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Int J Sports Phys Ther
Int J Sports Phys Ther
2159
International Journal of Sports Physical Therapy
2159-2896
NASMI Website: International Journal of Sports Physical Therapy

34123546
23725
10.26603/001c.23725
Clinical Viewpoint
Blood Flow Restriction: Cause for Optimism, But Let’s Not Abandon The Fundamentals
Lorenz Dan DPT, PT, ATC, CSCS 1
1 LMH Health/OrthoKansas
Corresponding author: danielslorenz@gmail.com
2 6 2021
2021
16 3 962967
2 4 2021
10 5 2021
© The Author(s)
https://creativecommons.org/licenses/by-nc-sa/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike License (4.0) which permits non-commercial use, distribution, and reproduction in any medium, provided the original author and source are credited. If you remix, transform, or build upon this work, you must distribute your contributions under the same license as the original.

strength training
sports physical therapy
bfr
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pmcOne of the most popular modalities in sports physical therapy in recent memory is blood flow restriction (BFR) training. The concept of BFR dates back to the 1960’s, and BFR-related studies published in the literature started increasing in the early 2000’s. Its close relative, ischemic preconditioning, had been used even earlier than the 2000’s in non-traditional sports physical therapy populations, like cardiac disease, but is now being used as a recovery tool in sports medicine settings. As sports physical therapy professionals, we have a good reason to be excited about this modality. Many interventions we use or have used have little to no scientific basis or clinical research to support them. There are numerous trends that have a theoretical basis for use. Thus, it seems we tend to put practice before the scientific and/or clinical research support. BFR training has not only been supported scientifically regarding mechanisms of action in the literature, but also has support from clinical studies indicating that BFR helps to relieve pain,1,2 improve aerobic capacity,3–6 reduce the deleterious effects of immobilization,7,8 improve bone healing,9–11 and assist in the care of impairments in specific diagnoses like ACL reconstruction.12,13

Given that muscle weakness and atrophy are common impairments after musculoskeletal injury, BFR enables the sports physical therapist to mitigate atrophy and muscle weakness under low load conditions in order to minimize stress to healing tissues.14 The number of studies on the subject matter in peer-reviewed journals has exploded in the last six or seven years. The author of this viewpoint presented on the topic in 2015 and it was a novel concept to the audience and received with skepticism – for many of the current reasons. It can be overwhelming to wade through the science, the clinical studies, and the myriad of other considerations regarding BFR – safety/efficacy, indications/contraindications, cuff selection, etc. Complicating matters further is that whenever trendy interventions surface, it is tempting to use them for any and all populations – everyone wants the shiny new toy, so to speak. The danger of this approach, though, is that in lieu of using proven methods, it is enticing to utilize cutting edge approaches for any and all purposes. Therefore, the objective of this viewpoint is threefold. First, a review of physiologic responses to BFR compared to more traditional training methods will be discussed. Second, a summary of key considerations for BFR with particular emphasis on safety and risk of DVT’s will be reviewed. Last, a brief discussion about potential clinical usage and recommendations for implementing BFR.

It is beyond the scope of this clinical viewpoint to go into detail about the neural, mechanical, and metabolic mechanisms of increased strength and hypertrophy. There are several excellent review articles: Patterson et al.,15 Pearson et al.,16 and Hwang et al.17 for reviews on the mechanisms of BFR, and Schoenfeld et al.,18 Kraemer et al.,19 and Kraemer et al.20 for reviews on traditional loading, respectively. To summarize, both traditional loading for strength and hypertrophy as well as low-load training with BFR cause increases in muscle building materials – growth hormone, Insulin-like growth factors (IGF’s), Vascular Endothelial Growth Factor, mTORC1, and myogenic stem cells – all of which contribute to protein stimulus and muscle hypertrophy.21–23 When muscles are loaded up to 60% of one repetition maximum (1RM) or trained to failure, either could be aa potent stimulus for muscle hypertrophy.18 Strength is best trained with high loads, typically >80% 1RM for 3-4 sets in the 1-8 repetition range with long rest periods. In cases of the recovering athlete, high loads may not be appropriate or contraindicated. The evidence to date has shown that many of the benefits of traditional higher load training methods are similar or enhanced with low-load environments while using BFR. This is an exciting and clinically meaningful outcome. If we can get strength gains with loads that are as low as 20% of 1RM, this is significant for just about anyone in practice.

