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Safford DW, Shah KM, Breidenbach F, McClure PW. Effects of Low-Load Blood Flow Restriction Training on Rotator Cuff Strength and Hypertrophy: Case Series. Int J Sports Phys Ther 2024; 19:735-744. [PMID: 38835981 PMCID: PMC11144660 DOI: 10.26603/001c.118143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 04/30/2024] [Indexed: 06/06/2024] Open
Abstract
Background The rotator cuff (RC) plays a pivotal role in the performance and health of the shoulder and upper extremity. Blood flow restriction training (BFRT) is a modality to improve strength and muscle hypertrophy with even low-load training in healthy and injured individuals. There is minimal evidence examining its effect proximal to the occluded area, and particularly on the RC. Hypothesis & Purpose The purpose of this case series is to explore the effects of low-load BFRT on RC strength, hypertrophy, and tendon thickness in asymptomatic individuals. Study Design Case series. Methods Fourteen participants with asymptomatic, untrained shoulders were recruited to participate. They performed an eight-week low-load shoulder exercise regimen where BFR was applied to the dominant arm only during exercise. The dependent variables were maximal isometric strength of the shoulder external rotators(ER) and elevators (in the scapular plane in full can position) (FC) measured via handheld dynamometry, cross sectional area (CSA) of the supraspinatus and infraspinatus muscles, and supraspinatus tendon thickness measured via ultrasound imaging (US). Mean changes within and between arms were compared after training using paired t-tests. Cohen's d was used to determine effect sizes. Results All participants were able to complete the BFRT regimen without adverse effects. Mean strength and CSA increased for all variables in both arms, however this increase was only significant (p\<0.01) for FC strength bilaterally and CSA for the supraspinatus and infraspinatus on the BFRT side. The effect sizes for increased supraspinatus and infraspinatus CSA on the BFRT side were 0.40 (9.8% increase) and 0.46 (11.7% increase) respectively. There were no significant differences when comparing the mean changes of the BFRT side to the non-BFRT side for strength or muscle CSA. There were no significant changes to supraspinatus tendon thickness. Conclusion These results suggest variability in response of the RC musculature to low-load BFRT in asymptomatic individuals. The potential for a confounding systemic response in the study design makes determining whether low-load BFRT is more beneficial than low-load non-BFRT difficult. The hypertrophy seen on the BFRT side warrants further study. Level of Evidence 4.
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Kara D, Ozcakar L, Demirci S, Huri G, Duzgun I. Blood Flow Restriction Training in Patients With Rotator Cuff Tendinopathy: A Randomized, Assessor-Blinded, Controlled Trial. Clin J Sport Med 2024; 34:10-16. [PMID: 37706671 DOI: 10.1097/jsm.0000000000001191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 08/06/2023] [Indexed: 09/15/2023]
Abstract
OBJECTIVES To investigate the effects of low-load blood flow restriction (BFR) training on shoulder muscle thickness, rotator cuff (RC) strength, and shoulder symptoms in patients with RC tendinopathy. DESIGN A randomized, assessor-blinded, controlled trial. SETTINGS Physiotherapy clinic at a university. PARTICIPANTS Twenty-eight patients were randomized into an 8-week (2 times/week) shoulder rehabilitation, that is, BFR or non-BFR group. INTERVENTIONS BFR training. MAIN OUTCOME MEASURES (1) RC, deltoid, scapula retractor, and biceps muscle thicknesses and shoulder internal rotation (IR) and external rotation (ER) strengths. (2) Shoulder pain/function. RESULTS The BFR group had a greater increase in biceps muscle thickness ( P = 0.002) and shoulder IR strength at 60 degrees/s ( P = 0.040) than the non-BFR group. No differences between the 2 groups were observed in other measurements. Significant improvements in supraspinatus, infraspinatus, and scapula retractor muscle thicknesses and in shoulder ER and IR strengths were observed over time in both the groups (all P < 0 .05). Also, shoulder pain decreased and shoulder function increased over time in both the groups (all P < 0 .05). CONCLUSIONS Low-load BFR training resulted in a greater increase in biceps thickness and shoulder IR strength compared with the non-BFR group in patients with RC tendinopathy. However, there was no superiority of either exercise training regarding the RC, scapula retractor, deltoid muscle thicknesses, or improvements in shoulder ER strength and shoulder pain/function. CLINICAL TRIAL REGISTRY NAME AND REGISTRATION NUMBER The study was registered in ClinicalTrials.gov named Blood Flow Restriction Training in Patients with Shoulder Pain and the registration number is NCT04333784.
