Low-Intensity Blood Flow Restriction Training as a Pre-Operative Rehabilitative Modality to Improve Post-Operative Outcomes for ACL Reconstruction

2020 ◽  
Author(s):  
Keyword(s):  
Blood Flow ◽  
Acl Reconstruction ◽  
Blood Flow Restriction ◽  
Flow Restriction ◽  
Low Intensity ◽  
Operative Outcomes

Pressor Responses To High And Low-intensity Continuous Or Interval Cycling With/without Blood Flow Restriction.

2017 ◽  
Vol 49 (5S) ◽  
pp. 254
Author(s):  
Bianca Galletti ◽  
Francisco Batista ◽  
Jarbas Domingos-Gomes ◽  
Eduardo Freitas ◽  
Piettra Pereira ◽  
...  
Keyword(s):  
Blood Flow ◽  
Blood Flow Restriction ◽  
Flow Restriction ◽  
Low Intensity ◽  
Pressor Responses ◽  
Interval Cycling

scholarly journals Blood Flow Restriction Training Does Not Improve Quadriceps Strength After Anterior Cruciate Ligament Reconstruction

2019 ◽  
Vol 7 (7_suppl5) ◽  
pp. 2325967119S0029
Author(s):  
Michael Curran ◽  
Asheesh Bedi ◽  
Christopher Mendias ◽  
Edward M. Wojtys ◽  
Megan Kujawa ◽  
...  
Keyword(s):  
Blood Flow ◽  
Acl Reconstruction ◽  
Cruciate Ligament ◽  
Quadriceps Strength ◽  
Blood Flow Restriction ◽  
Effect Sizes ◽  
Leg Press ◽  
Symmetry Index ◽  
Flow Restriction ◽  
Anterior Cruciate

Objectives: Blood flow restriction training (BFRT) involves obstruction of venous outflow of working muscles during exercise and may lead to more substantial recovery of quadriceps strength after anterior cruciate ligament (ACL) reconstruction. The purpose of this study is to examine the effects of BFRT in ACL reconstruction patients before and after exposure to BFRT. Methods: This study was a randomized controlled trial in which 36 patients who had torn their ACL and were scheduled to undergo ACL reconstructive surgery (ACLR) with an autograft were randomized to receive exercise with BFRT (N=18) or exercise without BFRT (N=18). Participants in both groups performed the same exercise, but either did or did not have blood flow restricted. The exercise component of the intervention consisted of all subjects performing a single-leg isokinetic leg press, at an intensity of 70% of the subjects’ one-repetition maximum, for four sets of ten repetitions two times per week for 8 weeks beginning at 8 weeks post-operatively. Patients randomized to the BFRT group performed the leg-press exercise with a blood flow restriction cuff applied to the thigh and set to a limb occlusion pressure of 80 percent. All participants were concurrently undergoing standard ACL rehabilitation at the same physical therapy clinic. Bilateral isometric (recorded at a knee angle of 90°) and isokinetic (60°/second) quadriceps strength were recorded using a Biodex dynamometer (System 4, Shirley, NY) prior to ACLR and after the conclusion of the 8-week intervention. Peak isometric and isokinetic quadriceps strength were utilized to generate isometric and isokinetic quadriceps symmetry indices ((ACLR limb strength/Healthy limb strength) x100). Change from baseline symmetry scores were then generated using the following equation: (post-intervention symmetry - pre-intervention symmetry)/pre-intervention symmetry in order to account for possible differences in strength between groups prior to intervention delivery. Change from baseline isometric and isokinetic quadriceps symmetry scores were then compared between groups (exercise with BFRT, exercise without BFRT) using one-way analysis of variance tests with an a priori α set to P≤ 0.05. Effect sizes (Cohen’s d) and 95% confidence intervals were also computed. Results: No significant differences were found for change from baseline isokinetic quadriceps symmetry index (P=0.39, BFRT mean=-0.05, Control mean=-0.19) or change from baseline isometric quadriceps symmetry index (P=0.62, BFRT mean=-0.04, control mean=-0.10). The effect sizes for isokinetic quadriceps symmetry index (d=0.28, 95% CI= -0.37, 0.93) and isometric quadriceps symmetry (d=0.16, 95% CI= -0.49, 0.80) were small with confidence intervals that crossed zero. Conclusion: An 8-week blood flow resistance training + exercise intervention did not increase quadriceps muscle strength in patients who had undergone ACL reconstruction. Based on our findings, application of blood flow restriction training in ACL reconstruction patients to improve quadriceps strength may not be warranted. Future studies may benefit from a longer follow-up and larger sample size.

scholarly journals Low intensity blood flow restriction exercise: Rationale for a hypoalgesia effect

2019 ◽  
Vol 132 ◽  
pp. 109370 ◽  
Author(s):  
Luke Hughes ◽  
Stephen David Patterson
Keyword(s):  
Blood Flow ◽  
Blood Flow Restriction ◽  
Flow Restriction ◽  
Low Intensity

Early phase adaptations in muscle strength and hypertrophy as a result of low-intensity blood flow restriction resistance training

2018 ◽  
Vol 118 (9) ◽  
pp. 1831-1843 ◽  
Author(s):  
Ethan C. Hill ◽  
Terry J. Housh ◽  
Joshua L. Keller ◽  
Cory M. Smith ◽  
Richard J. Schmidt ◽  
...  
Keyword(s):  
Blood Flow ◽  
Resistance Training ◽  
Muscle Strength ◽  
Early Phase ◽  
Blood Flow Restriction ◽  
Flow Restriction ◽  
Low Intensity

scholarly journals Blood Flow Restriction Therapy Preserves Whole Limb Bone and Muscle Following ACL Reconstruction

