INTRODUCTION: Although the reductive effect of a single physical exercise (PE) session on postprandial lipemia (PPL) is controversial, studies indicate that caloric expenditure is the main determinant of PPL reduction. OBJECTIVE: Test the hypothesis that a PE session based on caloric expenditure modifies PPL. METHODS: This is a prospective controlled intervention study, including a cohort of 18 men with average age of 22 ± 1.3 years and BMI of 21 ± 4.2 kg/m². All were irregularly active students, with fasting triglyceride (TG) values of less than or equal to 150mg/dL. They were submitted to two PPL tests: Basal (PPLB) and Exercise (PPLE). Blood samples were collected at time 0 (fasting) and after ingestion of a lipid compound (25g) at 180 and 240 minutes for TG dosing. In the PPLE test, a PE session on treadmill was applied shortly after the collection at 120 minutes, achieving an energy expenditure of 500kcal. STATISTICS: The medians of the variation (delta) between the TG values between fasting and 120min (Δ1), fasting and 240min (Δ2) and between 120 and 240min (Δ3) were compared. The bi-directional Wilcoxon test was used to compare deltas. RESULTS: The TG medians of Δ1 respectively for PPLB and PPLE were 63 Vs.60 (p=0.95); Δ2 102 Vs. 25 (p=0.02) and Δ3 32 Vs. -10 (p<0.01). CONCLUSION: In this study, a physical exercise session based on caloric expenditure of 500kcal, after lipid intake, reduced the PPL peak in healthy youngsters.
Lipemia Pós-Prandial (LPP) é um processo fisiológico que reflete a capacidade do organismo metabolizar lipídeos. Poucos foram os estudos que avaliaram o efeito do exercício físico sobre a fase inicial da LPP e estes não descrevem a variação das lipoproteínas. Este estudo tem como objetivo verificar a variação na concentração das lipoproteínas de indivíduos durante a LPP no repouso e pós-exercício. Indivíduos entre 20 e 30 anos, irregularmente ativos e sem distúrbios metabólicos realizaram teste cardiopulmonar e dois testes de LPP: basal (TLPP-B) e exercício (TLPP-E). Amostras sanguíneas foram coletadas para dosagem das lipoproteínas no jejum, 30 minutos e após a ingestão de composto lipídico aos 90, 210 e 270 minutos. No TLPP-E, após a coleta de jejum, uma sessão de exercício a 80% do VO2 pico foi aplicada. Avaliados 32 indivíduos, 18 mulheres. Apenas lipoproteínas de muito baixa densidade apresentaram diferença significante (p = 0,001) nos TLPP. Não se verificou diferença significante na comparação das variações das lipoproteínas entre o TLPP-B e o TLPP-E (p = 0,985). Não ocorreu variação das lipoproteínas de alta e baixa densidade durante a fase inicial e platô da LPP. O exercício físico não influenciou na variação dessas lipoproteínas na fase inicial e platô da LPP.Palavras-chave: exercício, metabolismo, dislipidemia, lipídeos.
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