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Affiliation(s)
- Dilara Kara
- Department of Sports Physical Therapy, Faculty of Physical Therapy and Rehabilitation, Hacettepe University, Sihhiye, Ankara, Turkey
| | - Levent Ozcakar
- Department of Physical and Rehabilitation Medicine, School of Medicine, Hacettepe University, Sihhiye, Ankara, Turkey
| | - Serdar Demirci
- Department of Physical Therapy and Rehabilitation, Faculty of Health Sciences, Balıkesir University, Balikesir, Turkey; and
| | - Gazi Huri
- Department of Orthopedics and Traumatology, School of Medicine, Hacettepe University, Sihhiye, Ankara, Turkey
| | - Irem Duzgun
- Department of Sports Physical Therapy, Faculty of Physical Therapy and Rehabilitation, Hacettepe University, Sihhiye, Ankara, Turkey
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Yang M, Liang B, Zhao X, Wang Y, Xue M, Wang D. BFR Training Improves Patients' Reported Outcomes, Strength, and Range of Motion After Casting for Colles' Fracture. Med Sci Sports Exerc 2023; 55:1985-1994. [PMID: 37259253 DOI: 10.1249/mss.0000000000003228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
PURPOSE This study compared traditional rehabilitation as a treatment modality after plaster cast treatment of Colles' fracture with a combination of individualized blood flow restriction (BFR) and traditional rehabilitation. METHODS Twenty-eight participants were randomized into a BFR group and a non-BFR group after plaster cast treatment of Colles' fracture. The BFR group completed traditional rehabilitation with a medical grade tourniquet applied to the upper arm, and the non-BFR group underwent traditional rehabilitation only. Patients were followed up with radiographic outcomes (palmar tilt and radial inclination) to ensure the stability of the fracture. Clinical assessment of patient-rated wrist evaluation (PRWE) score, grip strength, pinch strength, wrist range of motion (ROM), and muscle stiffness was conducted at cast removal and 6 wk after cast removal. Two-way repeated-measures ANOVA determined significant interactions between time and group in the aforementioned variables. An independent-sample t -test assessed the differences in baseline variables and radiographic outcomes. RESULTS Significant interactions between time and group were noted for PRWE score ( F = 11.796, P = 0.002, η2p = 0.339), grip strength ( F = 5.445, P = 0.029, η2p = 0.191), and wrist ROM (ulnar deviation; F = 7.856, P = 0.010, η2p = 0.255). No significant interactions between time and group were found in measurements of pinch strength or wrist ROM (flexion, extension, radial deviation, pronation, supination). An independent-sample t -test showed no significant difference in baseline variables and radiographic outcomes between the groups before or after intervention. CONCLUSIONS This study found that combining individualized BFR with traditional rehabilitation resulted in greater increases in PRWE score, grip strength, and wrist ROM (ulnar deviation) than traditional rehabilitation alone. Therefore, adding individualized BFR to traditional rehabilitation might be a better option for treatment for similar patients.
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Affiliation(s)
- Mingming Yang
- School of Elite Sport, Shanghai University of Sport, Shanghai, CHINA
| | - Bin Liang
- Department of Orthopaedics, Nanjing First Hospital, Nanjing, CHINA
| | - Xin Zhao
- Department of Orthopaedics, Nanjing First Hospital, Nanjing, CHINA
| | - Yang Wang
- Department of Orthopaedics, Nanjing First Hospital, Nanjing, CHINA
| | | | - Dan Wang
- School of Elite Sport, Shanghai University of Sport, Shanghai, CHINA
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Pavlou K, Savva C, Korakakis V, Pamboris GM, Karagiannis C, Ploutarchou G, Constantinou A. Blood Flow Restriction Training in Nonspecific Shoulder Pain: Study Protocol of a Crossover Randomised Controlled Trial. Sports (Basel) 2023; 11:197. [PMID: 37888524 PMCID: PMC10610701 DOI: 10.3390/sports11100197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 10/03/2023] [Accepted: 10/07/2023] [Indexed: 10/28/2023] Open
Abstract
"Nonspecific shoulder pain" encompasses various non-traumatic musculoskeletal shoulder disorders, diverging from diagnostic terminologies that refer to precise tissue-oriented clinical diagnosis. Blood flow restriction (BFR) training, involving partial arterial inflow and complete venous outflow restriction, has exhibited acute hypoalgesic effects primarily in healthy populations by increasing their pain thresholds. This study aims to examine whether a single BFR session with low-load exercises can alleviate pain perception among nonspecific shoulder pain patients. Conducted as a single-blind crossover randomised clinical trial, 48 adults (age range: 18 to 40) presenting with nonspecific shoulder pain will partake in two trial sessions. Random assignment will place participants into BFR or sham BFR groups and ask them to perform one exercise with BFR. Subsequently, participants will complete a shoulder girdle loading regimen comprising six exercises. The second session will involve participants switching treatment groups. Pain pressure thresholds (PPTs), shoulder pain and disability via the shoulder pain and disability index (SPADI), maximal voluntary isometric contraction (MVIC) of shoulder external rotators, pain during active abduction, and peak pain during shoulder external rotation will be evaluated using the numeric pain rating scale (NPRS). Immediate post-exercise assessments will include patient-perceived pain changes using the global rating of change scale (GROC) and participant-rated perceived exertion (RPE), employing a modified Borg's scale (Borg CR10) post-BFR or sham BFR exercise session. Each session will encompass three assessment periods, and a combination of mixed-effect models and descriptive statistics will underpin the analysis. This protocol was approved by Cyprus National Bioethics Committee (ΕΕΒΚ/2023/48), and was registered in ClinicalTrials.gov (Registration number: NCT05956288). Conclusion: The anticipated outcomes of this study illuminated the acute effects of BFR training on pain perception within the context of nonspecific shoulder pain, potentially advancing strategies for managing pain intensity using BFR techniques.
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Affiliation(s)
- Kyriakos Pavlou
- Department of Health Sciences, European University Cyprus, 1516 Nicosia, Cyprus; (G.M.P.); (C.K.); (G.P.); (A.C.)
| | - Christos Savva
- Department of Health Sciences, Frederick University, 3080 Limassol, Cyprus;
| | | | - George M. Pamboris
- Department of Health Sciences, European University Cyprus, 1516 Nicosia, Cyprus; (G.M.P.); (C.K.); (G.P.); (A.C.)
| | - Christos Karagiannis
- Department of Health Sciences, European University Cyprus, 1516 Nicosia, Cyprus; (G.M.P.); (C.K.); (G.P.); (A.C.)
| | - George Ploutarchou
- Department of Health Sciences, European University Cyprus, 1516 Nicosia, Cyprus; (G.M.P.); (C.K.); (G.P.); (A.C.)
| | - Antonis Constantinou
- Department of Health Sciences, European University Cyprus, 1516 Nicosia, Cyprus; (G.M.P.); (C.K.); (G.P.); (A.C.)