Several concerns are frequently raised regarding the risk of deep venous thrombosis (DVT)/safety and legality. The reader is referred to the recent paper by Bond et al24 discussed the risk of DVT’s when using BFR. Additionally, the Wells Criteria for DVT risk is a good reference for this topic.25 The fear of DVT is, at this time, more fear over facts. The author of this clinical viewpoint is not aware of any cases where a DVT was caused by BFR training. In a case study26 by Noto et al., a subject got an effort thrombosis in the upper extremity, but a review of the training in that study showed that the subject trained every day with occlusion for about an hour. Time under occlusion is an aspect of BFR that is a topic of debate. Surgical tourniquets are inflated to well over 100 mmHg on average, applied for about 2 hours, and have a complication rate of 0.04%.27 Most studies maintain occlusion, while other studies have allowed reperfusion between exercises or sets.28 Patterson et al.15 suggest 5-10 minutes of occlusion per exercise and suggest continuous or intermittent pressure. Discomfort is typically the reason for the need for reperfusion, particularly if higher pressures are being utilized. It is possible that allowing reperfusion between sets may allow greater volume to be achieved due to less discomfort. Depending how many exercises are being performed, the tolerance to the pressure of the subject, and whether or not failure is achieved, the author suggests that occlusion time be for about 10 minutes for resistance exercises. The author is not aware of any studies saying one should not go over 10 minutes, but current studies seem to show benefits are realized in 10 minutes. It appears that an occlusion time around 10 minutes is the “minimum effective dose” to realize the benefits of BFR. However, we do not know at this time if longer times are more efficacious or warranted. For aerobic conditioning, about 20 minutes is suggested, but again, we do not know if longer times are warranted. Most of the side effects are short-lived, such as petechiae, numbness, and potentially abrasions if the BFR cuff isn’t appropriately applied. The most notable side effect is likely discomfort. It is professional duty and responsibility to educate oneself on the scientific reasoning of a modality or treatment, application, relative indications, contraindications, and side effects. It is the responsibility of sports physical therapists to appropriately educate our patients and obtain their consent to treatment. Finally, thorough documentation is imperative, with or without BFR. In summary, BFR is safe when used appropriately & under proper safety guidelines.

BFR is approved in the practice acts for both physical therapists and athletic trainers by the APTA29 and NATA,30 respectively. There is currently no requirement for certification, nor is there any one device that is required to be used in exclusivity. It is important for the sports physical therapist to check state practice acts and ensure that key stakeholders like physicians, administrators/supervisors, and legal counsel are educated on the science, application, risks, and benefits of using BFR. Ultimately, the decision may not be made by practicing clinicians, but being informed is the most pragmatic approach.

At this time, BFR is most recommended to attenuate losses in hypertrophy and strength in conditions when traditional, high loads are either not indicated nor appropriate given the pathology in question. In addition, post-operative conditions of the lower extremity or injuries requiring immobilization are ideal candidates for BFR. BFR has been shown to have an additive effect when used with neuromuscular electrical stimulation (NMES)31–33 and the sports physical therapist should consider using it as an adjunct to traditional use of NMES. BFR is helpful for reducing pain and increasing strength in those whose symptoms may be exacerbated by high loads, such as advanced osteoarthritis of the knee;34,35 however, it should be noted that the benefit of BFR in this particular population is in question in regards to clinical outcomes.36 In the upper extremity, the benefits of improved strength and hypertrophy37,38 may be realized in rotator cuff repairs, Bankart repairs, SLAP repairs, or bicep/pectoral tendon repairs, but there is a less data on diagnosis-specific benefits of BFR in the upper extremity. Regardless of diagnosis, BFR should be used as a supplement to or to augment traditional loading progressions rather than a replacement of these methods.

While it appears that higher arterial occlusion pressures (AOP) are more beneficial, a range of 40-80% of AOP could be used if greater pressures are not tolerated by the patient or athlete. AOP should be determined by either Doppler ultrasound or pulse oximetry in the absence of personalized systems. Loading should be anywhere from 20-40% of one repetition-maximum (1RM), and this could be determined by a 10RM estimate, using the uninvolved limb as reference, or a load equivalent to 2-3 on the RPE scale. Usually, a minimum of 2-3 sets but up to 5 sets per exercise are recommended with anywhere from 45-75 repetitions per exercise. The lower end of this repetition scheme is assuming at least 1-2 sets are performed to failure.39 One or two sets to failure is encouraged to maximize the hypertrophic effects.39,40 While the primary indications are listed above, there is evidence that BFR can be used to augment aerobic training at 30-50% of heart rate reserve (HRR) through either walking or use of other cardiovascular activities such as cycling or elliptical trainers.3–7 Additionally, studies have shown a benefit of BFR for improvements in VO2 Max.41–44 The benefits of BFR for performance training are likely indirect. Strength is the foundation of athletic performance and, therefore, increasing strength should improve power, but this may or may not transfer to actual improvements in sports performance. Thus, more power during strength training exercises may not transfer to improvements in batting average, shot percentage, or rushing yards, for example. It is not recommended that BFR be used prior to explosive activities due to BFR exercises being performed at or near volitional fatigue. While it is early to make any definitive conclusions, there is some early evidence that ischemic preconditioning may enhance recovery after athletic performance,45–49 but evidence to the contrary exists as well.50,51

While BFR appears to be a very promising and exciting innovation in our field, it is important to keep in mind that accepted, proven training practices and principles are not abandoned. Prior to incorporation of BFR training clinicians should ask themselves several questions. Why are more traditional methods not working? Has traditional exercise been dosed and loaded correctly? Has the clinician adhered to the principle of progressive overload? Is there an issue with programming that is prohibiting making the desired improvements? When an athlete is appropriate for higher loading, they should have higher loads. BFR should augment or be a supplement to traditional training methods when appropriate, not a replacement. While there a number of encouraging, positive studies on BFR, we still have so much to learn. The author encourages the reader to investigate the science, mechanisms, applications, clinical usage, and seek answers to clinical inquiries – but continue using proven, evidence supported methods for resistance training.
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