Why the study?
To investigate whether blood flow restriction without concomitant exercise mitigates strength reduction and atrophy of thigh muscles in subjects undergoing lower limb immobilization.
Does blood flow restriction without concomitant exercise mitigate strength reduction and atrophy of thigh muscles in subjects under immobilization for lower limbs?
Does blood flow restriction without concomitant exercise mitigate strength reduction and atrophy of thigh muscles in subjects under immobilization for lower limbs?
Blood flow restriction without exercise may help mitigate muscle atrophy and strength loss during lower limb immobilization, but current evidence is limited by poor study quality.
Passive BFR may mitigate thigh muscle loss during immobilization; extends sparse evidence but requires larger RCTs before practice change.
Purpose: To investigate whether blood flow restriction (BFR) without concomitant exercise mitigated strength reduction and atrophy of thigh muscles in subjects under immobilization for lower limbs. Methods: The following databases were searched: PubMed, CINAHL, PEDro, Web of Science, Central, and Scopus. Results: The search identified 3 eligible studies, and the total sample in the identified studies consisted of 38 participants. Isokinetic and isometric torque of the knee flexors and extensors was examined in 2 studies. Cross-sectional area of thigh muscles was evaluated in 1 study, and thigh girth was measured in 2 studies. The BFR protocol was 5 sets of 5 min of occlusion and 3 min of free flow, twice daily for approximately 2 weeks. As a whole, the included studies indicate that BFR without exercise is able to minimize strength reduction and muscular atrophy after immobilization. It is crucial to emphasize, however, that the included studies showed a high risk of bias, especially regarding allocation concealment, blinding of outcome assessment, intention-to-treat analyses, and group similarity at baseline. Conclusion: Although potentially useful, the high risk of bias presented by original studies limits the indication of BFR without concomitant exercise as an effective countermeasure against strength reduction and atrophy mediated by immobilization.
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Cerqueira et al. (2019) studied this question.
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