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Montoye AHK, Neph SE, Plouffe AA, Vondrasek JD, Nordbeck JT, Cox BA, Vranish JR. Understanding lower limb blood flow occlusion parameters for use in field-based settings. J Sports Sci 2023; 41:850-858. [PMID: 37493083 DOI: 10.1080/02640414.2023.2240995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 07/18/2023] [Indexed: 07/27/2023]
Abstract
Reduction of blood flow to the limb using cuffs before or during exercise has become increasingly popular for training and rehabilitation. Our study tested the effects of cuff brand/width on pressures required to reach limb occlusion pressure (LOP) and developed, cross-validated, and compared accuracy of two LOP prediction equations to previously created methods. Supine LOP was determined in the distal popliteal artery using four different cuff brands/widths in 23 adult participants. Participants then had demographic and resting variables assessed, and two LOP prediction equations were developed from these variables and were compared to five previously developed models and a method using posterior tibial artery palpation for LOP assessment in an independent sample (n = 14 adult runners). For cuff comparison, the widest two cuffs had significantly lower LOP (mean ~149 mmHg) than the narrowest cuffs (mean ~176 mmHg), with the narrowest cuff unable to reach LOP. The eight methods used to predict LOP ranged in accuracy (mean absolute percent errors 3.9-23.0%), with highest accuracy in equations using mean arterial pressure (MAP) and BMI. Practitioners using blood flow reduction methods should be consistent with cuff use due to demonstrated differences across brands/widths. Equations using MAP and BMI appear best for prediction of leg LOP.
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Affiliation(s)
- Alexander H K Montoye
- Department of Integrative Physiology and Health Science, Alma College, Alma, MI, United States of America
| | - Sylvia E Neph
- Department of Integrative Physiology and Health Science, Alma College, Alma, MI, United States of America
| | - Audrey A Plouffe
- Department of Integrative Physiology and Health Science, Alma College, Alma, MI, United States of America
| | - Joseph D Vondrasek
- Department of Integrative Physiology and Health Science, Alma College, Alma, MI, United States of America
- Department of Health Sciences and Kinesiology, Georgia Southern University Armstrong Campus, Savannah, GA, United States of America
| | - Jackson T Nordbeck
- Department of Integrative Physiology and Health Science, Alma College, Alma, MI, United States of America
| | - Benjamin A Cox
- Cox Sports Medicine and Orthopedic Surgery, Mt. Pleasant, MI, United States of America
| | - Jennifer R Vranish
- Department of Integrative Physiology and Health Science, Alma College, Alma, MI, United States of America
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Roehl T, Lambert BS, Ankersen J, Hernandez K, McCulloch PC, Hedt C. Optimal Blood Flow Restriction Occlusion Pressure for Shoulder Muscle Recruitment With Upper Extremity Exercise. Am J Sports Med 2023:3635465231166959. [PMID: 37092707 DOI: 10.1177/03635465231166959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
BACKGROUND As blood flow restriction (BFR) utilization continues to rise, it is crucial to define optimal parameters for use. Currently unknown are the effects of occlusion level during BFR on muscle activity in the proximal shoulder. PURPOSE/HYPOTHESIS The purpose of this study was to compare electromyographic amplitude (EMGa) of shoulder musculature during exercise using limb occlusion percentages (LOPs). The authors hypothesized that EMGa would increase concurrently with occlusion. STUDY DESIGN Controlled laboratory study. METHODS α Fifteen healthy adults were recruited and underwent 4 experimental sessions, performing 3 common rotator cuff exercises at low intensity (20% maximal strength) to failure in the following order: cable external rotation (ER), cable internal rotation (IR), and dumbbell scaption. Exercises were completed at a different occlusion pressure (0%, 25%, 50%, and 75% LOP- order randomized) applied at the proximal arm. EMGa was recorded from shoulder musculature proximal to the occlusion site and averaged across 5-repetition intervals and overall for the first 30 repetitions. An analysis of variance repeated on occlusion pressure followed by a Bonferroni post hoc test was used to compare EMGa, repetitions to fatigue, and ratings of discomfort (visual analog scale [VAS], 0-10) between occlusion pressures. The type 1 error was set at α = .05 for all analyses. RESULTS Significant effects of the occlusion level on shoulder muscle EMGa were observed for all exercises (P < .05) with diminishing returns above 50% LOP (overall). For ER, elevations in EMGa were observed at ≥50% LOP for the anterior deltoid, middle deltoid, infraspinatus, and trapezius compared with 0% LOP (P < .05). For IR, elevations in EMGa were observed at ≥25% LOP for the anterior deltoid and trapezius compared with 0% LOP (P < .05). For the teres minor, a significant elevation in EMGa occurred at 75% LOP compared with 0%, 25%, and 50% LOP (P < .05). A decrease in EMGa was observed at ≥50% LOP compared with 0% LOP for the posterior deltoid (P < .05). For scaption, an increase in EMGa was observed at ≥25% LOP for the infraspinatus and teres minor muscles, at 75% LOP for the posterior deltoid, and at ≥50% LOP for the trapezius compared with 0% LOP (P < .05). Decreases in repetitions to failure relative to 0% LOP were observed at 75% LOP for ER (0%: 47 ± 5; 75%: 40 ± 2; P = .034), IR (0%: 82 ± 10; 75%: 64 ± 5; P = .017), and scaption (0%: 85 ± 9; 75%: 64 ± 6; P < .001). A significant linear increase in discomfort was observed for all exercises with increasing occlusion pressures (VAS: 0-10, 0% → 75% LOP; ER: 2.2 ± 0.4 → 7.2 ± 0.3; IR: 1.3 ± 0.2 → 6.1 ± 0.6; scaption: 1.3 ± 0.4 → 6.1 ± 0.4; P < .01). CONCLUSION There are several differences in muscle activation about the shoulder based on exercise and occlusion when utilizing BFR. Increasing the percentage of limb occlusion leads to heightened EMGa with diminished returns past 50% LOP when considering muscle activation, discomfort, and achievable exercise volume. CLINICAL RELEVANCE These findings may be used to refine upper extremity BFR guidelines.
