Impact of an exercise program on acylcarnitines in obesity: a prospective controlled study

Rodríguez Gutiérrez, René y Lavalle González, Fernando Javier y Martínez Garza, Laura Elia y Landeros Olvera, Erick Alberto y López Alvarenga, Juan Carlos y Torres Sepúlveda, María del Rosario y González González, José Gerardo y Mancillas Adame, Leonardo G. y Salazar González, Bertha Cecilia y Villarreal Pérez, Jesús Zacarías (2012) Impact of an exercise program on acylcarnitines in obesity: a prospective controlled study. Journal of the International Society of Sports Nutrition, 9 (22). pp. 1-8. ISSN 1550-2783

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Resumen

Background: Acylcarnitine (AC) transport dysfunction into the mitochondrial matrix is one of the pathophysiological mechanisms of type 2 diabetes mellitus (DM). The effect of an aerobic exercise (AE) program on this condition in obese subjects without DM is unclear. Methods: A prospective, randomized, longitudinal, interventional study in a University Research Center involved a 10-week AE program in 32 women without DM and a body mass index (BMI) greater than 27 kg/m2. (Cases n = 17; Controls n = 15). The primary objective was to evaluate the influence of a controlled AE program on beta-oxidation according to modifications in short, medium, and long-chain ACs. Secondary objectives were to define the behavior of amino acids, and the correlation between these modifications with metabolic and anthropometric markers. Results: The proportion of dropouts was 17% and 6% in controls and cases, respectively. In cases there was a significant reduction in total carnitine (30.40 [95% CI 28.2 to 35.6]) vs. (29.4 [CI 95% 25.1 to 31.7]) p=0.0008 and longchain AC C14 (0.06 [95% CI 0.05 to 0.08]) vs. (0.05 [95% CI 0.05 to 0.09]) p=0.005 and in C18 (0.31 [95% CI 0.27 to 0.45]) vs. (0.28 [95% CI 0.22 to 0.32]) p=0.03. Free fatty acid levels remained without change during the study in both groups. Conclusion: In conclusion, a controlled 10-week AE program improved beta-oxidation by reducing long-chain ACs. This finding highlights the importance that AE might have in avoiding or reverting lipotoxicity, and in consequence, improving insulin sensitivity and pancreatic beta cell functional reserve.

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