- Study protocol
- Open Access
- Open Peer Review
Effects of blood flow restriction exercise with very low load and low volume in patients with knee osteoarthritis: protocol for a randomized trial
Trials volume 20, Article number: 135 (2019)
Knee osteoarthritis (OA) is characterized by chronic pain, physical dysfunction, and reduced quality of life. Low-load resistance exercises with blood flow restriction (BFR) have presented results similar to those of high-intensity resistance exercise (HIRE) without BFR provided that the exercise volume in both is paired. However, it is unclear whether BFR exercise with reduced load and volume generates clinical improvements similar to those of HIRE. The aim of the proposed study is to evaluate the effects of BFR resistance exercise with very low load and low volume against HIRE in patients with knee OA for the outcomes of knee pain, muscle performance, physical function, disease severity, quality of life, perceived exertion during the exercises, adherence, and patient satisfaction with treatment.
This two-arm, prospectively registered, randomized controlled trial with blinded assessors and volunteers will involve 40 patients with knee OA. Two weekly treatment sessions will be provided for 12 weeks. Patients will perform very low-load (10% of 1-RM) and low-volume BFR exercise or HIRE (60% of 1-RM) for strengthening thigh muscles. The primary outcome will be the knee pain measured after 12 weeks of treatment. The secondary outcomes include knee pain 6 months after randomization, physical function, disease severity, quality of life, muscle performance, knee pain and perceived exertion during exercise, adherence, and patient satisfaction with treatment.
If the improvements in the outcomes are similar in the two groups, BFR exercise with reduced load and volume may be an interesting alternative in the treatment of knee OA, especially when exercises with high loads generate joint pain.
Registro Brasileiro de Ensaios Clínicos (REBEC), RBR-6pcrfm. Registered on July 10, 2018.
Osteoarthritis (OA) is the most common type of arthritis and is characterized by inflammation and major structural changes in the joint [1, 2]. This condition is debilitating because of pain and physical disability, leading to a significant reduction in quality of life . The knee joint is strongly affected by OA, and the weakness of the quadriceps muscle is a major risk factor for knee OA .
Strengthening knee extensor muscles is recommended as a key point in reducing pain and disability in these patients , and resistance exercises with loads greater than 60% of 1 maximal repetition (1-RM) are classically prescribed to gain strength [6, 7]. However, movements with high loads in the knee with OA can aggravate pain, swelling, and inflammation  and consequently reduce adherence to exercise . Resistance exercise with blood flow restriction (BFR) has recently been considered in the treatment of knee OA [10, 11]. BFR resistance exercise is usually performed with lower load (20–30% of 1-RM) combined with a pneumatic cuff inflation that reduces arterial flow and limits the venous return, thus elevating metabolic stimulus in working muscles .
BFR exercise may be useful in knee OA treatment because of the possibility of strength gains associated with lower levels of pain, perceived exertion, overload, and joint stress during the training sessions compared with high-intensity (≥60% of 1-RM) resistance exercise (HIRE) without BFR [13,14,15,16]. However, it is unclear whether BRF is really required, even in resistance exercises with loads less than 30% of 1-RM [8, 17]. In subjects with knee OA, 8 weeks of resistance training with high (60% of 1-RM) or very low (10% of 1-RM) load without BFR induced similar improvement in pain and muscle function, as the total exercise volume (series × repetitions × load) was paired . In addition, regardless of the load (20% or 50% of 1-RM), exercise volume, or BFR, healthy and untrained individuals presented similar strength increases after 8 weeks of resistance training in which the repetitions were performed until failure .
Importantly, in most studies on BFR exercise for knee pain, despite the low load (20–30% of 1-RM), the total volume is very close to [18, 19] or greater than [15, 20] the HIRE volume (~60% of 1-RM) because of a greater number of repetitions in BFR exercise. Thus, it is unclear whether the strength gains promoted by BFR exercise in subjects with knee OA are due to the additional metabolic stimulus promoted by BFR or only to the similar volume when compared with HIRE.
Therefore, this study aims to evaluate the effects of BFR resistance exercise with very low load and low volume against HIRE in patients with knee OA for the outcomes of knee pain, muscular performance, physical function, and quality of life. An additional objective is to identify which exercise protocol will induce lower levels of knee pain and perceived exertion during the exercises and greater adherence and patient satisfaction with treatment.
