimental sessions. The results show that the plasma NOx concentration increased significantly only in the BJE condition at all times from 60min after the intake of beetroot juice, compared to FSE and CON. Ambulatory systolic blood pressure (SBP) decreased ~ 5.3 mmHg (p <0.05) during the first six hours post-exercise, resulting in a reduction of SBP by ~ 3 mmHg (p <0.05), and diastolic blood pressure (DBP) at ~ 2 mmHg (p <0.05) in the 24-hour period after the BJE session compared to FSE and CON sessions. In conclusion, beetroot juice potentiated ambulatory post-exercise BP responses in obese and normotensive men.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24762 |
| Date | 29 November 2017 |
| Creators | Bezerra, ?gnes Denise de Lima |
| Contributors | 95978887004, Silva, Alexandre S?rgio, 60230800491, Morais, Ana Heloneida de Ara?jo, 02587306418, Costa, Eduardo Caldas, Fayh, Ana Paula Trussardi |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM NUTRI??O, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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