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Affiliation(s)
- Tyler Roehl
- Houston Methodist, Department of Orthopedics & Sports Medicine, Houston, Texas, USA
| | - Bradley S Lambert
- Houston Methodist, Department of Orthopedics & Sports Medicine, Houston, Texas, USA
| | - Jordan Ankersen
- Houston Methodist, Department of Orthopedics & Sports Medicine, Houston, Texas, USA
| | - Karen Hernandez
- Houston Methodist, Department of Orthopedics & Sports Medicine, Houston, Texas, USA
| | - Patrick C McCulloch
- Houston Methodist, Department of Orthopedics & Sports Medicine, Houston, Texas, USA
| | - Corbin Hedt
- Houston Methodist, Department of Orthopedics & Sports Medicine, Houston, Texas, USA
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Hinz M, Franz A, Pirker C, Traimer S, Lappen S, Doucas A, Siebenlist S. [Blood flow restriction training as a treatment option for lateral elbow tendinopathy-a study presentation]. ORTHOPADIE (HEIDELBERG, GERMANY) 2023; 52:365-370. [PMID: 37079041 DOI: 10.1007/s00132-023-04370-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Accepted: 03/13/2023] [Indexed: 04/21/2023]
Abstract
Blood flow restriction training, developed in 1966 in Japan, is a training modality that utilizes partial arterial and complete venous blood flow occlusion. Combined with low load resistance training, it aims to induce hypertrophy and strength gains. This makes it particularly suitable for people recovering from injury or surgery, for whom the use of high training loads is unfeasible. In this article, the mechanism behind blood flow restriction training and its applicability for the treatment of lateral elbow tendinopathy is explained. An ongoing prospective, randomized, controlled trial on the treatment of lateral elbow tendinopathy is presented.
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Affiliation(s)
- Maximilian Hinz
- Sektion Sportorthopädie, Technische Universität München, München, Deutschland.
| | - Alexander Franz
- Klinik und Poliklinik für Orthopädie und Unfallchirurgie, Universitätsklinikum Bonn, Bonn, Deutschland
| | - Christina Pirker
- Physiotherapie, Sektion Sportorthopädie, Technische Universität München, München, Deutschland
| | - Sophie Traimer
- Physiotherapie, Sektion Sportorthopädie, Technische Universität München, München, Deutschland
| | - Sebastian Lappen
- Sektion Sportorthopädie, Technische Universität München, München, Deutschland
| | - Alexandros Doucas
- Sektion Sportorthopädie, Technische Universität München, München, Deutschland
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Lau CW, Leung SY, Wah SH, Yip CW, Wong WY, Chan KS. Effect on muscle strength after blood flow restriction resistance exercise in early in-patient rehabilitation of post-chronic obstructive pulmonary disease acute exacerbation, a single blinded, randomized controlled study. Chron Respir Dis 2023; 20:14799731231211845. [PMID: 37976375 PMCID: PMC10657539 DOI: 10.1177/14799731231211845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Accepted: 10/03/2023] [Indexed: 11/19/2023] Open
Abstract
BACKGROUND Early commencement of rehabilitation might counteract the loss of muscle strength due to a chronic obstructive pulmonary disease acute exacerbation (COPDAE). Blood flow restriction resistance exercise (BFR-RE) using a low intensity of training load has demonstrated muscle strength gain in varieties of clinical populations. This trial aimed at studying the efficacy and acceptability of BFR-RE in patients with post-COPDAE which was not reported before. METHOD A prospective, assessor blinded, randomized controlled study with 2-week in-patient rehabilitation program with BFR-RE was compared to a matched program with resistance exercise without BFR in patients with post-COPDAE. The primary outcome was the change of muscle strength of knee extensor of dominant leg. The secondary outcomes included changes of hand grip strength (HGS), 6-minute walk test (6MWT) distance, short physical performance battery (SPPB) scores, COPD assessment test (CAT) scores; acceptability and feasibility of BFR-RE; and 1-month unplanned re-admission rate. RESULTS Forty-Five post-COPDAE patients (mean age = 76 ± 10, mean FEV1%=49% ± 24%) were analyzed. After training, BFR-RE group and control group demonstrated a statistically significant median muscle strength gain of 20 (Interquartile range (IQR) 3 to 38) Newton(N) and 12 (IQR -9 to 30) N respectively. BFR-RE group showed a significant change in SPPB scores, but not in 6MWT distance and HGS after training. Between groups did not have statistically significant different in all primary and secondary outcomes, though with similar acceptability. Drop-out rate due to training-related discomfort in BFR-RE group was 3.7%. CONCLUSION BFR-RE is feasible and acceptable in patients with post-COPDAE. A 2-week inpatient pulmonary rehabilitation with BFR-RE improved muscle strength of knee extensors, but not a greater extent than the same rehabilitation program with resistance exercise without BFR. Further studies could be considered with a longer training duration and progression of resistance load. [ClinicalTrials.gov Identifier: NCT04448236].