This is a prospectively registered, two-arm randomized placebo-controlled trial with concealed allocation, blinded measurers and volunteers, intention-to-treat analysis, and 3 months of follow-up (Fig. 1). Subjects with knee OA will be recruited via online media advertisement, personal invitation, telephone, and SMS. Volunteers will be randomly allocated to the BFR exercise group or HIRE group, and the outcome measures will be evaluated in the time points shown in Table 1.
Analyses of inclusion criteria, getting informed consent, data collection, and statistical analyses will be carried out by researchers blinded to group allocation. Participants will receive oral and written instructions about study risks and benefits and sign a consent form. All personal data will be confidential. The study has obtained ethical approval from the Research Ethical Committee of Universidade Federal do Rio Grande do Norte (CAAE: 91753618.4.0000.5537). The trial was prospectively registered at the Registro Brasileiro de Ensaios Clínicos (RBR-6pcrfm). All participants will sign an informed consent form prior to participation. The study follows the SPIRIT (Standard Protocol Items: Recommendations for International Trials) 2013 checklist  (Fig. 2 and Additionalfile 1) and the TIDieR (Template for Intervention Description and Replication) .
Inclusion and exclusion criteria
A total of 40 men and women with unilateral or bilateral knee OA diagnosed according to the American College of Rheumatology criteria will be considered eligible if they:
are at least 50 years of age;
are in the postmenopausal period (for women);
are between 1.50 and 1.75 m in height;
have a body mass index between 18.5 and 35 kg/m2;
have moderate to very severe knee OA (score between 5 and 13 on the Lequesne Questionnaire);
have a score of at least 24 on the Mini-Mental State Examination;
do not have peripheral vascular disease, systolic blood pressure greater than 160 or less than 100 mm Hg, diastolic blood pressure greater than 100 mm Hg, deep vein thrombosis, diabetes, history of myocardial infarction, stroke in the previous year, or history of cancer that has generated limitations to exercise;
do not have other orthopedic/neurological diseases that affect gait and do not present any other inflammatory myoarticular disease;
have not undergone surgery or any invasive procedure on the knees in the previous 6 months;
have not participated in physiotherapeutic treatment or lower-limb strengthening programs in the past 3 months;
are not practicing regular physical activity (two or more times per week) for lower limbs (except for those who only practice walking).
Participants will be excluded if they:
experience pain that completely prevents them from performing the exercises proposed by two consecutive or three non-consecutive sessions or refuse to remain in the study;
begin taking specific medications that are for OA or that interfere with study outcomes;
begin to exercise or perform other treatment modalities for knee OA after initiating treatment.
Patients will be able to maintain treatment with stable doses of anti-inflammatory or other medications of regular use in the 3 months prior to the start of the study [15, 23] but should avoid using medications on evaluation days. Subjects who discontinue participation in the study will be invited to participate in the assessments 3 months after the start of treatment, and 6 months after the randomization. Thus, all individuals will be included in the intention-to-treat analysis. Therapists who deliver the intervention will be eligible if they have undergone specific training for the treatment protocol.
Volunteers included will be randomly allocated to BFR exercise or HIRE groups by using the website www.randomization.com. Balanced permutations in blocks with respect to the presence of unilateral or bilateral knee OA will be used. Participant allocation will be concealed in sequentially numbered and sealed opaque envelopes prepared prior to the study by a research assistant, who will not be involved in the study.
The intervention will consist of two weekly sessions with about 60 min of duration each during 12 weeks for a total of 24 sessions. The volunteers will be re-evaluated after 12 weeks and from then on will be guided to practice exercises according to their own volition . In both groups, the sessions will be started with 5 min of light-intensity warm-up on a stationary bike. All subjects included will be instructed not to initiate regular exercises beyond treatment sessions [8, 18]. Both groups will perform bilateral strengthening of the thigh muscles through squatting exercises on the hack machine (angle between 0° and 60° of knee flexion) and leg extension exercises (angle between 90° and 45° of knee flexion) [11, 20]. These amplitudes of movement were selected to minimize the load of the patellofemoral joint during the exercises .
