Post-Exercise Hypotension and Its Mechanisms Differ after Morning and Evening Exercise: A Randomized Crossover Study
نویسندگان
چکیده
Post-exercise hypotension (PEH), calculated by the difference between post and pre-exercise values, it is greater after exercise performed in the evening than the morning. However, the hypotensive effect of morning exercise may be masked by the morning circadian increase in blood pressure. This study investigated PEH and its hemodynamic and autonomic mechanisms after sessions of aerobic exercise performed in the morning and evening, controlling for responses observed after control sessions performed at the same times of day. Sixteen pre-hypertensive men underwent four sessions (random order): two conducted in the morning (7:30 am) and two in the evening (5 pm). At each time of day, subjects underwent an exercise (cycling, 45 min, 50%VO2peak) and a control (sitting rest) session. Measurements were taken pre- and post-interventions in all the sessions. The net effects of exercise were calculated for each time of day by [(post-pre exercise)-(post-pre control)] and were compared by paired t-test (P<0.05). Exercise hypotensive net effects (e.g., decreasing systolic, diastolic and mean blood pressure) occurred at both times of day, but systolic blood pressure reductions were greater after morning exercise (-7±3 vs. -3±4 mmHg, P<0.05). Exercise decreased cardiac output only in the morning (-460±771 ml/min, P<0.05), while it decreased stroke volume similarly at both times of day and increased heart rate less in the morning than in the evening (+7±5 vs. +10±5 bpm, P<0.05). Only evening exercise increased sympathovagal balance (+1.5±1.6, P<0.05) and calf blood flow responses to reactive hyperemia (+120±179 vs. -70±188 U, P<0.05). In conclusion, PEH occurs after exercise conducted at both times of day, but the systolic hypotensive effect is greater after morning exercise when circadian variations are considered. This greater effect is accompanied by a reduction of cardiac output due to a smaller increase in heart rate and cardiac sympathovagal balance.
منابع مشابه
مقایسه زمان فعالیت ورزشی (صبح و عصر) بر میزان تروپونین T پلاسمای مردان مبتلا به بیماری قلبی- عروقی
Background: Our body is under the influence of a 24-hour period which regulates body temperature, blood pressure, metabolism, hormone secretion and their functions. Thus, it is probable that while doing exercise or following that the function of the body varies in different parts of the day. The goal of the present study was to assess the effect of the time of exercise (morning or evening) on t...
متن کاملمقایسه پاسخ برخی نشانگرهای پیشگوییکننده بیماریهای قلبی و عروقی به انجام صبح و بعد از ظهر آزمون نوارگردان بروس، در زنان جوان
Background and Aim: Some physiological and psychological variables have a circadian rhythm or cyclical changes and many physiological responses to exercise, e.g. cardiovascular diseases (CVD) are somehow affected by their time of the day .Thus, .the present study aimed at finding out the effect of the time of the day on plasma levels of C-reactive protein (CRP) and lipid profile after one sessi...
متن کاملFractionated Concurrent Exercise throughout the Day Does Not Promote Acute Blood Pressure Benefits in Hypertensive Middle-aged Women
Hypertension is a chronic disease that affects about 30% of the world's population, and the physical exercise plays an important role on its non-pharmacological treatment. Anywise, the dose-response of physical exercise fractionation throughout the day demands more investigation, allowing new exercise prescription possibilities. Therefore, this study aimed to analyze the acute blood pressure (B...
متن کاملHypotensive response after resistance exercise leading to failure and not to failure in trained men
Hypertension is epidemic disease which post-exercise hypotension (PEH) is useful strategies for hypertension. The aim of present study was to investigate the effects of resistance exercise leading to failure (REF) and resistance exercise not to failure (NREF) on PEH phenomenon in trained men. Eight trained men (age: 22.12±1.81 yr; height: 179±3.44 cm; weight: 73.82±4.29 kg;...
متن کاملEffects of Acute Endurance Exercise Performed in the Morning and Evening on Inflammatory Cytokine and Metabolic Hormone Responses
PURPOSE To compare the effects of endurance exercise performed in the morning and evening on inflammatory cytokine responses in young men. METHODS Fourteen healthy male participants aged 24.3 ± 0.8 years (mean ± standard error) performed endurance exercise in the morning (0900-1000 h) on one day and then in the evening (1700-1800 h) on another day with an interval of at least 1 week between e...
متن کامل