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Affiliation(s)
- Chung Wai Lau
- Department of Medicine, Haven of Hope Hospital, Kowloon, Hong Kong
| | - Siu Yin Leung
- Department of Physiotherapy, Haven of Hope Hospital, Kowloon, Hong Kong
| | - Shu Hong Wah
- Department of Medicine, Haven of Hope Hospital, Kowloon, Hong Kong
| | - Choi Wan Yip
- Department of Medicine, Haven of Hope Hospital, Kowloon, Hong Kong
| | - Wei Yin Wong
- Department of Medicine, Haven of Hope Hospital, Kowloon, Hong Kong
| | - Kin Sang Chan
- Department of Medicine, Haven of Hope Hospital, Kowloon, Hong Kong
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Pavlou K, Korakakis V, Whiteley R, Karagiannis C, Ploutarchou G, Savva C. The effects of upper body blood flow restriction training on muscles located proximal to the applied occlusive pressure: A systematic review with meta-analysis. PLoS One 2023; 18:e0283309. [PMID: 36952451 PMCID: PMC10035935 DOI: 10.1371/journal.pone.0283309] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 03/07/2023] [Indexed: 03/25/2023] Open
Abstract
BACKGROUND Blood flow restriction combined with low load resistance training (LL-BFRT) is associated with increases in upper limb muscle strength and size. The effect of LL-BFRT on upper limb muscles located proximal to the BFR cuff application is unclear. OBJECTIVE The aim of this systematic review was to evaluate the effect of LL-BFRT compared to low load, or high load resistance training (LL-RT, HL-RT) on musculature located proximal to cuff placement. METHODS Six electronic databases were searched for randomized controlled trials (RCTs). Two reviewers independently evaluated the risk of bias using the PEDro scale. We performed a meta-analysis using a random effects model, or calculated mean differences (fixed-effect) where appropriate. We judged the certainty of evidence using the GRADE approach. RESULTS The systematic literature searched yielded 346 articles, of which 9 studies were eligible. The evidence for all outcomes was of very low to low certainty. Across all comparisons, a significant increase in bench press and shoulder flexion strength was found in favor of LL-BFRT compared to LL-RT, and in shoulder lean mass and pectoralis major thickness in favor of the LL-BFRT compared to LL-RT and HL-RT, respectively. No significant differences were found between LL-BFRT and HL-RT in muscle strength. CONCLUSION With low certainty LL-BFRT appears to be equally effective to HL-RT for improving muscle strength in upper body muscles located proximal to the BFR stimulus in healthy adults. Furthermore, LL-BFRT may induce muscle size increase, but these adaptations are not superior to LL-RT or HL-RT.
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Affiliation(s)
- Kyriakos Pavlou
- Department of Health Science, European University Cyprus, Engomi, Nicosia, Cyprus
| | - Vasileios Korakakis
- Department of Population Health Sciences, School of Life Course & Population Sciences, Faculty of Life Sciences and Medicine, King's College London, London, United Kingdom
| | - Rod Whiteley
- Aspetar, Orthopaedic and Sport Medicine Hospital, Doha, Qatar
| | - Christos Karagiannis
- Department of Health Science, European University Cyprus, Engomi, Nicosia, Cyprus
| | - George Ploutarchou
- Department of Health Science, European University Cyprus, Engomi, Nicosia, Cyprus
| | - Christos Savva
- Department of Health Science, European University Cyprus, Engomi, Nicosia, Cyprus
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Chen Y, Wang J, Li S, Li Y. Acute effects of low load resistance training with blood flow restriction on serum growth hormone, insulin-like growth factor-1, and testosterone in patients with mild to moderate unilateral knee osteoarthritis. Heliyon 2022; 8:e11051. [PMID: 36281415 PMCID: PMC9586906 DOI: 10.1016/j.heliyon.2022.e11051] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 09/05/2022] [Accepted: 10/07/2022] [Indexed: 11/06/2022] Open
Abstract
Objective To investigate the acute effects of blood flow restriction (BFR) with single-leg low load resistance exercise and high load resistance exercise on serum insulin-like growth factor-1 (IGF-1), growth hormone (GH), and testosterone in patients with unilateral knee osteoarthritis (OA). Methods This study recruited 18 postmenopausal female patients with mild to moderate unilateral knee OA, which was then followed by randomly conducting three resistance exercise protocols by drawing lots: 1. A 30% 1-repetition maximum (1-RM) resistance exercise with BFR of 70% arterial occlusive pressure (AOP) (BFR group); 2. A 70% 1-RM resistance exercise without BFR (RES group); 3. A 30% 1-RM resistance exercise without BFR (CON group). Blood lactate (BLA) and muscle growth related hormone levels were tested at 4-time points: before exercise, immediately after exercise, 15 min after exercise, and 30 min after exercise. Results There was no statistical difference between the indexes in each group before exercise, but the different exercise had different effects on each index and also an interactive effect (P < 0.05). The increase of rating of perceived exertion in the BFR and RES groups, which were of similar magnitude, was greater compared to the levels in the CON group (P < 0.05). Post-exercise BLA levels were lower in the CON group in comparison to the BFR and RES groups (P < 0.05). Rather than the RES group, GH levels of the BFR group were also significantly higher than the CON group (P < 0.05) at 15 min post-exercise. At post- and 15 min after exercise, the CON group recorded significantly lower IGF-1 levels compared to the BFR and RES groups (P < 0.05). At post- and 15 min after exercise, the CON group (P < 0.05) reflected the lowest testosterone levels, followed by the RES group (P < 0.05), and the highest in the BFR group (P < 0.05). Conclusions Myogenesis-related hormones in women with unilateral knee OA could be increased by high load resistance exercise and low load resistance exercise with BFR on unaffected limb.
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Affiliation(s)
- Yangguang Chen
- College of Physical Education, Zhengzhou Shengda University, Zhengzhou, Henan, China
| | - Junguo Wang
- Center for Osteoarticular and Trauma Surgery, Qingdao Hospital of Traditional Chinese Medicine (Qingdao Hiser Hospital), Qingdao, Shandong, China
| | - Shuoqi Li
- College of Physical Education, Yangzhou University, Yangzhou, Zhejiang, China,Corresponding author.
| | - Yinghao Li
- College of Physical Education, Zhengzhou Shengda University, Zhengzhou, Henan, China,Corresponding author.