In addition to exercises to strengthen the thigh muscles, trunk, hip, and calf exercises will be performed for both groups. High- or low-intensity exercises for strengthening thigh muscles are strongly recommended . Although other studies have focused only on strengthening thigh muscles [8, 11, 18, 20], we chose an overall treatment because of the pathophysiology of knee OA  and because there is strong evidence that associating knee exercise and training of proximal and distal muscles to this joint is effective in patients with knee pain [27, 28]. The detailed exercise protocol is shown in Table 2.
Loads of 10% and 60% 1-RM in the BFR exercise and HIRE groups, respectively, will be estimated (1-RM estimated) from the maximum load that can be overcome in 7–10 repetitions (7–10 RM test)  based on the Brzycki equation, (W/(1.0278–0.0278 × R), where W refers to weight used in the repetitions until failure and R refers to repetitions to failure [29, 30]. The load will be readjusted every 3 weeks with a 2- to 4-day interval after the last treatment session to prevent residual exercise fatigue from interfering with the 7–10 RM test. Five minutes of warm-up will be performed on a stationary bike before the 7–10 RM test [20, 31]. In relation to the 1-RM test, the 7–10 RM test has the advantage of minimizing the effect of pain on maximum force generation .
Participants will be advised that knee pain or discomfort during exercise is normal and that this does not necessarily cause joint damage . All exercises should be performed with pain levels between 0 and 5 on the visual analog scale (VAS) defined as acceptable pain. The session will be interrupted if the patient reports pain greater than 5 or is unable to complete the exercise . The load will be reduced by 20% (relative to 60% of estimated 1-RM) in the HIRE group if the pain prevents the volunteers from completing the exercise .
Blood flow restriction exercise
The BFR exercise group will perform the squatting on the hack machine and leg extension combined with a BFR corresponding to 60% of total restriction pressure (TRP) in both thighs . The TRP will be individually determined to generate similar metabolic stimulus between participants . After 10 minutes of rest in a climatized room (between 23° and 25 °C), the TRP will be determined with volunteers positioned in supine decubitus with their upper and lower limbs relaxed. The transducer (5 to 10 MHZ) of a portable vascular Doppler (DV 2001, MEDPEJ, Ribeirão Preto, Brazil) will be positioned at the ankle at a mean distance between medial malleolus and calcaneus tendon to capture the auscultatory signal of the posterior tibial artery. A manufactured pneumatic cuff (10 cm width and 80 cm length) will be positioned on the proximal end of the thigh [31, 33] and inflated based on a previous protocol . The TRP will be readjusted every 3 weeks.
The same cuff used in the TRP evaluation will be inflated in the proximal end of the thigh immediately before the exercises (squatting in the hack machine and extension of the leg) and will remain inflated during the interval rest between sets. The cuff will be removed during the 2-min interval between exercises. Fluctuations in prescribed pressure (60% of TRP) will be monitored and regulated by the therapist . The number of repetitions completed in each series will be monitored to check whether the total proposed volume was reached. The total duration of the BFR will be about 5 min per exercise.
The load during the squatting exercises on the hack machine and leg extension will be 10% of the estimated 1-RM  with 1 × 30 and 3 × 15 repetitions to be performed with a 30-s interval between sets [14, 15, 18, 20]. The total volume (load × repetitions × series) for each exercise per session will be estimated 1-RM × 0.1 × 75 = estimated 1-RM × 7.5 kg.
High-intensity resistance exercise
The HIRE group will perform 3 × 8 repetitions with 60% 1-RM for squatting on the hack machine and leg extension exercises  with an interval of 30 s between repetitions. Total volume (load × repetitions × series) for each exercise per session will be 1-RM estimated × 0.6 × 24 = 1-RM estimated × 14.4 kg. In the HIRE group, a BFR placebo with the same cuff used in the BFR exercise group but inflated with a minimum pressure (10 mm Hg) will be applied. This BFR level will not affect the number of repetitions per session .
The primary outcome is knee pain at rest and during the 30-s chair stand test and will be measured by using the VAS from 0 to 100 mm, where “0 mm” means no pain and “100 mm” means maximum pain already experienced.
