Key result
Blood flow restriction at 60% pressure during half-squat exercise significantly increased mean intraocular pressure compared to no restriction (19.0 vs 18.0 mmHg; p=0.048).
Why the study?
To determine the effect of blood flow restriction applied to the legs at 40% and 60% pressures on intraocular pressure during half-squat exercise.
Does blood flow restriction during resistance training increase intraocular pressure in healthy physically active subjects?
RCT (n=17)
Random order
Does blood flow restriction during resistance training increase intraocular pressure in healthy physically active subjects?
Answers are grounded in this paper and cite their sources.
Low-pressure (40%) blood flow restriction during moderate-load resistance exercise does not significantly increase intraocular pressure compared to no restriction, suggesting it may be a safe strength training strategy for individuals needing stable IOP.
Objective: To determine the effect of blood flow restriction (BFR) applied to the legs at different pressures (40% and 60%) on intraocular pressure (IOP) during the execution of ten repetitions maximum (10RM) in the half-squat exercise. Methods: Quasi-experimental, prospective study with 17 healthy physically active subjects (9 males and 8 females; 24.1 ± 4.2 years). Two sessions were conducted. The 10RM load was determined in the first session. The second session consisted of 10RM under three BFR conditions (no-BFR, 40%-BFR, and 60%-BFR) that were applied in random order. IOP was measured before each condition, immediately after each repetition, and after 1 minute of passive recovery. A two-way repeated-measures ANOVA (restriction type [no-BFR, 40%-BFR, and 60%-BFR] x measurement point [basal, repetitions 1–10, and recovery]) was applied on the IOP measurements. Results: A significant main effect of the BFR condition (p = .022, ƞp2 = 0.21) was observed due to the significantly higher mean IOP values for the 60%-BFR (19.0 ± 0.7 mmHg) compared to the no-BFR (18.0 ± 0.8 mmHg; p = .048, dunb = 1.30). Non-significant differences with a large effect size were reached between 60%-BFR and 40%-BFR (18.1 ± 0.8 mmHg; p = .081, dunb = 1.16) and between no-BFR and 40%-BFR (p = .686, dunb = 0.18). IOP increased approximately 3–4 mmHg from baseline to the last repetition. Conclusions: Low-pressure BFR (40%-BFR) in combination with moderate-load (10RM load) resistance exercise could be an effective and safe strength training strategy while avoiding IOP peaks associated with heavy-load resistance exercises. These findings incorporate novel insights into the most effective exercise strategies in individuals who need to maintain stable IOP levels (e.g., glaucoma patients).
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Gené‐Morales et al. (2022) conducted an RCT in Healthy physically active subjects (n=17). Blood flow restriction (BFR) vs. No-BFR was evaluated on Mean intraocular pressure (IOP) (dunb 1.30, p=0.048). Blood flow restriction at 60% pressure during half-squat exercise significantly increased mean intraocular pressure compared to no restriction (19.0 vs 18.0 mmHg; p=0.048).
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