Key result
Blood flow-restricted resistance exercise increased sarcomere length (1.769 vs 1.64 μm; P<0.001) and caused aberrant wave-like myofibril appearance compared to normal resistance exercise.
Why the study?
The acute effects of blood flow-restricted exercise training on skeletal muscle ultrastructure are poorly understood due to inconsistent findings and reliance on imprecise systemic markers of muscle damage.
Does blood flow-restricted resistance exercise alter skeletal muscle ultrastructure compared to normal resistance exercise in a healthy male?
Population
1 apparently healthy male with 13 years of resistance exercise
Comparison
BFR unilateral leg press (30% 1-RM) vs normal non-occluded leg press (70% 1-RM)
Design
Case report
Follow-up
30 min
Authors
Loading...
Alerts clinicians to possible novel muscle changes with blood flow restriction; hypothesis-generating and should not alter practice.
Case Report (n=1)
Does blood flow-restricted resistance exercise alter skeletal muscle ultrastructure compared to normal resistance exercise in a healthy male?
Absolute Event Rate: 1.769% vs 1.64%
p-value: p=<0.001
Blood flow-restricted exercise induces unique wave-like alterations in myofibril ultrastructure and increased sarcomere length compared to normal resistance exercise.
Wilburn et al. (2021) conducted a case report in Healthy (n=1). Blood flow-restricted (BFR) resistance exercise vs. Normal non-occluded resistance exercise (70% of 1-RM) was evaluated on Sarcomere length (p=<0.001). Blood flow-restricted resistance exercise increased sarcomere length (1.769 vs 1.64 μm; P<0.001) and caused aberrant wave-like myofibril appearance compared to normal resistance exercise.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: