Key result
Low-load eccentric training with blood flow restriction promoted gains in eccentric peak torque similar to high-load eccentric training in the first three weeks of training.
Why the study?
Studies on eccentric training with blood flow restriction still had gaps, especially regarding strength and muscle hypertrophy.
Does eccentric training with blood flow restriction improve muscle strength, hypertrophy, and performance compared to eccentric training without blood flow restriction in healthy untrained men?
RCT (n=61)
randomized
Does eccentric training with blood flow restriction improve muscle strength, hypertrophy, and performance compared to eccentric training without blood flow restriction in healthy untrained men?
Low-load eccentric training with blood flow restriction promotes early strength gains similar to high-load training without restriction, but does not alter muscle structure differently.
Eccentric training boosts knee extensor strength and performance without hypertrophy; extends evidence that low-load BFR matches high-load gains early.
Background/Objective studies on eccentric training with blood flow restriction (BFR) still has gaps, especially in strength and muscle hypertrophy . Therefore, this study aimed to analyze and compare the effects of six weeks of eccentric training of knee extensors at different load associated or not with BFR on strength, hypertrophy, and performance of knee extensors. Methods 61 men, healthy and untrained, performed six weeks of quadriceps muscle eccentric training in isokinetic dynamometer were randomized into four groups: high-load eccentric training with BFR (HLET-BFR), low-load eccentric training with BFR (LLET-BFR), high-load eccentric training (HLET) and low-load eccentric training (LLET). The strength, muscle structure and performance outcomes were evaluated at baseline, after 3 and 6 weeks of training. Results for eccentric peak torque in the first three weeks, HLET was superior to LLET, but similar to LLET-BFR. In the final three weeks, superiority was observed in relation to LLET-BFR; however, there was no difference in relation to HIET-BFR. For the outcomes isometric and concentric peak torque, muscle structure and performance, there were no differences between groups. Conclusion eccentric training led to strengthening of knee extensors and improved performance, but without altering the muscle structure. LLET-BFR promoted gains similar to HLET in the first three weeks of training.
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Biral et al. (2024) conducted an RCT in healthy and untrained (n=61). Eccentric training with blood flow restriction (BFR) vs. Eccentric training without BFR was evaluated on Eccentric peak torque, isometric and concentric peak torque, muscle structure, and performance. Low-load eccentric training with blood flow restriction promoted gains in eccentric peak torque similar to high-load eccentric training in the first three weeks of training.
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