Secondary outcomes are knee pain 3 months after the end of treatment, physical function, disease severity, quality of life, muscle performance, knee pain and effort perceived during exercises, patient adherence, and satisfaction with treatment.
Knee pain 3 months after the end of treatment will be measured by VAS, as described in the primary outcome.
Physical function will be evaluated through tests recommended by the Osteoarthritis Research Society International: 30-s chair stand test, 40-m fast-paced walk test, stair climb test, and timed up-and-go test .
Disease severity will be measured by Lequesne’s algofunctional questionnaire, a tool composed of 10 questions regarding pain, discomfort, and function. The sum of the scores is classified as little (1–4 points), moderate (5–7 points), severe (8–10 points), very severe (11–13 points), and extremely severe (≥14 points) dysfunction .
Quality of life will be evaluated through the SF-36 questionnaire, a tool composed of 36 items regarding functional capacity, physical aspects, pain, general health, vitality, social aspects, emotional aspects, and mental health. The total score varies from 0 to 100, and higher indexes are related to better quality of life .
Bilateral muscle performance measures will be the 7–10 RM test, isometric and isokinetic torque, and rate of torque development (RTD) of knee flexors and extensor muscles. Participants will be instructed to report any pain during the assessments during these measures and whether pain has prevented them from achieving maximum strength . The 7–10 RM test will be performed as previously described to determine the estimated 1-RM.
Isometric and isokinetic torque will be evaluated by isokinetic dynamometer (Biodex Multi-Joint System 3, Biodex Medical System Inc., Shirley, NY, USA) and conducted by a trained researcher. To minimize the possible influence of fatigue on muscle performance, there will be at least a 2-day interval between the 7–10 RM test and torque assessments. A 5-min warm-up will be performed before the evaluations on a stationary bicycle followed by a pre-test (three isometric and isokinetic sub-maximal repetitions). The volunteers will be positioned in the isokinetic dynamometer chair following the recommendations of the equipment manufacturer and with the dynamometer rotation axis aligned with the rotation axis of knee joint (lateral femoral epicondyle), and the torque evaluations will be initiated on the non-affected side (or on the less affected side for subjects with bilateral OA).
Isometric torque will be evaluated first. The subjects will perform three maximal isometric actions with the knee flexed at 60° for extensor analysis and 35° for knee flexor analysis (0° = total extension). Volunteers will be previously and carefully guided with standardized verbal stimulation to contract as fast and strong as possible after the command “go”, hold the contraction for 5 seconds, and relax after the command “stop”. Six attempts (three for the flexors and three for the extensors) will be performed in each limb with a 30-s interval between attempts . Two minutes after isometric evaluation, the volunteers will remain positioned for concentric isokinetic evaluation (five repetitions with 60°/s speed) of the knee flexor and extensor muscles [18, 19]. Volunteers should extend and flex the knee in a pre-established range of motion (90° to 10°). The RTD will be extracted from the isometric torque curve of evaluated muscles. RTD provides physiological information such as the role of neural and muscular factors in producing strength and neuromuscular fatigue [39, 40]. Analysis of the rate of force development will be conducted as previously proposed [38, 39].
Knee pain during exercise will be assessed at all sessions (immediately after each series) by the VAS. Volunteers will be questioned regarding anterior knee pain during the last five repetitions of each series and will be informed that this pain assessment has no relation to occlusion discomfort or perceived exertion . An average will be calculated to obtain the level of pain per session.
Perceived effort will be evaluated in all of the sessions through the modified 10-point Borg scale  immediately before starting the hack machine squatting and leg extension exercises (for baseline recording) and after the last thigh muscle–strengthening exercise. Adherence to treatment will be assessed by calculating the percentage of sessions completed by each volunteer .
The participants’ satisfaction with treatment will be inferred from the global perceived effect (GPE) scale and from the sensation of pleasure/displeasure during exercises. The GPE scale evaluates the clinical change perceived by the patient, comparing the onset of symptoms with the last days. This numerical scale consists of 11 points (from −5 to +5: −5, extremely worse; 0, without modification; +5, fully recovered). Higher scores indicate better recovery of the condition [42, 43]. The pleasure/displeasure related to the squatting exercise on the hack machine and leg extension will be evaluated by the Feeling Scale, a scale of 11 points, ranging from −5 (much displeasure) to +5 (much pleasure). The Feeling Scale will be applied once per session immediately after the last thigh muscle–strengthening exercise, immediately after perceived effort evaluation. The outcome measures will be conducted by the same evaluator throughout the study, and all equipment will be calibrated before starting the study.
