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Effects of Superimposed Blood Flow Restriction on Isokinetic Knee Extension
Darío Rodrigo-Mallorca1, Joaquín Mollá-Sanchis1, Iván Chulvi-Medrano2
1Department of Physical and Sport Education, University of Valencia, 46010 Valencia, Spain.
Journal of Functional Morphology and Kinesiology
|May 23, 2025
Summary
Applying blood flow restriction (BFR) during knee extension exercises did not acutely alter maximal force production. This study found no significant ergogenic effect from superimposed BFR in physically active adults.
Area of Science:
- Exercise Physiology
- Biomechanics
- Sports Science
Background:
- Blood flow restriction (BFR) is increasingly studied for its potential training benefits.
- Its acute effects on isokinetic performance, particularly the moment-velocity relationship, require further investigation.
Purpose of the Study:
- To assess the immediate impact of superimposed BFR on knee extensor isokinetic concentric moment.
- To analyze changes in the moment-velocity curve with varying BFR intensities.
Main Methods:
- 37 physically active adults underwent isokinetic knee extensions at 300°/s, 210°/s, and 120°/s.
- Three conditions were tested: no BFR (BFR0), 40% maximal pressure occlusion (BFR40), and 80% MPO (BFR80).
- Isokinetic moments were measured using a BIODEX dynamometer.
Main Results:
- No significant interaction effects were observed between BFR condition and angular velocity on knee extensor moment.
- While not statistically significant across all participants, gender-specific interaction differences were noted.
- Specific torque values (Nm) at 300°/s, 210°/s, and 120°/s showed no consistent ergogenic effect with BFR application.
Conclusions:
- Superimposed BFR at 40% and 80% MPO does not acutely enhance maximal knee extensor moment or power.
- The current evidence suggests BFR may not provide a sufficient ergogenic effect for acute improvements in force production during isokinetic testing.
- Further research may explore chronic BFR effects or different application protocols.