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McGinniss JH, Mason JS, Morris JB, Pitt W, Miller EM, Crowell MS. The Effect of Blood Flow Restriction Therapy on Shoulder Function Following Shoulder Stabilization Surgery: A Case Series. Int J Sports Phys Ther 2022; 17:1144-1155. [PMID: 36873568 PMCID: PMC9981204 DOI: 10.26603/001c.37865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 06/10/2022] [Indexed: 11/12/2022] Open
Abstract
Background Traumatic shoulder instability is a common injury in athletes and military personnel. Surgical stabilization reduces recurrence, but athletes often return to sport before recovering upper extremity rotational strength and sport-specific abilities. Blood flow restriction (BFR) may stimulate muscle growth without the need for heavy resistance training post-surgically. Hypothesis/Purpose To observe changes in shoulder strength, self-reported function, upper extremity performance, and range of motion (ROM) in military cadets recovering from shoulder stabilization surgery who completed a standard rehabilitation program with six weeks of BFR training. Study Design Prospective case series. Methods Military cadets who underwent shoulder stabilization surgery completed six weeks of upper extremity BFR training, beginning post-op week six. Primary outcomes were shoulder isometric strength and patient-reported function assessed at 6-weeks, 12-weeks, and 6-months postoperatively. Secondary outcomes included shoulder ROM assessed at each timepoint and the Closed Kinetic Chain Upper Extremity Stability Test (CKCUEST), the Upper Extremity Y-Balance Test (UQYBT), and the Unilateral Seated Shotput Test (USPT) assessed at the six-month follow-up. Results Twenty cadets performed an average 10.9 BFR training sessions over six weeks. Statistically significant and clinically meaningful increases in surgical extremity external rotation strength (p < 0.001; mean difference, .049; 95% CI: .021, .077), abduction strength (p < 0.001; mean difference, .079; 95% CI: .050, .108), and internal rotation strength (p < 0.001; mean difference, .060; CI: .028, .093) occurred from six to 12 weeks postoperatively. Statistically significant and clinically meaningful improvements were reported on the Single Assessment Numeric Evaluation (p < 0.001; mean difference, 17.7; CI: 9.4, 25.9) and Shoulder Pain and Disability Index (p < 0.001; mean difference, -31.1; CI: -44.2, -18.0) from six to 12 weeks postoperatively. Additionally, over 70 percent of participants met reference values on two to three performance tests at 6-months. Conclusion While the degree of improvement attributable to the addition of BFR is unknown, the clinically meaningful improvements in shoulder strength, self-reported function, and upper extremity performance warrant further exploration of BFR during upper extremity rehabilitation. Level of Evidence 4, Case Series.
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Affiliation(s)
- John H McGinniss
- Baylor University - Keller Army Community Hospital Division I Sports Physical Therapy Fellowship
| | - John S Mason
- Baylor University - Keller Army Community Hospital Division I Sports Physical Therapy Fellowship
| | - Jamie B Morris
- Baylor University - Keller Army Community Hospital Division I Sports Physical Therapy Fellowship
| | - Will Pitt
- Baylor University - Keller Army Community Hospital Division I Sports Physical Therapy Fellowship
| | - Erin M Miller
- Baylor University - Keller Army Community Hospital Division I Sports Physical Therapy Fellowship
| | - Michael S Crowell
- Baylor University - Keller Army Community Hospital Division I Sports Physical Therapy Fellowship
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Abbas MJ, Dancy ME, Marigi EM, Khalil LS, Jildeh TR, Buckley PJ, Gillett J, Burgos W, Okoroha KR. An Automated Technique for the Measurement of Limb Occlusion Pressure During Blood Flow Restriction Therapy Is Equivalent to Previous Gold Standard. Arthrosc Sports Med Rehabil 2022; 4:e1127-e1132. [PMID: 35747637 PMCID: PMC9210466 DOI: 10.1016/j.asmr.2022.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 04/04/2022] [Indexed: 10/31/2022] Open
Abstract
Purpose Methods Results Conclusions Level of Evidence
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13
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Anderson KD, Rask DMG, Bates TJ, Nuelle JAV. Overall Safety and Risks Associated with Blood Flow Restriction Therapy: A Literature Review. Mil Med 2022; 187:1059-1064. [PMID: 35284924 DOI: 10.1093/milmed/usac055] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/28/2022] [Accepted: 02/22/2022] [Indexed: 11/12/2022] Open
Abstract
INTRODUCTION Blood flow restriction therapy (BFRT) is used in scenarios ranging from muscle building in athletic performance to decreasing recovery time in postoperative orthopedic rehabilitation. The efficacy of BFRT for treating diseases has been increasingly researched; however, there has been less literature focused on establishing the safety of this therapy. MATERIALS AND METHODS An extensive literature review pertaining to BFRT and any deleterious events related to its usage was completed by searching multiple databases, including PubMed, EMBASE, and Cochrane Library using the terms "blood flow restriction therapy" or "KAATSU." RESULTS Ten case reports, five case series, two national surveys, two questionnaires, six randomized controlled studies, and one systematic review were included. A total of 1,672 individuals reported an adverse event following BFRT use out of 25,813 individuals. Commonly reported adverse events were numbness, dizziness, subcutaneous hemorrhage, and rhabdomyolysis. There were unique adverse effects of this therapy reported in individuals with comorbid conditions, such as hypertension and thoracic outlet syndrome, which included isolated cases of central retinal vein occlusion and Paget-Schroeder syndrome. CONCLUSION Blood flow restriction provides tremendous opportunity with a potential for accelerated exercise rehabilitation and injury prevention. This modality could be used in the military setting to help injured active duty personnel expeditiously return to deployable status. Further prospective randomized controlled trials are warranted to further support BFRT safety; however, from this literature review, it can be concluded that BFRT can be utilized safely in the proper patient population when administered by qualified professionals who have undergone the appropriate training.
