Key result
Incremental increases in blood flow restriction during walking increased muscle oxygen desaturation.
Why the study?
The study was conducted to determine the effect of different relative pressures of blood flow restriction on muscle oxygen saturation while walking at 3.0 mph (4.83 kph).
Do different percentages of blood flow restriction affect muscle oxygen saturation while walking in physically active healthy adults?
Do different percentages of blood flow restriction affect muscle oxygen saturation while walking in physically active healthy adults?
Incremental increases in limb occlusion pressure during walking bring about greater muscle oxygen desaturation, potentially inducing a larger adaptive response but intensifying perception of effort.
Answers are grounded in this paper and cite their sources.
May influence BFR walking prescriptions; hypothesis-generating for optimal LOP% in rehabilitation.
International Journal of Exercise Science 16(2): 411-428, 2023. The purpose of this investigation was to determine the effect of different relative pressures of blood flow restriction (BFR) on muscle oxygen saturation (SmO2) while walking at 3.0 mph (4.83 kph). Fifteen physically active healthy adults performed seven 5-minute stages of walking at 3.0 mph with a blood flow restriction cuff applied to the proximal portion of the left or right leg while bilateral SmO2 changes were measured using near infra-red spectroscopy (NIRS) on the medial head of the gastrocnemius (GM) and vastus lateralis (VL) muscles. Other measurements including heart rate (HR), blood pressure (BP), rating of perceived exertion (RPE), and ground contact time balance (GCTB) were also collected. SmO2 measurements were analyzed using two-way repeated measures (RM) ANOVA while other measurements were analyzed using one-way RM ANOVA. We observed a significant main effect of LOP% (limb occlusion pressure) on the difference in total area of desaturation that occurred during each occlusion stage (ADS), p < 0.0001 η2 = .336, early ΔSmO2, p < 0.0001 in both the GAS η2 = .132 and VL η2 = .335. The results suggest that there are significant differences in SmO2 desaturation between 40%, 80%, and 100% LOP. Our findings suggest that incremental increases in LOP will bring about greater SmO2 desaturation during walking and may therefore induce a larger adaptive response on the muscles. However, increased LOP% may intensify perception of effort.
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Shriver et al. (2023) studied Healthy adults (n=15). Blood flow restriction vs. Different LOP percentages was evaluated on Difference in total area of desaturation (ADS) and early ΔSmO2 (η2 = 0.336, p=<0.0001). Incremental increases in blood flow restriction during walking increased muscle oxygen desaturation.
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