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Syncope Episodes and Blood Flow Restriction Training.

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Blood flow restriction (BFR) training combined with exercise is popular but can cause fainting. Careful familiarization is advised, especially for men, to mitigate potential cardiovascular side effects during BFR application.

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Area of Science:

  • Exercise Physiology
  • Sports Medicine
  • Rehabilitation Science

Background:

  • Blood flow restriction (BFR) combined with low-load resistance training or neuromuscular electrical stimulation (NMES) is increasingly used in training and rehabilitation.
  • Existing data suggest BFR is generally safe for healthy young individuals.
  • Further research is needed on BFR's safety and efficacy in clinical populations.

Observation:

  • Three cases of syncope (fainting) or presyncope (near fainting) occurred in 21 healthy participants (9 men).
  • All episodes happened during initial familiarization sessions when BFR was applied alone.
  • No syncope or presyncope events were reported when BFR was combined with NMES in subsequent sessions.

Findings:

  • The study identified potential cardiovascular complications, specifically syncope/presyncope, associated with BFR application.
  • These episodes were transient and occurred only during the initial BFR familiarization phase in male participants.
  • The combination of BFR with NMES did not result in any reported cardiovascular events.

Implications:

  • The findings highlight the need for caution when implementing BFR, particularly during initial exposure.
  • Gentle familiarization protocols are recommended to minimize the risk of adverse cardiovascular events.
  • These observations underscore the importance of monitoring and tailored application of BFR, especially in diverse populations and clinical settings.