Purpose Increased arterial stiffness is observed with ageing and in individuals with low cardiorespiratory fitness ( V O ), 2peak and associated with cardiovascular risk. Following an exercise bout, transient arterial stiffness reductions offer short-term benefit, but may depend on exercise intensity. This study assessed the effects of exercise intensity on post-exercise arterial stiffness in older adults with varying fitness levels. Methods Fifty-one older adults (72 ± 5 years) were stratified into fitness tertiles ( V O : low-, 22.3 ± 3.1; mid-, 27.5 ± 2.4 2peak −1 −1 and high-fit 36.3 ± 6.5 mL kg min ). In a randomised order, participants underwent control (no-exercise), moderate-inten- sity continuous exercise (40% of peak power output; PPO), and higher-intensity interval exercise (70% of PPO) protocols. Pulse wave velocity (PWV), augmentation index (AIx75) and reflection magnitude (RM) were assessed at rest and during 90 min of recovery following each protocol. Results After control, delta PWV increased over time (P < 0.001) and delta RM was unchanged. After higher-intensity interval exercise, delta PWV (P < 0.001) and delta RM (P < 0.001) were lower to control in all t fi ness groups. After moderate- intensity continuous exercise, delta PWV was not different from control in low-fit
European Journal of Applied Physiology – Springer Journals
Published: May 30, 2018
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