Low-intensity resistance training with blood flow restriction increased calf filtration capacity by 26%, whereas unrestricted training did not significantly increase it.
Does short-term low-intensity resistance training with blood flow restriction improve microvascular filtration capacity in healthy males?
Low-intensity resistance training with blood flow restriction enhances microvascular filtration capacity and muscle strength compared to training without restriction.
Resistance training increases muscle strength and endurance but may require high intensity and long duration to enhance capillarity. Vascular occlusion during low-load resistance training augments the strength and endurance gains compared with low-load resistance training alone, but in this study we investigated whether it also promotes microvascular filtration capacity, an index of capillarity. Nine healthy males performed short-term low-intensity resistance training of the calf muscles (four sets of 50 heel raises, three times a week for 4 weeks) under restricted (thigh cuff inflated to 150 mmHg on the non-dominant leg) or unrestricted (dominant leg without thigh cuff) blood flow conditions. Before and after resistance training, calf filtration capacity and resting blood flow were assessed by strain gauge plethysmography, and calf muscle strength and fatigue were assessed respectively by maximal voluntary contraction and force decline during electrically evoked ischaemic contractions in both legs. Calf filtration capacity increased by 26% in the restricted leg but did not increase significantly in the unrestricted leg. Calf muscle strength was 18% greater in the restricted leg but unchanged in the unrestricted leg. Calf muscle fatigue and resting blood flow did not change in either leg. Resistance training promoted microvascular filtration capacity, an effect that was somewhat enhanced by blood flow restriction, and could be due to increased capillarization.
Evans et al. (Fri,) conducted a other in Healthy (n=9). Low-intensity resistance training with blood flow restriction vs. Low-intensity resistance training without blood flow restriction was evaluated on Calf filtration capacity. Low-intensity resistance training with blood flow restriction increased calf filtration capacity by 26%, whereas unrestricted training did not significantly increase it.