Although evidence regarding the effects of high‐intensity interval training (HIIT) on mental health has increased in recent years, there is still no consensus regarding the effects of HIIT on the symptoms of depression and anxiety in a healthy population. Therefore, this systematic review aimed to investigate the effects of HIIT on depressive and/or anxiety symptoms in healthy individuals. The following four databases were searched: PubMed, Scopus, Embase, and PsycINFO. Only randomized clinical trials (RCTs) were included. We performed a random‐effects meta‐analysis based on standardized mean difference (SMD). The risk of bias was assessed using the RoB 2.0 tool, and the certainty of the evidence was evaluated based on recommendations GRADE. Eight RCTs evaluating 471 participants (81% female) were considered eligible for inclusion. The results of the meta‐analysis showed that HIIT‐based interventions had no significant effect on reducing anxiety (SMD = −0.17; 95% CI: −0.53, 0.19; p = 0.27) and depressive symptoms (SMD = −0.38; 95% CI: −1.06, 0.30; p = 0.17) compared with the passive control group. In conclusion, HIIT does not improve symptoms of depression and anxiety in healthy individuals. This finding is based on evidence of very low certainty. Therefore, the evidence is still not consistent enough to support HIIT as a viable strategy to reduce both outcomes because of the limited number of included studies and the overall quality of evidence.

中文翻译：

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高强度间歇训练对健康个体抑郁和焦虑症状的影响：随机临床试验的系统回顾和荟萃分析

尽管近年来有关高强度间歇训练（HIIT）对心理健康影响的证据有所增加，但关于 HIIT 对健康人群抑郁和焦虑症状的影响仍没有达成共识。因此，本系统综述旨在研究 HIIT 对健康个体抑郁和/或焦虑症状的影响。检索了以下四个数据库：PubMed、Scopus、Embase 和 PsycINFO。仅纳入随机临床试验（RCT）。我们进行了基于标准化均差（SMD）的随机效应荟萃分析。使用 RoB 2.0 工具评估偏倚风险，并根据建议 GRADE 评估证据的确定性。评估 471 名参与者（81% 女性）的 8 项随机对照试验被认为有资格纳入。荟萃分析结果显示，基于 HIIT 的干预措施对减轻焦虑没有显着效果（SMD = -0.17；95% CI：-0.53，0.19；p= 0.27）和抑郁症状（SMD = -0.38；95% CI：-1.06，0.30；p= 0.17）与被动对照组相比。总之，HIIT 并不能改善健康个体的抑郁和焦虑症状。这一发现是基于质量非常低的证据。因此，由于纳入的研究数量和证据的整体质量有限，证据仍然不够一致，不足以支持 HIIT 作为减少这两种结果的可行策略。