Contraindications
Who Should Not Use BFR?
Blood Flow Restriction (BFR) training has become one of the most researched rehabilitation and performance interventions available today. Over the past two decades, hundreds of studies have demonstrated that BFR can improve muscle strength, increase muscle mass, reduce pain, enhance aerobic capacity, and accelerate rehabilitation while using significantly lighter loads than traditional resistance training (1,3) Despite its impressive safety profile when applied correctly, BFR is not appropriate for everyone.
Like any therapeutic intervention, BFR requires appropriate patient screening before application. Understanding contraindications allows clinicians to minimize risk while ensuring that patients who are appropriate candidates receive the greatest possible benefit. This article reviews the major contraindications to BFR and explains why these conditions warrant avoiding or delaying BFR until further medical evaluation.
Safety First: BFR Is Safe When Applied Correctly
One of the most common misconceptions surrounding BFR is that restricting blood flow increases the likelihood of serious vascular complications.
Current evidence does not support this concern.
When individualized limb occlusion pressure (LOP) is used and patients are appropriately screened, BFR has demonstrated an excellent safety profile with very low rates of adverse events (2,3). Patients with certain cardiovascular or vascular conditions may possess an elevated baseline risk that outweighs the potential benefits of BFR.
1. Previous DVT or PE
Perhaps the most widely recognized contraindication is a previous history of:
Deep vein thrombosis (DVT)
Pulmonary embolism (PE)
These individuals have already demonstrated a predisposition toward abnormal clot formation. Although modern evidence suggests that BFR itself does not appear to increase markers of coagulation in healthy individuals, patients with a previous thrombotic event remain at elevated baseline risk (2,3). BFR temporarily alters venous return, and most experts recommend avoiding BFR in patients with a:
Previous unprovoked DVT
Previous PE
Active thrombotic disease
Known hypercoagulable conditions
Unless specifically cleared by the treating physician or vascular specialist, these patients should generally not participate in BFR training.
2. Previous Stroke
Patients with a history of stroke represent another population requiring careful consideration.
Stroke survivors frequently present with:
Altered vascular function
Hypertension
Reduced cardiovascular reserve
Increased risk of recurrent cerebrovascular events
While emerging neurological rehabilitation research has shown promising results using BFR in carefully selected individuals, routine implementation without physician clearance is not recommended. The concern is not necessarily that BFR directly causes stroke. Rather, clinicians should recognize that individuals with previous cerebrovascular disease already possess elevated cardiovascular risk and until further evidence becomes available, previous stroke should generally be considered a contraindication unless managed within a multidisciplinary medical setting (4,5)
3. Uncontrolled High Blood Pressure
Hypertension affects nearly half of adults worldwide. Fortunately, controlled hypertension is not an absolute contraindication. The greater concern involves uncontrolled hypertension. Individuals with persistently elevated blood pressure may experience excessive cardiovascular stress during exercise regardless of whether BFR is used. Current recommendations generally advise avoiding BFR until blood pressure has been medically managed.
Examples include patients with:
Resting systolic blood pressure consistently above 160 mmHg
Poorly controlled hypertension despite medication
Hypertensive crisis
Significant blood pressure variability
Once blood pressure is adequately controlled and physician clearance is obtained, BFR may become an appropriate rehabilitation option.
4. Pregnancy
Pregnancy remains a commonly accepted contraindication for BFR. This recommendation is based primarily on precaution rather than evidence demonstrating harm. Pregnant individuals undergo significant physiological adaptations including changes in:
Blood volume
Hormonal regulation
Coagulation
Vascular function
Blood pressure
Pregnancy is also naturally associated with an increased risk of thromboembolic events. High-quality safety research involving pregnant populations is lacking, expert recommendations consistently advise against using BFR during pregnancy. Until stronger evidence becomes available, clinicians should select alternative exercise interventions that possess established safety profiles during pregnancy.
5. Peripheral Arterial Disease (PAD)
Severe peripheral arterial disease (PAD) represents one of the strongest vascular contraindications for BFR. PAD occurs when narrowed arteries reduce blood flow to the limbs.
Symptoms may include:
Leg pain while walking
Reduced circulation
Delayed wound healing
Cool extremities
Diminished pulses
Since BFR intentionally reduces arterial inflow to some degree, applying BFR to limbs already experiencing impaired circulation may further compromise tissue perfusion. For this reason, severe PAD is generally considered a contraindication to BFR. Patients suspected of having PAD should first undergo vascular evaluation before any occlusion-based intervention is considered.
6. Severe Varicose Veins
Varicose veins are extremely common. Patients with mild varicose veins are NOT automatically excluded from BFR. Patients with mild varicose veins should use lower pressures when applying BFR.
