Arterial elastic property in young endurance and resistance-trained women.
ABSTRACT In men, regular aerobic exercise increases central arterial elasticity, but it is decreased by resistance training. We determined the relation between the type of exercise training and arterial elasticity in healthy young women: 26 healthy young women who were sedentary (CO, n = 9), endurance-trained (ET, n = 9), and resistance-trained (RT, n = 8) groups. We determined the carotid arterial compliance and distensibility coefficient (simultaneous ultrasound and applanation tonometry), VO(2max), and 1RM (bench press and leg extension). The VO(2max) in the ET groups was higher than in the CO and RT groups. Both 1RM were higher in the RT groups than in the CO and ET groups. No significant difference was found in the carotid artery compliance and distensibility coefficient among the ET, RT, and CO groups. These results underscore the difficulty in detecting a change in arterial elasticity in young female athletes using the type of exercise training by which it is shown in young men.
- [Show abstract] [Hide abstract]
ABSTRACT: Endurance exercise training increases arterial baroreflex sensitivity that corresponds to alteration in vessel wall compliance of the carotid artery in elderly men. Here, we examined whether regular endurance exercise increases arterial baroreflex sensitivity through neural alteration of the baroreflex arc in young men. We assessed arterial baroreflex sensitivity in eight sedentary men (age 24 +/- 1 yr) and nine men trained in endurance exercise (age 23 +/- 1 yr) during phase IV of the Valsalva maneuver [systolic arterial blood pressure (SAP)-R-R interval relationship]. Arterial baroreflex sensitivity was further analyzed by dividing the mechanical component [SAP-end-systolic carotid lumen diameter relationship (ultrasonography)] and the neural component (end-systolic carotid lumen diameter-R-R interval relationship). Carotid arterial compliance was determined using B-mode ultrasound and arterial applanation tonometry on the common carotid artery. Arterial baroreflex sensitivity and its neural component were greater in the exercise-trained group (P < 0.05). In contrast, carotid arterial compliance and the mechanical component of arterial baroreflex sensitivity did not differ between groups. These results suggest that regular endurance exercise in young men increases arterial baroreflex sensitivity through changes in the neural component of the baroreflex arc and not through alterations in vessel wall compliance of the carotid artery.Journal of Applied Physiology 03/2009; 106(5):1499-505. · 3.48 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: 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. The purpose of this study was to determine the relationship between muscular strength and central arterial stiffness in young men. Central and peripheral pulse wave velocity (PWV), augmentation index, muscular strength, and aerobic capacity (V O2peak) 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. 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) compared with men with high central PWV (6.6 +/- 0.4 m.s). These results show that there is a significant inverse association between muscular strength and aortic stiffness independent of aerobic fitness.Medicine and science in sports and exercise 02/2010; 42(9):1619-24. · 4.48 Impact Factor