The combination of low-load resistance training [or more recently, neuromuscular electrical stimulation (NMES)] with a moderate local blood flow restriction (BFR) is becoming a widespread training and rehabilitation method. Scientific data indicate the overall safety of BFR, at least in healthy young people. However, it has been associated with side effects, usually minor, and further research is warranted regarding the safety and efficacy of this technique, especially in clinical populations. We found 3 syncope/presyncopal episodes among 21 healthy people (9 men), all occurring in men and during familiarization sessions (in which BFR was applied alone) but not thereafter (BFR sessions combined with NMES): 1 subject experienced a brief syncope and 2 other subjects exhibited presyncopal symptoms (sweating, lightheadedness, and pallor). Our cases are evidence that cardiovascular complications may emerge during BFR. Caution is thus needed in the application of BFR, and gentle familiarization with this training modality is also recommended.

Juan Martín-Hernández

Alejandro Santos-Lozano

Carl Foster

Alejandro Lucia

Clinical Journal of Sport Medicine

​CLINICAL JOURNAL OF SPORT MEDICINE 是一本面向对运动医学实践有主要兴趣的临床医生出版的国际参考期刊。该杂志发表原创研究和评论，涵盖所有年龄和体育和锻炼参与水平的健康和身体有挑战的个体的诊断、治疗和康复。

The Clinical Journal of Sport Medicine is an international reference journal aimed at clinicians with a primary interest in the practice of sports medicine. The journal publishes original research and reviews covering the diagnosis, treatment, and rehabilitation of individuals of all ages and levels of sports and exercise participation, including those with health challenges.

《Clinical Journal of Sport Medicine》是一本国际参考期刊，主要面向对运动医学实践感兴趣的临床医生。该期刊发表原创研究和评论，涵盖所有年龄段及不同体育和锻炼参与水平的健康个体及身体有挑战的个体的诊断、治疗和康复。

Category	Quartile
医学	3
医学, 骨科	3
医学, 生理学	3
医学, 运动科学	4

Syncope Episodes and Blood Flow Restriction Training

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