Publication: BLOOD FLOW RESTRICTION TRAINING FOR CHRONIC QUADRICEPS ATROPHY AND WEAKNESS
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Date
2026-04-16
Journal Title
Journal ISSN
Volume Title
Type
Poster
Abstract
Blood flow restriction training (BFRT) is an exercise modality that utilizes blood flow occlusion in the affected extremity during low-load training. Partially occluding blood flow leads to a hypoxemic state in the affected limb, resulting in build-up of anabolic metabolites, cellular swelling, and increased recruitment of fast-twitch muscle fibers. BFRT stresses muscles differently from typical high-load training. The purpose of this study was to determine if BFRT can reverse long-standing quadriceps atrophy and weakness in an individual following an ACL reconstruction and meniscus repair.
A single subject with residual quadriceps atrophy, weakness, and functional impairment trained with BFRT for 8-weeks. The subject participated in two training sessions per week targeting the affected extremity, consisting of three quadriceps exercises at 80% occlusion following a 30, 15, 15, 15 repetition protocol. Outcome measures included thigh circumference and lower extremity strength, which were tested prior to, every 2 weeks during the intervention, and one-week post-training. Functional outcomes were assessed with video analysis of movement and the Knee Injury and Osteoarthritis Outcome Scale (KOOS) at the start and end of the study.
After the 8-week training period, a 1-week F/U was conducted to reassess the subjects' knee extensor strength (MVIC), thigh circumference, and KOOS. Thigh circumference decreased across measurement sites (involved limb: 45 to 43 cm at 5 cm superior to the top of patella and 53.5 to 50.5 cm 15 cm superior to the top of patella). Strength asymmetry declined from 69.8% to 49.8% of the uninvolved limb. KOOS improved from 81.55 to 88.10 with subscale increases in symptoms (57.14 to 67.86), sport/rec (70.00 to 90.00), and QoL (50 to 62.5).
This study suggests that despite decreases in quadriceps strength and size, BFRT may improve functional outcomes.