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Affiliation(s)
- Kevin D Anderson
- Department of General Surgery, Brooke Army Medical Center, Fort Sam Houston, TX 78234, USA
| | - Dawn M G Rask
- Department of Orthopaedic Surgery, Brooke Army Medical Center, Fort Sam Houston, TX 78234, USA
| | - Taylor J Bates
- Department of Orthopaedic Surgery, Brooke Army Medical Center, Fort Sam Houston, TX 78234, USA
| | - Julia A V Nuelle
- Department of Orthopaedic Surgery, Missouri Orthopaedic Institute, Columbia, MO 65212, USA
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Hedt C, McCulloch PC, Harris JD, Lambert BS. Blood Flow Restriction Enhances Rehabilitation and Return to Sport: The Paradox of Proximal Performance. Arthrosc Sports Med Rehabil 2022; 4:e51-e63. [PMID: 35141536 PMCID: PMC8811501 DOI: 10.1016/j.asmr.2021.09.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 09/15/2021] [Indexed: 12/17/2022] Open
Abstract
The use of blood flow restriction (BFR) within rehabilitation is rapidly increasing as further research is performed elucidating purported benefits such as improved muscular strength and size, neuromuscular control, decreased pain, and increased bone mineral density. Interestingly, these benefits are not isolated to structures distal to the occlusive stimulus. Proximal gains are of high interest to rehabilitation professionals, especially those working with patients who are limited due to pain or postsurgical precautions. The review to follow will focus on current evidence and ongoing hypotheses regarding physiologic responses to BFR, current clinical applications, proximal responses to BFR training, potential practical applications for rehabilitation and injury prevention, and directions for future research. Interestingly, benefits have been found in musculature proximal to the occlusive stimulus, which may lend promise to a greater variety of patient populations and conditions. Furthermore, an increasing demand for BFR use in the sports world warrants further research for performance research and recovery. LEVEL OF EVIDENCE Level V, expert opinion.
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Affiliation(s)
- Corbin Hedt
- Address correspondence to Corbin Hedt, P.T., D.P.T., S.C.S., C.S.C.S., Houston Methodist Orthopedics & Sports Medicine, 5505 West Loop South, Houston, TX 77081.
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Hughes L, Hackney KJ, Patterson SD. Optimization of Exercise Countermeasures to Spaceflight Using Blood Flow Restriction. Aerosp Med Hum Perform 2022; 93:32-45. [PMID: 35063054 DOI: 10.3357/amhp.5855.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION: During spaceflight missions, astronauts work in an extreme environment with several hazards to physical health and performance. Exposure to microgravity results in remarkable deconditioning of several physiological systems, leading to impaired physical condition and human performance, posing a major risk to overall mission success and crew safety. Physical exercise is the cornerstone of strategies to mitigate physical deconditioning during spaceflight. Decades of research have enabled development of more optimal exercise strategies and equipment onboard the International Space Station. However, the effects of microgravity cannot be completely ameliorated with current exercise countermeasures. Moreover, future spaceflight missions deeper into space require a new generation of spacecraft, which will place yet more constraints on the use of exercise by limiting the amount, size, and weight of exercise equipment and the time available for exercise. Space agencies are exploring ways to optimize exercise countermeasures for spaceflight, specifically exercise strategies that are more efficient, require less equipment, and are less time-consuming. Blood flow restriction exercise is a low intensity exercise strategy that requires minimal equipment and can elicit positive training benefits across multiple physiological systems. This method of exercise training has potential as a strategy to optimize exercise countermeasures during spaceflight and reconditioning in terrestrial and partial gravity environments. The possible applications of blood flow restriction exercise during spaceflight are discussed herein.Hughes L, Hackney KJ, Patterson SD. Optimization of exercise countermeasures to spaceflight using blood flow restriction. Aerosp Med Hum Perform. 2021; 93(1):32-45.
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Blood Flow Restriction Therapy and Its Use for Rehabilitation and Return to Sport: Physiology, Application, and Guidelines for Implementation. Arthrosc Sports Med Rehabil 2022; 4:e71-e76. [PMID: 35141538 PMCID: PMC8811521 DOI: 10.1016/j.asmr.2021.09.025] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 09/22/2021] [Indexed: 12/26/2022] Open
Abstract
Blood flow restriction (BFR) is an expanding rehabilitation modality that uses a tourniquet to reduce arterial inflow and occlude venous outflow in the setting of resistance training or exercise. Initially, this technique was seen as a way to stimulate muscular development, but improved understanding of its physiologic benefits and mechanism of action has allowed for innovative clinical applications. BFR represents a way to decrease stress placed on the joints without compromising improvements in strength, whereas for postoperative, injured, or load-compromised individuals BFR represents a way to accelerate recovery and prevent atrophy. There is also growing evidence to suggest that it augments cardiovascular fitness and attenuates pain. The purpose of this review is to highlight the physiology and evidence behind the various applications of BFR, with a focus on postoperative rehabilitation. While much remains to be learned, it is clear that blood flow restriction therapy stimulates muscle hypertrophy via a synergistic response to metabolic stress and mechanical tension, with supplemental benefits on cardiovascular fitness and pain. New forms of BFR and expanding applications in postoperative patients and athletes hold promise for expedited recovery. Continued adherence to rehabilitation guidelines and exploration of BFRs physiology and various applications will help optimize its effect and prescription. Level of Evidence V, expert opinion.
