Graduate Deptartment of Exercise Sciences, University of Toronto, Toronto, ON M5S 2W6, Canada.
Appl Physiol Nutr Metab. 2011 Dec;36(6):881-91. doi: 10.1139/h11-113. Epub 2011 Nov 9.
Equicaloric bouts of interval (IE: 5 × 2:2 min at 85% and 40% maximal oxygen uptake) and steady state (SS: 21 min at 60% maximal oxygen uptake) exercise were performed by 13 older prehypertensive males on separate days, at equivalent times of day, to assess the influence of exercise mode on postexercise hypotension (PEH). Exercise conditions were compared with a control session. Cardiovascular measures were collected for 30 min prior to, and 60 min following exercise. PEH, as measured by mean postexercise systolic blood pressure (SBP) decrease (IE: -4 ± 6 mm Hg; SS: -3 ± 4 mm Hg; control: 4 ± 4 mm Hg), area under the SBP curve (IE: -240 ± 353 mm Hg·min; SS: -192 ± 244 mm Hg·min), and minimum SBP achieved (IE: -15 ± 7 mm Hg; SS: -13 ± 7 mm Hg), was equivalent after both conditions. Stroke volume was significantly reduced (IE: -14.6 ± 16.0 mL; SS: -10.1 ± 14.2 mL, control -1.7 ± 2.2 mL) and heart rate was significantly elevated (IE: 13 ± 8 beats·min⁻¹; SS: 7.9 ± 8 beats·min⁻¹; control: -2 ± 3 beats·min⁻¹) postexercise after both conditions. Cardiac output and total peripheral resistance were nonsignificantly decreased and increased postexercise, respectively. Baroreflex sensitivity (BRS) was reduced following IE (p < 0.05) and heart rate variability (HRV) parameters were reduced after both conditions, with IE eliciting larger and longer reductions in some indices. The results from the current study indicate that older prehypertensive adults experience similar PEH following equicaloric bouts of IE and SS exercise despite larger alterations in HRV and BRS elicited by IE.
在不同的日子里，13 名老年前期高血压男性在每天相同的时间进行等热量的间歇（IE：85%和 40%最大摄氧量下的 5×2:2 分钟）和稳定状态（SS：60%最大摄氧量下的 21 分钟）运动，以评估运动方式对运动后低血压（PEH）的影响。将运动条件与对照期进行比较。在运动前和运动后 60 分钟收集心血管测量值。PEH 用平均运动后收缩压（SBP）下降（IE：-4±6mmHg；SS：-3±4mmHg；对照：4±4mmHg）、SBP 曲线下面积（IE：-240±353mmHg·min；SS：-192±244mmHg·min）和达到的最低 SBP（IE：-15±7mmHg；SS：-13±7mmHg）来衡量，两种条件下的结果是相当的。运动后，每搏量显著降低（IE：-14.6±16.0mL；SS：-10.1±14.2mL，对照-1.7±2.2mL），心率显著升高（IE：13±8 次·min⁻¹；SS：7.9±8 次·min⁻¹；对照：-2±3 次·min⁻¹）。两种条件下运动后，心输出量和总外周阻力分别显著降低和升高。运动后，压力反射敏感性（BRS）降低（IE 时 p<0.05），心率变异性（HRV）参数降低，IE 引起的某些指数的降低更大、持续时间更长。本研究结果表明，尽管 IE 引起的 HRV 和 BRS 变化较大，但等热量的 IE 和 SS 运动后，老年前期高血压成年人的 PEH 相似。
