Substantive hemodynamic and thermal strain upon completing lower-limb hot-water immersion; comparisons with treadmill running

K. N. Thomas, A. V. Van rij, S. Lucas, A. R. Gray, J. Cotter
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引用次数: 37

Abstract

ABSTRACT Exercise induces arterial flow patterns that promote functional and structural adaptations, improving functional capacity and reducing cardiovascular risk. While heat is produced by exercise, local and whole-body passive heating have recently been shown to generate favorable flow profiles and associated vascular adaptations in the upper limb. Flow responses to acute heating in the lower limbs have not yet been assessed, or directly compared to exercise, and other cardiovascular effects of lower-limb heating have not been fully characterized. Lower-limb heating by hot-water immersion (30 min at 42°C, to the waist) was compared to matched-duration treadmill running (65-75% age-predicted heart rate maximum) in 10 healthy, young adult volunteers. Superficial femoral artery shear rate assessed immediately upon completion was increased to a greater extent following immersion (mean ± SD: immersion +252 ± 137% vs. exercise +155 ± 69%, interaction: p = 0.032), while superficial femoral artery flow-mediated dilation was unchanged in either intervention. Immersion increased heart rate to a lower peak than during exercise (immersion +38 ± 3 beats·min-1 vs. exercise +87 ± 3 beats·min-1, interaction: p < 0.001), whereas only immersion reduced mean arterial pressure after exposure (−8 ± 3 mmHg, p = 0.012). Core temperature increased twice as much during immersion as exercise (+1.3 ± 0.4°C vs. +0.6 ± 0.4°C, p < 0.001). These data indicate that acute lower-limb hot-water immersion has potential to induce favorable shear stress patterns and cardiovascular responses within vessels prone to atherosclerosis. Whether repetition of lower-limb heating has long-term beneficial effects in such vasculature remains unexplored.
完成下肢热水浸泡后的实质性血流动力学和热应变;与跑步机的比较
运动诱导动脉血流模式,促进功能和结构适应,提高功能能力,降低心血管风险。虽然热量是通过运动产生的,但最近的研究表明,局部和全身被动加热可以在上肢产生有利的血流分布和相关的血管适应性。下肢急性加热的血流反应尚未被评估,或与运动直接比较,下肢加热对心血管的其他影响尚未完全表征。将10名健康的年轻成年志愿者的下肢热水浸泡加热(42°C 30分钟,腰部)与匹配持续时间的跑步机跑步(65-75%的年龄预测心率最大值)进行比较。完成后立即评估的股浅动脉剪切率在浸泡后增加到更大程度(平均±SD:浸泡+252±137% vs运动+155±69%,相互作用:p = 0.032),而股浅动脉血流介导的扩张在两种干预中都没有变化。浸泡将心率提高到比运动时更低的峰值(浸泡+38±3次·min-1 vs运动+87±3次·min-1,相互作用:p < 0.001),而只有浸泡降低了暴露后的平均动脉压(- 8±3 mmHg, p = 0.012)。浸泡时的核心温度升高是运动时的两倍(+1.3±0.4°C vs +0.6±0.4°C, p < 0.001)。这些数据表明,急性下肢热水浸泡有可能在容易发生动脉粥样硬化的血管中诱导有利的剪切应力模式和心血管反应。下肢反复加热是否对此类脉管系统有长期的有益影响尚不清楚。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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