长时间静坐前饮用木槿茶与咖啡对成人血压和心率变异性影响的急性效应：一项随机交叉试验。
完整摘要 · 中文译文
目的：比较在长时间不间断久坐前饮用木槿茶和咖啡对年轻健康成年人血压（BP）和心率变异性（HRV）的急性影响。 方法：在一项随机交叉试验中，参与者（n = 24；年龄24.9 [4.9]岁；50%为女性；54.2%超重/肥胖）在饮用木槿茶或咖啡后完成两次3小时长时间不间断久坐。连接Polar V800监测仪的Polar H10心率（HR）胸带评估HRV指标，包括HR、正常R-R间期标准差（SDNN）、相邻R-R间期差值均方根（RMSSD）、低频功率（LF）和高频功率（HF）。血压计（Welch Allyn Connex）测量收缩压（SBP）和舒张压（DBP），并计算平均动脉压（MAP）。由于数据偏态，HRV指标经自然对数转换（ln）。采用含随机效应的广义线性混合模型，在调整基线值后检验两种饮品对BP和HRV的影响。 结果：与咖啡条件相比，木槿茶条件下SBP、DBP和MAP显著更低（β分别为- 4.2、- 3.3、- 3.6 mmHg），lnHF显著更高（β = 0.3）（所有p < 0.05）。其他HRV指标未检出其他显著差异（所有p > 0.05）。按性别和BMI分层分析提示不同亚组间心血管反应可能存在差异，但由于未进行正式交互检验，这些发现应谨慎解读。 结论：这些发现提示 与咖啡相比，木槿茶可能具有潜力，能够有利地调节长时间不间断静坐时的心血管反应，但仍需进一步的对照研究来证实这些效应并确定其长期意义。
完整摘要 · 英文原文
PURPOSE: To compare acute effects of consuming hibiscus tea and coffee before prolonged uninterrupted sitting on blood pressure (BP) and heart rate variability (HRV) in young, healthy adults. METHODS: In a randomized crossover trial, participants (n = 24; 24.9 [4.9] years old; 50% women; 54.2% with overweight/obesity) completed two 3-hour prolonged uninterrupted sitting sessions after consuming hibiscus tea or coffee. A Polar H10 heart rate (HR) strap connected to a Polar V800 monitor evaluated HRV indices, including HR, standard deviation of normal R-R intervals (SDNN), root mean square of successive differences (RMSSD), low-frequency power (LF), and high-frequency power (HF). A sphygmomanometer (Welch Allyn Connex) measured systolic (SBP) and diastolic (DBP) BP, and mean arterial pressure (MAP) was calculated. HRV indices were natural log-transformed (ln) due to skewness. Generalized linear mixed models with random effects examined the influence of both beverages on BP and HRV while adjusting for baseline values. RESULTS: SBP, DBP, and MAP were significantly lower (β = - 4.2, - 3.3, - 3.6 mmHg, respectively), and lnHF (β = 0.3) was significantly higher in the hibiscus tea condition compared with the coffee condition (p < 0.05 for all). No other significant differences were detected for other HRV indices (p > 0.05 for all). Sex- and BMI-stratified analyses suggested potential variation in cardiovascular responses across subgroups, although these findings should be interpreted cautiously as formal interaction tests were not performed. CONCLUSIONS: These findings suggest that hibiscus tea may have potential to favorably modulate cardiovascular responses to prolonged uninterrupted sitting compared with coffee, although further controlled studies are needed to confirm these effects and establish their long-term implications.