The concern with varicose veins lies with:
Severe varicosities
Symptomatic venous insufficiency
Significant venous disease
These individuals may already possess impaired venous return. Additional venous restriction through BFR may place unnecessary stress on compromised veins. Clinical judgment should therefore be exercised. When severe venous disease is present, BFR should generally be avoided unless approved by the treating vascular specialist.
Relative vs. Absolute Contraindications
Not every medical condition represents an absolute contraindication.
Some conditions require:
Physician clearance
Lower exercise intensity
Conservative pressures
Increased monitoring
These are often referred to as relative contraindications.
Examples may include:
Stable cardiovascular disease
Diabetes
Older age
Certain neurological disorders
These patients may still benefit from BFR when appropriate screening, individualized limb occlusion pressure, and clinical monitoring are used. The distinction between absolute and relative contraindications is one of the reasons thorough patient screening is essential before beginning BFR.
The Importance of Individualized Screening
Modern BFR should never involve simply wrapping a limb as tightly as possible.
Instead, clinicians should:
Obtain a detailed medical history.
Screen for vascular and cardiovascular disease.
Measure individualized limb occlusion pressure (LOP).
Select appropriate exercise intensity.
Monitor patient comfort and symptoms throughout treatment.
Stop treatment immediately if concerning signs develop.
Individualization dramatically improves both safety and effectiveness.
Warning Signs to Stop BFR Immediately
Although adverse events are uncommon, clinicians should discontinue BFR immediately if patients experience:
Chest pain
Shortness of breath
Dizziness
Loss of consciousness
Severe numbness
Excessive pain
Cyanosis or marked discoloration distal to the cuff
Persistent loss of circulation after cuff removal
Patients experiencing these symptoms should undergo immediate medical evaluation.
BFR Is About Risk Management
One of the strengths of modern BFR is its flexibility. Pressure can be individualized. Exercise intensity can be adjusted. Protocols can be modified based on patient tolerance but, no amount of protocol adjustment can overcome an inappropriate patient selection. Successful BFR begins long before the cuff is inflated, it begins with appropriate screening.
Clinical Takeaway
Blood Flow Restriction training has transformed rehabilitation, recovery, and performance by allowing patients and athletes to achieve meaningful adaptations with significantly lighter loads. When prescribed appropriately, it is one of the safest and most effective tools available to clinicians.
At the same time, BFR is not a one-size-fits-all intervention. Its another tool for the tool box. Patients with a history of deep vein thrombosis or pulmonary embolism, previous stroke, uncontrolled hypertension, pregnancy, severe peripheral arterial disease, or severe varicose veins require additional consideration and, in many cases, should avoid BFR unless specifically cleared by an appropriate medical specialist.
Ultimately, the goal of BFR is not simply to restrict blood flow, it is to improve strength and functional outcomes safely. Appropriate screening, individualized limb occlusion pressure, evidence-based prescription, and sound clinical reasoning remain the foundation of safe and effective BFR practice.
References
Hughes, L., Paton, B., Rosenblatt, B., Gissane, C., & Patterson, S. D. (2017). Blood flow restriction training in clinical musculoskeletal rehabilitation: A systematic review and meta-analysis. British Journal of Sports Medicine, 51(13), 1003–1011. https://doi.org/10.1136/bjsports-2016-097071
Nascimento, D. C., Petriz, B., da Cunha Oliveira, S., et al. (2022). Blood flow restriction exercise: Considerations of methodology, application, and safety. Frontiers in Physiology, 13, 808622.https://doi.org/10.3389/fphys.2022.808622
Patterson, S. D., Hughes, L., Head, P., et al. (2019). Blood flow restriction exercise: Considerations of methodology, application, and safety. Frontiers in Physiology, 10, 533.https://doi.org/10.3389/fphys.2019.00533
Rolnick, N., & Schoenfeld, B. J. (2020). Blood flow restriction training and the exercise professional: Practical considerations and safety recommendations. Strength and Conditioning Journal, 42(3), 19–30. https://doi.org/10.1519/SSC.0000000000000534
Scott, B. R., Loenneke, J. P., Slattery, K. M., & Dascombe, B. J. (2016). Exercise with blood flow restriction: An updated evidence-based approach for enhanced muscular development. Sports Medicine, 46(3), 313–325. https://doi.org/10.1007/s40279-015-0405-2
Disclaimer: This article is intended for educational purposes only and should not replace individualized medical advice. Blood Flow Restriction training should be prescribed by appropriately trained healthcare or exercise professionals after a comprehensive medical screening.
