Abstract
Obese sedentary individuals exhibit arterial dysfunction, as observed by increased pulse-wave velocity (PWV) and augmentation index ([email protected]), markers of arterial stiffness and pulse wave reflection, respectively. Since obesity and muscle strength are inversely related, muscle weakness in young obese women can be counteracted by high intensity resistance training. However, adverse effects on arterial function have been observed in young individuals following this exercise modality. Unloaded whole-body vibration training (U-WBVT) has improved PWV and [email protected] in overweight/obese pre- and post-menopausal women. However, U-WBVT appears to be low-intensity and the effects of moderate-intensity WBVT on arterial function and leg muscle strength are currently unknown. PURPOSE: To evaluate whether loaded whole-body vibration training (L-WBVT) would result in greater improvements in femoral-ankle PWV (faPWV, leg) and brachial-ankle PWV (baPWV, systemic), [email protected], and leg muscle strength when compared to U-WBVT and a non-exercising control (CON). METHODS: Twenty-two young overweight/obese women (age 20 ± 1 y; BMI 30.9 ± 0.7 kg/m2) were randomized into a CON, U-WBVT, or L-WBVT for 6 weeks. FaPWV, baPWV, [email protected], and leg muscle strength (1RM) were assessed at baseline and following 6 weeks. RESULTS: Significant reductions in faPWV (-0.41± 0.10 m/s; P < 0.01), baPWV (-0.55 ± 0.20 m/s; P < 0.05), and [email protected] (-4.9 ± 2.1 %; P < 0.05) were observed after L-WBVT; however, only the decreases in faPWV and [email protected] were significant (P < 0.01) compared with the CON group. Both U-WBVT and L-WBVT increased leg strength compared to CON (P < 0.01). CONCLUSIONS: L-WBVT significantly reduced leg arterial stiffness and wave reflection. The decrease in baPWV was mainly due to the reduction in faPWV. Although both WBVT protocols increased leg muscle strength similarly, L-WBVT may be a more efficient intervention than U-WBVT to improve arterial function in young obese women.
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