This study compared the effects of self-selected exercise intensity (SEI) versus predetermined exercise intensity (PEI) on blood pressure (BP) and arterial stiffness in adolescents with obesity. A total of 37 adolescents, 14.7 (1.6) years old, body mass index ≥95th percentile were randomly allocated into SEI (n = 18; 12 boys) or PEI (n = 19; 13 boys). Both groups exercised for 35 minutes on a treadmill, 3 times per week, for 12 weeks. The SEI could set the speed at the beginning of the sessions and make changes every 5 minutes. The PEI adolescents were trained at an intensity set at 60% to 70% of heart rate reserve. Brachial and central BP, pulse pressure, augmentation index, and carotid–femoral pulse wave were determined at baseline and after 12 weeks. Both groups reduced brachial systolic BP (SEI, Δ = −9 mm Hg; PEI, Δ = −4 mm Hg; P < .01), central systolic BP (SEI, Δ = −4 mm Hg; PEI, Δ = −4 mm Hg; P = .01), and central pulse pressure (SEI, Δ = −4 mm Hg; PEI, Δ = −3 mm Hg; P = .02) without differences between groups. No changes in the augmentation index and carotid–femoral pulse wave were observed in either group. The SEI induced similar changes in various cardiovascular outcomes compared with PEI in adolescents with obesity.

本研究比较了自选运动强度 (SEI) 与预定运动强度 (PEI) 对肥胖青少年血压 (BP) 和动脉僵硬度的影响。共有 37 名 14.7 (1.6) 岁、体重指数≥95% 的青少年被随机分配到 SEI（n = 18；12 名男孩）或 PEI（n = 19；13 名男孩）。两组都在跑步机上锻炼 35 分钟，每周 3 次，持续 12 周。SEI 可以在会话开始时设置速度，并每 5 分钟更改一次。PEI 青少年的训练强度设置为心率储备的 60% 至 70%。在基线和 12 周后测定肱动脉和中心血压、脉压、增强指数和颈股动脉脉搏波。两组均降低了肱动脉收缩压（SEI，Δ = -9 mm Hg；PEI，Δ = -4 mm Hg；P  < .01）、中心收缩压（SEI，Δ = -4 mm Hg；PEI，Δ = -4 mm Hg；P  = .01）和中心脉压（SEI，Δ = -4 mm Hg；PEI， Δ = -3 mm Hg；P  = .02），组间无差异。两组均未观察到增强指数和颈股动脉脉搏波的变化。与肥胖青少年的 PEI 相比，SEI 在各种心血管结局方面引起了类似的变化。