Department of Kinesiology, Michigan State University, East Lansing, MI, USA.
J Hum Hypertens. 2024 Jul;38(7):568-574. doi: 10.1038/s41371-024-00921-6. Epub 2024 Jun 10.
Blood pressure (BP) assessment during exercise testing has the capacity to identify exaggerated exercise BP (EEBP). BP has a circadian rhythm; therefore, exercise BPs may change throughout the day complicating EEBP identification. The purpose of this study was to determine the effect of time of day on exercise BP in healthy young adults. Thirty-one participants [48% female; 23(4) years] completed a modified Bruce treadmill protocol in the morning (M), afternoon (A), and evening (E). Submaximal (stage 4) and peak (highest value) systolic BP (SBP) were determined and ΔSBP was calculated (peak SBP-pre-exercise SBP). Repeated-measures tests were used to compare SBP data. EEBP was defined as a submaximal SBP ≥ 170 mmHg. Chronotype was assessed using the Morning-Eveningness Questionnaire (MEQ) and Pearson correlations were used to determine the relationship between MEQ score and ΔSBP during all tests. Significance was set at P < 0.05. Submaximal SBP (M:159(25); A:156(16); E:162(24) mmHg; P = 0.295), peak SBP (M:177(32); A:184(25); E:185(26) mmHg; P = 0.087) and ΔSBP (M:62(29); A:67(23); 65(20) mmHg; P = 0.546) were similar across time points. Eight participants had an EEBP on at least two tests. MEQ scores were correlated with ΔSBP during the A test (r = 0.357, P = 0.049) and E test (r = 0.363, P = 0.045). In conclusion, time of day had no effect on SBP responses to exercise, but our correlational analysis suggests changes in SBP may differ between chronotypes depending on the time of day of exercise. Given the clinical value of EEBP, it is notable that 26% of our healthy young sample had EEBP.
血压（BP）在运动测试期间的评估有能力识别运动时的血压（EEBP）。BP 有一个昼夜节律；因此，运动 BP 可能会随着一天中的时间变化而变化，这使得 EEBP 的识别变得复杂。本研究的目的是确定时间对健康年轻成年人运动时血压的影响。31 名参与者[48%女性；23(4)岁]在早上（M）、下午（A）和晚上（E）进行改良布鲁斯跑步机方案。确定了亚最大（第 4 阶段）和最大（最高值）收缩压（SBP），并计算了 SBP 的变化（最大 SBP-运动前 SBP）。使用重复测量检验比较 SBP 数据。EEBP 定义为亚最大 SBP≥170mmHg。使用 Morning-Eveningness Questionnaire（MEQ）评估昼夜类型，并使用 Pearson 相关性来确定 MEQ 分数与所有测试期间的ΔSBP 之间的关系。P<0.05 为差异有统计学意义。亚最大 SBP（M：159(25)mmHg；A：156(16)mmHg；E：162(24)mmHg；P=0.295）、最大 SBP（M：177(32)mmHg；A：184(25)mmHg；E：185(26)mmHg；P=0.087）和ΔSBP（M：62(29)mmHg；A：67(23)mmHg；65(20)mmHg；P=0.546）在各时间点相似。有 8 名参与者在至少两项测试中出现 EEBP。MEQ 分数与 A 测试（r=0.357，P=0.049）和 E 测试（r=0.363，P=0.045）期间的ΔSBP 相关。总之，时间对运动时的 SBP 反应没有影响，但我们的相关性分析表明，根据运动时间，SBP 的变化可能在不同的昼夜类型之间有所不同。鉴于 EEBP 的临床价值，值得注意的是，我们健康年轻样本的 26%存在 EEBP。
