Connahan Laura E, Ott Christopher A, Barry Vaughn W
Department of Health and Human Performance, Middle Tennessee State University, Murfreesboro, TN, USA.
Int J Exerc Sci. 2017 Mar 1;10(2):266-273. doi: 10.70252/HPNK7689. eCollection 2017.
The purpose of this study is to determine how caffeine affects exercise blood pressure (BP) and active and passive recovery BP after vigorous intensity exercise in physically active college-aged females. Fifteen physically active, ACSM stratified low-risk females (age (y): 23.53 ± 4.07, weight (kg): 60.34 ± 3.67, height (cm): 165.14 ± 7.20, BMI (kg/m): 22.18 ± 1.55) participated in two Bruce protocol exercise tests. Before each test participants consumed 1) a placebo or 2) 3.3 mg·kg of caffeine at least one hour before exercise in a counterbalanced double-blinded fashion. After reaching 85% of their age-predicted maximum heart rate, BP was taken and participants began an active (i.e. walking) recovery phase for 6 minutes followed by a passive (i.e. sitting) recovery phase. BP was assessed every two minutes in each phase. Recovery times were assessed until active and passive BP equaled 20 mmHg and 10 mmHg above resting, respectively. Participants completed each test 1-2 weeks a part. Maximal systolic and diastolic blood pressures were not significantly different between the two trials. Active recovery, passive recovery, and total recovery times were all significantly longer during the caffeine trial than the placebo trial. Furthermore, the time to reach age-predicted maximum heart rate was significantly shorter in the placebo trial than the caffeine trial. While caffeine consumption did not significantly affect maximal blood pressure, it did affect active and passive recovery time following vigorous intensity exercise in physically active females. Exercise endurance also improved after consuming caffeine in this population.
本研究的目的是确定咖啡因如何影响身体活跃的大学适龄女性在剧烈强度运动后的运动血压（BP）以及主动和被动恢复血压。15名身体活跃、美国运动医学学会（ACSM）分层为低风险的女性（年龄（岁）：23.53±4.07，体重（千克）：60.34±3.67，身高（厘米）：165.14±7.20，体重指数（千克/米）：22.18±1.55）参加了两次布鲁斯运动试验。在每次试验前，参与者以平衡双盲的方式在运动前至少一小时服用1）安慰剂或2）3.3毫克/千克咖啡因。在达到其年龄预测最大心率的85%后，测量血压，参与者开始6分钟的主动（即步行）恢复阶段，随后是被动（即坐着）恢复阶段。在每个阶段每隔两分钟评估一次血压。评估恢复时间，直到主动和被动血压分别比静息血压高20毫米汞柱和10毫米汞柱。参与者每隔1 - 2周完成一次每次试验。两次试验之间的最大收缩压和舒张压没有显著差异。在咖啡因试验期间，主动恢复、被动恢复和总恢复时间均显著长于安慰剂试验。此外，在安慰剂试验中达到年龄预测最大心率的时间显著短于咖啡因试验。虽然摄入咖啡因对最大血压没有显著影响，但它确实影响了身体活跃女性在剧烈强度运动后的主动和被动恢复时间。在该人群中摄入咖啡因后运动耐力也有所提高。