Participants will be masked for the intervention they receive and will be instructed not to talk about their experience during the exercise if they incidentally encounter other participants. Furthermore, the study interventions and measurements will occur in separate locations and the treatment sessions will be individualized, thus facilitating the blinding of participants and evaluators. Participants from both groups will receive the TRP evaluation to induce the placebo effect and will be informed that BFR during exercise is effective in increasing muscle strength and reducing knee pain.
Sample size estimates
It is estimated that a sample size of 32 patients per group would be necessary to test our research hypothesis on the primary outcome (knee pain). The parameters utilized to sample size calculation included an intergroup variability (σ) in the VAS gain of 21% for both groups ; a non-inferiority limit (d) of 14%, which is less than the minimum clinically perceptible difference, usually considered to be 15% for the VAS ; a type-I error of 5% (α =0.05); a power of 80% (β=0.20) and a dropout rate of 15%.
The data distributions of normality will be evaluated by the Kolmogorov–Smirnov test. In the case of normal distribution, an analysis of covariance (ANCOVA test) with Tukey’s post hoc will be used to test the differences between groups. The between-group mean difference, 95% confidence interval, and effect size (Cohen’s f) will be reported. The Kruskal–Wallis test will be used for non-normal data distribution, and the effect size will be calculated with Cohen’s r. All participants will be included in the analysis following an intention-to-treat approach.
This trial will examine whether BFR resistance exercise with very low load and low volume will present effects similar to those of the HIRE on pain, muscular performance, physical function, disease severity, and quality of life in patients with knee OA. Although previous studies have shown positive effects of BRF exercises, the true efficacy of this intervention is hampered by the matching of the total exercise volume compared with HIRE . In addition, no study has evaluated the effects of BFR exercise with very low load (10% of 1-RM) and low volume in patients with knee OA. If effective, BFR exercise with 10% of 1-RM can be an interesting treatment for generating lower joint overload and consequently lesser pain during exercise.
The present study can be considered of high methodological quality because it is randomized and prospectively registered, masks the evaluators and patients, concealed allocation, and used an intention-to-treat approach. Sample size was calculated to provide adequate statistical power to identify possible differences in the study primary outcome. In addition, the 3-month follow-up will enable verification of the persistent effects of BFR exercise in patients with knee OA, thus filling this gap since studies on this topic generally assess the effects only immediately after treatment.
The exercise load will be periodically adjusted, thus maintaining the overload principle of strength training. We will estimate the 1-RM from a submaximal test (7–10 RM test) to minimize the pain interference in the load determination. In addition, to avoid a possible measurement bias (gain strength due to learning with the test and not due to neuromuscular adaptations) we choose to measure the strength in three different ways (isometric, isokinetic and 7-10 RM test). . Another strength of this trial is external validity. In order to enable extrapolation of the study findings to a larger portion of the population, it was decided not to limit the participation of patients according to gender, unilateral or bilateral involvement, and the use (or not) of medications. The randomization will be balanced and the statistical analysis will be adjusted according to these factors to minimize possible confounding factors due to this greater sample coverage.
This protocol is not free of limitations. First, the percentage of occluded blood flow will not be measured; instead, the percentage relative to the TRP will be calculated; therefore, it is not possible to guarantee the exact amount of BFR. Furthermore, the TRP will be measured at rest, and therefore it will not be possible to guarantee that the amount of restricted blood flow will be the same during exercise since the muscle hemodynamics may be altered because of the action of the muscular pump and release of vasoactive substances. Another limitation of the study is the impossibility of masking the therapist. In conclusion, the results of this trial may indicate the very-low load and low-volume BRF exercise as an effective treatment for knee OA, generating lower joint pain during exercise and increasing adherence and satisfaction with the treatment.
At the time of manuscript submission, the volunteers were being recruited.
