Muscular Strength is Inversely Associated with Aortic Stiffness in Young Men

FAHS, C. A., K. S. HEFFERNAN, S. RANADIVE, S. Y. JAE, and B. FERNHALL. Muscular Strength is Inversely Associated with Aortic Stiffness in Young Men. Med. Sci. Sports Exerc., Vol. 42, No. 9, pp. 1619-1624, 2010. Muscular strength is associated with reduced mortality. Paradoxically, strength training may increase central artery stiffness, a predictor of cardiovascular morbidity and mortality. However, the relationship between muscular strength and central arterial stiffness has yet to be defined. Purpose: The purpose of this study was to determine the relationship between muscular strength and central arterial stiffness in young men. Methods: Central and peripheral pulse wave velocity (PWV), augmentation index, muscular strength, and aerobic capacity ((V) over dotO(2peak)) were measured in 79 young men (mean +/- SD, age = 23 +/- 4 yr). Height, weight, and brachial blood pressure were also recorded. Muscular strength was determined using a one-repetition maximum bench press and normalized to bodyweight. Spearman correlations were used to determine the relationships between relative strength, aerobic fitness, and hemodynamic/vascular measures. Results: There was a significant negative correlation between central PWV and strength (r = -0.222, P < 0.05). The relationship remained significant when controlling for aerobic fitness (r = -0.189, P < 0.05). Muscular strength was significantly higher (P < 0.05) in men with low central PWV (5.2 +/- 0.4 m.s(-1)) compared with men with high central PWV (6.6 +/- 0.4 m.s(-1)). Conclusion: These results show that there is a significant inverse association between muscular strength and aortic stiffness independent of aerobic fitness.