2019 ◽  
Vol 7 (3_suppl2) ◽  
pp. 2325967119S0019 ◽  
Author(s):  
Bradley Lambert ◽  
Corbin A. Hedt ◽  
Robert A. Jack ◽  
Michael Moreno ◽  
Domenica Delgado ◽  
...  
Keyword(s):  
Blood Flow ◽  
Bone Loss ◽  
Bone Mass ◽  
Acl Reconstruction ◽  
Blood Flow Restriction ◽  
Control Group ◽  
Type I ◽  
Leg Press ◽  
Flow Restriction ◽  
Post Surgery

Objectives: Patients often experience atrophy and bone loss immediately following anterior cruciate ligament (ACL) reconstruction. Rehabilitation (rehab) combined with blood flow restriction (BFR) therapy have been shown to mitigate muscle atrophy and reduce timelines for earlier return to function. Little is known about how BFR may impact bone loss. The objectives this study were to determine if BFR provides additional benefits when added to standard rehab in young active patients following ACL reconstruction with regards to preserving bone, recovering muscle, and regaining physical function. Methods: Fourteen active young adults (M=8, F=6; 23±7 yr; 170±10 cm, 75±14 kg) undergoing ACL repair via patellar tendon autograft were recruited, provided informed consent, and were randomized into two groups (CONTROL, n=7 & BFR, n=7) who performed 12wks of rehab beginning at 10 days post-surgery (2/wk). Both groups performed the same rehab protocol. However, during select exercises [quadriceps contractions wks1-3, bilateral leg press wk3-12, eccentric leg press wk4-12, hamstring curl wk4-6, eccentric hamstring curl wk7-12.], the BFR group exercised with 80% arterial limb occlusion using an automated tourniquet around the proximal thigh outfitted with Doppler (Delfi®). Exercise resistance was set at 20% of predicted 1-repetition maximum assessed in the contralateral limb. Exercises were performed for 4 sets of 30-15-15-15 repetitions separated by 30 s of rest. Functional assessments were performed at wk8 and wk12 post-surgery. Bone mineral density (BMD), bone mass, and lean muscle mass (LM) were measured using DEXA (Figure 1, GE®) at pre-surgery as well as wk6 and wk12 of rehab. Statistical Analysis: A 2(group) x 3(time) ANCOVA (co-varied on pre-surgery measures) was used to detect and compare changes in muscle and bone measures from pre-surgery at wk6 and wk12. A 2(group) x 2(time) ANOVA was used to detect and compare changes in functional outcomes tested at wk8 and wk12 between groups. Significant interactions were followed with a Tukey’s post hoc test for pairwise comparisons. Type I error was set at α=0.05. Results: Results are shown in Table 1. Both groups experienced similar decreases from pre-surgery measures in total LM at wk6 (p<0.05) with total lean mass in only the CONTROL group remaining diminished at wk12 (p<0.05). Whole leg LM in the injured limb was decreased in the CONTROL group, but not the BFR group, at both wk6 and wk12 (p<0.05). Thigh LM was found to be decreased in both groups at wk6 but to a greater extent in the CONTROL compared to the BFR group and remained decreased in only the CONTROL group at wk12. Whole leg bone mass was decreased in the control group at wk6 and in both groups wk12 (p<0.05). The CONTROL group was observed to have a decrease in BMD at the distal femur and proximal tibia as wk12 as well as the proximal fibula at wk6 and wk12 (p<0.05). Both groups demonstrated similar improvements in single leg squat distance, Y-balance, leg curl, and leg press from wk8 to wk12 of rehab (p<0.05). (Completed Data, N=32 anticipated by time of conference). Conclusion: In addition to recovering muscle to a greater extent than standard rehab alone, the addition of BFR to ACL rehab exercises appears to have a protective effect on bone. This effect also appears to not be limited to the site of cuff compression. Future studies are needed to examine the biochemical and mechanical mechanisms by which BFR may simultaneously act on bone and muscle. [Table: see text]

Kinetics of Intramuscular Inorganic Phosphate During Low Intensity Exercise With Blood Flow Restriction

2009 ◽  
Vol 41 ◽  
pp. 140-141
Author(s):  
Masato Sugaya ◽  
Satoshi Fujita ◽  
Riki Ogasawara ◽  
Hayao Ozaki ◽  
Mikako Sakamaki ◽  
...  
Keyword(s):  
Blood Flow ◽  
Inorganic Phosphate ◽  
Blood Flow Restriction ◽  
Flow Restriction ◽  
Low Intensity ◽  
Low Intensity Exercise ◽  
Kinetics Of

The Impact Of Lower Limb Blood Flow Restriction On Hemodynamics During Low Intensity Aerobic Exercise

2009 ◽  
Vol 41 ◽  
pp. 73
Author(s):  
Christopher Renzi ◽  
Jun Sugawara ◽  
Hirofumi Tanaka
Keyword(s):  
Blood Flow ◽  
Aerobic Exercise ◽  
Lower Limb ◽  
Blood Flow Restriction ◽  
Limb Blood Flow ◽  
Flow Restriction ◽  
Low Intensity ◽  
The Impact

Acute Muscular Responses To High Intensity And Low Intensity With Blood Flow Restriction Cycling

2014 ◽  
Vol 46 ◽  
pp. 883
Author(s):  
Daeyeol Kim ◽  
Jeremy P. Loenneke ◽  
Robert S. Thiebaud ◽  
Xin Ye ◽  
Grant Mouser ◽  
...  
Keyword(s):  
Blood Flow ◽  
High Intensity ◽  
Blood Flow Restriction ◽  
Flow Restriction ◽  
Low Intensity ◽  
Muscular Responses
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