Burr Jamie F, Beck Jenny L, Durocher John J
Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
Applied Human Sciences, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada.
J Sport Health Sci. 2019 Jul;8(4):370-375. doi: 10.1016/j.jshs.2017.01.009. Epub 2017 Jan 20.
Central arterial stiffness is a cardiovascular risk factor that can be readily affected through engagement in physical exercise training, with resistance and aerobic exercise having disparate affects. Despite the growing popularity of high-intensity cross-training (HICT), little is currently known about the effects of this mixed modality exercise stimulus on arterial stiffness. Therefore, the purpose of this study was to characterize the arterial stiffness of habitual HICT participants aerobically active and sedentary controls using a cross-sectional design.
A total of 30 participants were recruited: 10 middle-aged long-term participants of HICT (CrossFit) and 20 age, sex, and height matched controls (10 recreationally active, 10 sedentary). Central and peripheral pulse wave velocities were measured for the carotid-femoral and femoral-dorsalis pedis arterial segments. Aerobic fitness (maximal oxygen uptake, VO) was measured and typical exercise participation rates were self-reported for each group.
HICT participants manifested central pulse wave velocity (PWV) (5.3 ± 1.0 m/s, mean ± SD) and VO (43 ± 6 mL/kg/min) values nearly identical to active controls. Both active groups had significantly better values than sedentary controls (7.1 ± 1.0 m/s, ≤ 0.001; and 32 ± 7 mL/kg/min, = 0.01). No differences were observed in peripheral PWV between groups.
Habitual participation in HICT exercise was not associated with increased central nor peripheral arterial stiffness. Long-term HICT participants presented with similar fitness and arterial stiffness as compared with participants who practiced traditional aerobic exercise. Compared to sedentary living, HICT may offer musculoskeletal and cardiovascular health benefits without negatively impacting arterial stiffness.
中心动脉僵硬度是一种心血管危险因素，可通过参与体育锻炼训练而容易受到影响，抗阻运动和有氧运动具有不同的影响。尽管高强度交叉训练（HICT）越来越受欢迎，但目前对于这种混合模式运动刺激对动脉僵硬度的影响知之甚少。因此，本研究的目的是采用横断面设计，对习惯性进行HICT的参与者、有氧活动参与者和久坐不动的对照组的动脉僵硬度进行特征描述。
共招募了30名参与者：10名中年长期HICT（CrossFit）参与者以及20名年龄、性别和身高匹配的对照组（10名休闲活动者，10名久坐不动者）。测量了颈动脉-股动脉和股动脉-足背动脉节段的中心和外周脉搏波速度。测量了有氧适能（最大摄氧量，VO），并自我报告了每组的典型运动参与率。
HICT参与者的中心脉搏波速度（PWV）（5.3±1.0米/秒，平均值±标准差）和VO（43±6毫升/千克/分钟）值与活跃对照组几乎相同。两个活跃组的值均显著优于久坐对照组（7.1±1.0米/秒，P≤0.001；32±7毫升/千克/分钟，P=0.01）。各组之间在外周PWV方面未观察到差异。
习惯性参与HICT运动与中心或外周动脉僵硬度增加无关。与进行传统有氧运动的参与者相比，长期HICT参与者的适能和动脉僵硬度相似。与久坐不动的生活方式相比，HICT可能对肌肉骨骼和心血管健康有益，而不会对动脉僵硬度产生负面影响。