1 maximal repetition
Blood flow restriction
Global perceived effect
High-intensity resistance exercise
Rate of torque development
Total restriction pressure
Visual analog scale
Fransen M, McConnell S, Harmer AR, Van der Esch M, Simic M, Bennell KL. Exercise for osteoarthritis of the knee. Cochrane Database Syst Rev. 2015;1:CD004376.
Cross M, Smith E, Hoy D, Nolte S, Ackerman I, Fransen M, et al. The global burden of hip and knee osteoarthritis: Estimates from the Global Burden of Disease 2010 study. Ann Rheum Dis. 2014;73:1323–30.
Nicolson PJA, Bennell KL, Dobson FL, Van Ginckel A, Holden MA, Hinman RS. Interventions to increase adherence to therapeutic exercise in older adults with low back pain and/or hip/knee osteoarthritis: a systematic review and meta-analysis. Br J Sports Med. 2017;51:791–9.
Øiestad BE, Juhl CB, Eitzen I, Thorlund JB. Knee extensor muscle weakness is a risk factor for development of knee osteoarthritis. A systematic review and meta-analysis. Osteoarthr Cartil. 2015;23:171–7.
McAlindon TE, Bannuru RR, Sullivan MC, Arden NK, Berenbaum F, Bierma-Zeinstra SM, et al. OARSI guidelines for the non-surgical management of knee osteoarthritis. Osteoarthr Cartil. 2014;22:363–88.
ACSM. American College of Sports Medicine position stand. Progression models in resistance training for healthy adults. Med Sci Sports Exerc. 2009;41:687–708.
Lixandrão ME, Ugrinowitsch C, Berton R, Vechin FC, Conceição MS, Damas F, et al. Magnitude of Muscle Strength and Mass Adaptations Between High-Load Resistance Training Versus Low-Load Resistance Training Associated with Blood-Flow Restriction: A Systematic Review and Meta-Analysis. Sports Med. 2018;48:361–78.
Jan M-H, Lin J-J, Liau J-J, Lin Y-F, Lin D-H. Investigation of Clinical Effects of High- and Low-Resistance Training for Patients With Knee Osteoarthritis: A Randomized Controlled Trial. Phys Ther. 2008;88:427–36.
Bennell KL, Dobson F, Hinman RS. Exercise in osteoarthritis: moving from prescription to adherence. Best Pract Res Clin Rheumatol. 2014;28:93–117.
Hughes L, Paton B, Rosenblatt B, Gissane C, Patterson SD. Blood flow restriction training in clinical musculoskeletal rehabilitation: a systematic review and meta-analysis. Br J Sports Med. 2017;51:1003–11.
Ferraz RB, Gualano B, Rodrigues R, Kurimori CO, Fuller R, Lima FR, et al. Benefits of Resistance Training with Blood Flow Restriction in Knee Osteoarthritis. Med Sci Sports Exerc. 2018;50:897–905.
Pearson SJ, Hussain SR. A Review on the Mechanisms of Blood-Flow Restriction Resistance Training-Induced Muscle Hypertrophy. Sports Med. 2014;45:187–200.
de Araújo AC, Junior AF, de Oliveira SK, Schamne JC, Okuno NM. Physiological and rating of perceived exertion responses to resistance training sessions with and without vascular occlusion. Isokin Exerc Sci. 2017;25:91–6.
Jessee M, Dankel S, Buckner S, Mouser J, Mattocks K, Loenneke J. The Cardiovascular and Perceptual Response to Very Low Load Blood Flow Restricted Exercise. Int J Sports Med. 2017;38:597–603.
Bryk FF, Dos Reis AC, Fingerhut D, Araujo T, Schutzer M, Cury Rde P, et al. Exercises with partial vascular occlusion in patients with knee osteoarthritis: a randomized clinical trial. Knee Surg Sports Traumatol Arthrosc. 2016;24:1580–6.
Hollander DB, Reeves GV, Clavier JD, Francois MR, Thomas C, Kraemer RR. Partial Occlusion During Resistance Exercise Alters Effort Sense and Pain. J Strength Cond Res. 2010;24:235–43.
Barcelos LC, Nunes PRP, de Souza LRMF, de Oliveira AA, Furlanetto R, Marocolo M, et al. Low-load resistance training promotes muscular adaptation regardless of vascular occlusion, load, or volume. Eur J Appl Physiol. 2015;115:1559–68.