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Rotator cuff strength is not augmented by blood flow restriction training. Phys Ther Sport 2021; 52:305-311. [PMID: 34742029 DOI: 10.1016/j.ptsp.2021.10.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 10/20/2021] [Accepted: 10/22/2021] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Blood flow restriction (BFR) training utilizes a tourniquet applied to the upper or lower extremities (UE or LE) to occlude blood flow while exercising. BFR training may help augment strength in muscles that are proximal to BFR cuff application. However, prior studies have failed to demonstrate augmented strength gains in the rotator cuff when the tourniquet is applied to the UE. The purpose of this study was to evaluate if a protocol consisting of LE exercises, performed with BFR, followed by rotator cuff exercises was superior in augmenting strength, and cross-sectional area (CSA) of the rectus femoris, in untrained subjects when compared to a non-BFR training group. DESIGN Randomized controlled trial. SETTING University. PARTICIPANTS Thirty-five subjects (mean age 25.8 ± 1.6 y) randomized to a BFR or non-BFR group. MAIN OUTCOME MEASURES Muscular strength measured via hand held dynamometer and the CSA of the dominant rectus femoris was measured by diagnostic ultrasound. RESULTS Both groups experienced significant gains in LE and rotator cuff strength. Strength increased in the BFR group by 11.6% for the supraspinatus, 34.1% for shoulder ER, 23.4% for the quadriceps, and 17.1% for the hamstrings. Strength increased in the non-BFR group by 7.3% for the supraspinatus, 20% for shoulder ER, 12.8% for the quadriceps, and 10.7% for the hamstrings. However, there were no differences in strength gains between groups. Neither group experienced a significant increase in CSA for the rectus femoris. CONCLUSION The BFR protocol used in this study did not augment strength for the rotator cuff in subjects who also performed LE exercises under occlusion.
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Lambert B, Hedt C, Daum J, Taft C, Chaliki K, Epner E, McCulloch P. Blood Flow Restriction Training for the Shoulder: A Case for Proximal Benefit. Am J Sports Med 2021; 49:2716-2728. [PMID: 34110960 DOI: 10.1177/03635465211017524] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Although blood flow restriction (BFR) is becoming increasingly popular in physical therapy and athletic training settings, little is known about the effects of BFR combined with low-intensity exercise (LIX) on muscles proximal to the site of occlusion. HYPOTHESIS/PURPOSE Determine whether LIX combined with BFR applied distally to the shoulder on the brachial region of the arm (BFR-LIX) promotes greater increases in shoulder lean mass, rotator cuff strength, endurance, and acute increases in shoulder muscle activation compared with LIX alone. We hypothesized that BFR-LIX would elicit greater increases in rotator cuff strength, endurance, and muscle mass. We also hypothesized that the application of BFR would increase EMG amplitude in the shoulder muscles during acute exercise. STUDY DESIGN Controlled laboratory study. METHODS 32 healthy adults were randomized into 2 groups (BFR group, 13 men, 3 women; No-BFR group, 10 men, 6 women) who performed 8 weeks of shoulder LIX (2 times per week; 4 sets [30/15/15/fatigue]; 20% maximum) using common rotator cuff exercises (cable external rotation [ER], cable internal rotation [IR], dumbbell scaption, and side-lying dumbbell ER). The BFR group also trained with an automated tourniquet placed at the proximal arm (50% occlusion). Regional lean mass (dual-energy x-ray absorptiometry), isometric strength, and muscular endurance (repetitions to fatigue [RTF]; 20% maximum; with and without 50% occlusion) were measured before and after training. Electromyographic amplitude (EMGa) was recorded from target shoulder muscles during endurance testing. A mixed-model analysis of covariance (covaried on baseline measures) was used to detect within-group and between-group differences in primary outcome measures (α = .05). RESULTS The BFR group had greater increases in lean mass in the arm (mean ± 95% CI: BFR, 175 ± 54 g; No BFR, -17 ± 77 g; P < .01) and shoulder (mean ± 95% CI: BFR, 278 ± 90 g; No BFR, 96 ± 61 g; P < .01), isometric IR strength (mean ± 95% CI: BFR, 2.9 ± 1.3 kg; No BFR, 0.1 ± 1.3 kg; P < .01), single-set RTF volume (repetitions × resistance) for IR (~1.7- to 2.1-fold higher; P < .01), and weekly training volume (weeks 4, 6-8, ~5%-22%; P < .05). Acute occlusion (independent of group or timepoint) yielded increases in EMGa during RTF (~10%-20%; P < .05). CONCLUSION Combined BFR-LIX may yield greater increases in shoulder and arm lean mass, strength, and muscular endurance compared with fatiguing LIX alone during rotator cuff exercises. These findings may be due, in part, to a greater activation of shoulder muscles while using BFR. CLINICAL RELEVANCE The present study demonstrates that BFR-LIX may be a suitable candidate for augmenting preventive training or rehabilitation outcomes for the shoulder.
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Affiliation(s)
- Bradley Lambert
- Orthopedic Biomechanics Research Laboratory, Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas, USA
| | - Corbin Hedt
- Orthopedic Biomechanics Research Laboratory, Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas, USA
| | - Joshua Daum
- Orthopedic Biomechanics Research Laboratory, Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas, USA
| | - Carter Taft
- Department of Kinesiology, Rice University, Houston, Texas, USA
| | - Kalyan Chaliki
- Department of Kinesiology, Rice University, Houston, Texas, USA
| | - Eden Epner
- Orthopedic Biomechanics Research Laboratory, Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas, USA
| | - Patrick McCulloch
- Orthopedic Biomechanics Research Laboratory, Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas, USA
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Lorenz D. Blood Flow Restriction: Cause for Optimism, But Let's Not Abandon The Fundamentals. Int J Sports Phys Ther 2021; 16:962-967. [PMID: 34123546 PMCID: PMC8169004 DOI: 10.26603/001c.23725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 05/10/2021] [Indexed: 11/21/2022] Open
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