PURPOSE Research on intermittent training has mainly focused on the effects of exercise intensity while overlooking the specific impact of the modulations associated with alternating exercise and recovery. This study investigated how the frequency of modulations during moderate-intensity exercise affects post-exercise vagal reactivation. METHODS Healthy, active females and males aged 18-39 years were recruited for the study. Participants completed three treadmill running sessions on separate days. Each moderate-intensity session accumulated 30 min at 90% of the intensity associated with the second ventilatory threshold and were performed as either high-frequency intermittent (HiFi; 15 x [2 min + 2 min recovery]), low-frequency intermittent (LoFi; 5 x [6 min + 2 min recovery]), or continuous training (MICT; 1 x 30 min). Heart rate recovery (HRrec) at 1 min and heart rate variability recovery (HRVrec; lnRMSSD) were assessed in response to submaximal constant-speed tests performed prior to (CST1) and following (CST2) each of the exercise sessions. HRrec, HRVrec, blood lactate (BLa), and blood pressure were also collected during the exercise sessions. RESULTS Twenty-one individuals (8 females, 13 males) participated in the study. HRrec from CST2 was faster in HiFi vs. MICT (p < 0.001), while HRVrec post-CST2 was higher following HiFi vs. both LoFi (p = 0.024) and MICT (p < 0.001). BLa increased in all conditions (p = 0.007) but remained lower during HiFi compared to LoFi and MICT (both p < 0.001). Diastolic blood pressure did not change during exercise with HiFi (p = 0.939) but decreased during LoFi (p = 0.006) and MICT (p = 0.008). CONCLUSIONS Exercise pattern influences the physiologic response to exercise. Higher frequencies of modulations can preserve vagal activity and expedite post-exercise recovery, suggesting moderate-intensity intermittent exercise as a potential strategy to mitigate autonomic impact and acute physiological stress while maintaining total work performed.

中文翻译：

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研究运动模式在急性心血管恢复中的作用。


目的 关于间歇性训练的研究主要集中在运动强度的影响上，而忽略了与交替运动和恢复相关的调节的具体影响。本研究调查了中等强度运动期间的调制频率如何影响运动后迷走神经再激活。方法 该研究招募了 18-39 岁的健康、活跃的女性和男性。参与者在不同的日期完成了三节跑步机跑步课程。每个中等强度训练以与第二通气阈值相关的 90% 强度累积 30 分钟，并以高频间歇性（HiFi;15 x [2 分钟 + 2 分钟恢复]）、低频间歇性（LoFi;5 x [6 分钟 + 2 分钟恢复]）或持续训练（MICT;1 x 30 分钟）进行。评估 1 分钟时的心率恢复 （HRrec） 和心率变异性恢复 （HRVrec;lnRMSSD），以响应在每次锻炼之前 （CST1） 和之后 （CST2） 进行的次最大恒速测试。在运动期间还收集了 HRrec 、 HRVrec 、血乳酸 （BLa ） 和血压。结果 21 人 （8 名女性，13 名男性） 参与了这项研究。CST2 的 HRrec 在 HiFi 中比 MICT 更快 （p < 0.001），而 CST2 后的 HRVrec 在 HiFi 后高于 LoFi （p = 0.024） 和 MICT （p < 0.001）。BLa 在所有条件下均增加 （p = 0.007），但与 LoFi 和 MICT 相比，在 HiFi 期间保持较低 （p < 0.001）。舒张压在使用 HiFi （p = 0.939） 运动期间没有变化，但在 LoFi （p = 0.006） 和 MICT （p = 0.008） 期间下降。结论 运动模式影响对运动的生理反应。 更频繁的调节可以保持迷走神经活动并加速运动后恢复，这表明中等强度的间歇性运动是减轻自主神经影响和急性生理应激的潜在策略，同时保持总负荷。