Segal NA, Williams GN, Davis MC, Wallace RB, Mikesky AE. Efficacy of Blood Flow–Restricted, Low-Load Resistance Training in Women with Risk Factors for Symptomatic Knee Osteoarthritis. PM&R. 2015;7:376–84.
Segal N, Davis MD, Mikesky AE. Efficacy of Blood Flow-Restricted Low-Load Resistance Training For Quadriceps Strengthening in Men at Risk of Symptomatic Knee Osteoarthritis. Geriatr Orthop Surg Rehabil. 2015;6:160–7.
Giles L, Webster KE, McClelland J, Cook JL. Quadriceps strengthening with and without blood flow restriction in the treatment of patellofemoral pain: a double-blind randomised trial. Br J Sports Med. 2017;51:1688–94.
Chan A-W, Tetzlaff JM, Altman DG, Laupacis A, Gøtzsche PC, Krleža-Jerić K, et al. SPIRIT 2013 Statement: Defining Standard Protocol Items for Clinical Trials. Ann Intern Med. 2013;158:200.
Yamato T, Maher C, Saragiotto B, Moseley A, Hoffmann T, Elkins M, et al. The TIDieR checklist will benefit the physical therapy profession. Braz J Phys Ther. 2016;20:191–3.
da Silva FS, de Melo FES, do Amaral MMG, Caldas VVA, Pinheiro ÍLD, Abreu BJ, et al. Efficacy of simple integrated group rehabilitation program for patients with knee osteoarthritis: Single-blind randomized controlled trial. J Rehabil Res Dev. 2015;52:309–22.
Powers CM, Ho K-Y, Chen Y-J, Souza RB, Farrokhi S. Patellofemoral Joint Stress During Weight-Bearing and Non—Weight-Bearing Quadriceps Exercises. J Orthop Sports Phys Ther. 2014;44:320–7.
Brosseau L, Taki J, Desjardins B, Thevenot O, Fransen M, Wells GA, et al. The Ottawa panel clinical practice guidelines for the management of knee osteoarthritis. Part two: strengthening exercise programs. Clin Rehabil. 2017;31:596–611.
Astephen JL, Deluzio KJ, Caldwell GE, Dunbar MJ. Biomechanical changes at the hip, knee, and ankle joints during gait are associated with knee osteoarthritis severity. J Orthop Res. 2008;26:332–41.
Bartholdy C, Klokker L, Bandak E, Bliddal H, Henriksen M. A Standardized “Rescue” Exercise Program for Symptomatic Flare-up of Knee Osteoarthritis: Description and Safety Considerations. J Orthop Sports Phys Ther. 2016;46:942–6.
Nascimento LR, Teixeira-Salmela LF, Souza RB, Resende RA. Hip and Knee Strengthening is More Effective Than Knee Strengthening Alone for Reducing Pain and Improving Activity in Individuals With Patellofemoral Pain: A Systematic Review With Meta-Analysis. J Orthop Sports Phys Ther. 2018;48:19–31.
McNair PJ, Colvin M, Reid D. Predicting maximal strength of quadriceps from submaximal performance in individuals with knee joint osteoarthritis. Arthritis Care Res. 2011;63:216–22.
Cook SB, LaRoche DP, Villa MR, Barile H, Manini TM. Blood flow restricted resistance training in older adults at risk of mobility limitations. Exp Gerontol. 2017;99:138–45.
Lixandrão ME, Ugrinowitsch C, Laurentino G, Libardi CA, Aihara AY, Cardoso FN, et al. Effects of exercise intensity and occlusion pressure after 12 weeks of resistance training with blood-flow restriction. Eur J Appl Physiol. 2015;115:2471–80.
Jessee MB, Buckner SL, Dankel SJ, Counts BR, Abe T, Loenneke JP. The Influence of Cuff Width, Sex, and Race on Arterial Occlusion: Implications for Blood Flow Restriction Research. Sports Med. 2016;46:913–21.
Loenneke JP, C a F, Rossow LM, Sherk VD, Thiebaud RS, Abe T, et al. Effects of cuff width on arterial occlusion: implications for blood flow restricted exercise. Eur J Appl Physiol. 2012;112:2903–12.
