College of Physical Education, Hubei Normal University, Huangshi, China.
Department of Food Science, Fu Jen Catholic University, New Taipei City, Taiwan.
Exp Physiol. 2023 Nov;108(11):1409-1421. doi: 10.1113/EP091429. Epub 2023 Sep 15.
The effect of different exercise intensities on the magnitude of post-exercise hypotension has not been rigorously clarified with respect to the metabolic thresholds that partition discrete exercise intensity domains (i.e., critical power and the gas exchange threshold (GET)). We hypothesized that the magnitude of post-exercise hypotension would be greater following isocaloric exercise performed above versus below critical power. Twelve non-hypertensive men completed a ramp incremental exercise test to determine maximal oxygen uptake and the GET, followed by five exhaustive constant load trials to determine critical power and W' (work available above critical power). Subsequently, criterion trials were performed at four discrete intensities matched for total work performed (i.e., isocaloric) to determine the impact of exercise intensity on post-exercise hypotension: 10% above critical power (10% > CP), 10% below critical power (10% < CP), 10% above GET (10% > GET) and 10% below GET (10% < GET). The post-exercise decrease (i.e., the minimum post-exercise values) in mean arterial (10% > CP: -12.7 ± 8.3 vs. 10% < CP: v3.5 ± 2.9 mmHg), diastolic (10% > CP: -9.6 ± 9.8 vs. 10% < CP: -1.4 ± 5.0 mmHg) and systolic (10% > CP: -23.8 ± 7.0 vs. 10% < CP: -9.9 ± 4.3 mmHg) blood pressures were greater following exercise performed 10% > CP compared to all other trials (all P < 0.01). No effects of exercise intensity on the magnitude of post-exercise hypotension were observed during exercise performed below critical power (all P > 0.05). Critical power represents a threshold above which the magnitude of post-exercise hypotension is greatly augmented. NEW FINDINGS: What is the central questions of this study? What is the influence of exercise intensity on the magnitude of post-exercise hypotension with respect to metabolic thresholds? What is the main finding and its importance? The magnitude of post-exercise hypotension is greatly increased following exercise performed above critical power. However, below critical power, there was no clear effect of exercise intensity on the magnitude of post-exercise hypotension.
不同运动强度对运动后低血压幅度的影响尚未通过代谢阈值得到严格阐明，这些代谢阈值将离散的运动强度域分开（即，临界功率和气体交换阈值（GET））。我们假设，在高于临界功率的情况下进行等热量运动比在低于临界功率的情况下进行等热量运动，运动后低血压的幅度会更大。12 名非高血压男性进行了斜坡递增运动试验，以确定最大摄氧量和 GET，然后进行了五次耗竭性恒负荷试验，以确定临界功率和 W'（临界功率以上的可用功）。随后，在四个离散强度下进行了标准试验，这些强度的总功相等（即等热量），以确定运动强度对运动后低血压的影响：10% 高于临界功率（10% > CP）、10% 低于临界功率（10% < CP）、10% 高于 GET（10% > GET）和 10% 低于 GET（10% < GET）。运动后下降（即最低运动后值）的平均动脉（10% > CP：-12.7 ± 8.3 与 10% < CP：v3.5 ± 2.9 mmHg）、舒张压（10% > CP：-9.6 ± 9.8 与 10% < CP：-1.4 ± 5.0 mmHg）和收缩压（10% > CP：-23.8 ± 7.0 与 10% < CP：-9.9 ± 4.3 mmHg）在运动后 10% > CP 时比所有其他试验都更大（所有 P < 0.01）。在低于临界功率的运动中，运动强度对运动后低血压幅度没有影响（所有 P > 0.05）。临界功率代表一个阈值，高于该阈值，运动后低血压的幅度会大大增加。新发现：本研究的核心问题是什么？代谢阈值对运动后低血压幅度的影响与运动强度有关吗？主要发现及其重要性是什么？在高于临界功率的运动后，运动后低血压的幅度大大增加。然而，在低于临界功率的情况下，运动强度对运动后低血压幅度没有明显影响。