Bezerra de Morais AT, Santos Cerqueira M, Moreira Sales R, Rocha T, Galvão de Moura Filho A. Upper limbs total occlusion pressure assessment: Doppler ultrasound reproducibility and determination of predictive variables. Clin Physiol Funct Imaging. 2017;37:437–41.
Dobson F, Hinman RS, Roos EM, Abbott JH, Stratford P, Davis AM, et al. OARSI recommended performance-based tests to assess physical function in people diagnosed with hip or knee osteoarthritis. Osteoarthr Cartil. 2013;21:1042–52.
Marx FC, De Oliveira LM, Bellini CG, Ribeiro MCC. Tradução e validação cultural do questionário algofuncional de Lequesne para osteoartrite de joelhos e quadris para a língua Portuguesa. Osteoarthr Cartil. 2013;21:1042–52.
Ciconelli R, Ferraz M, Santos W, Meinão I, Quaresma M. Tradução para língua portuguesa e validação do questionário genérico de avaliação de qualidade de vida SF-36 (Brasil SF-36). Rev Bras Reumat. 1999;39:143–50.
Schettino L, Luz CPN, De Oliveira LEG, De Assunção PL, Da Silva Coqueiro R, Fernandes MH, et al. Comparison of explosive force between young and elderly women: Evidence of an earlier decline from explosive force. Age. 2014;36:893–8.
Aagaard P, Simonsen EB, Andersen JL, Magnusson P, Dyhre-Poulsen P. Increased rate of force development and neural drive of human skeletal muscle following resistance training. J Appl Physiol. 2002;93:1318–26.
Maffiuletti NA, Aagaard P, Blazevich AJ, Folland JP, Tillin NA, Duchateau J. Rate of force development: physiological and methodological considerations. Eur J Appl Physiol. 2016;116:1–26.
Thomas SG, Pagura SMC, Kennedy D. Physical Activity and its Relationship to Physical Performance in Patients With End Stage Knee Osteoarthritis. J Orthop Sports Phys Ther. 2003;33:745–54.
de Fátima Costa Oliveira N, Oliveira Pena Costa L, Nelson R, Maher CG, Beattie PF, de Bie R, et al. Measurement Properties of the Brazilian Portuguese Version of the MedRisk Instrument for Measuring Patient Satisfaction With Physical Therapy Care. J Orthop Sports Phys Ther. 2014;44:879–89.
Costa LOP, Maher CG, Latimer J, Ferreira PH, Ferreira ML, Pozzi GC, et al. Clinimetric Testing of Three Self-report Outcome Measures for Low Back Pain Patients in Brazil. Spine. 2008;33:2459–63.
Kirchner M, Marshall D. A double-blind randomized controlled trial comparing alternate forms of high molecular weight hyaluronan for the treatment of osteoarthritis of the knee. Osteoarthritis Cartilage. 2006;14:154e62.
Escobar A, Quintana JM, Bilbao A, Arostegui I, Lafuente I, Vidaurreta I. Responsiveness and clinically important differences for the WOMAC and SF-36 after total knee replacement. Osteoarthritis Cartilage 2007;15:273–80.
Buckner SL, Jessee MB, Mattocks KT, Mouser JG, Counts BR, Dankel SJ, et al. Determining Strength: A Case for Multiple Methods of Measurement. Sports Med. 2017;47:193–5.
MSC would like to thank Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES), finance code 001, for the scholarship concession.
This trial was conducted with the authors’ own funding and no external sources.
Ethics approval and consent to participate
The Committee of Universidade Federal do Rio Grande do Norte approved this study (CAAE: 91753618.4.0000.5537). Informed consent will be obtained from all participants included in the study.
Consent for publication
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
SPIRIT (Standard Protocol Items: Recommendations for Interventional Trials) 2013 Checklist: Recommended items to address in a clinical trial protocol and related documents. (DOC 122 kb)
About this article
Cite this article
Cerqueira, M.S., Brito Vieira, W.H. Effects of blood flow restriction exercise with very low load and low volume in patients with knee osteoarthritis: protocol for a randomized trial. Trials 20, 135 (2019) doi:10.1186/s13063-019-3238-2
- Knee pain
- Vascular occlusion exercise
- Resistance training
- Muscle strength