Key result
Low-intensity arm-curl resistance exercise with blood flow restriction significantly increased oxygenated hemoglobin concentration in the contralateral motor cortex compared to exercise without restriction.
Why the study?
Does single-arm curl resistance exercise with blood flow restriction increase cerebral blood flow in healthy male subjects?
Does single-arm curl resistance exercise with blood flow restriction increase cerebral blood flow in healthy male subjects?
Low-intensity resistance exercise with blood flow restriction significantly increases cerebral blood flow in the contralateral motor cortex compared to exercise without restriction.
Hypothesis-generating for cerebral blood flow with BFR; larger patient trials needed before clinical consideration.
Low-intensity resistance exercise with blood flow restriction (BFR), also known as "Kaatsu," causes a dramatic increase in the secretion of growth hormone. Several reports have shown that Kaatsu is effective for training in patients with stroke. However, the influence of Kaatsu training on brain function remains unclear. This study aimed to investigate the acute effects of Kaatsu training on blood flow in the brain. Six healthy male subjects performed a single-arm curl with and without BFR using 20% of the weight of 1 repetition maximum(RM); 1 set of 30 repetitions (reps) was followed by 3 sets of 15 reps, with a 30-s interval in between. During the procedure, cerebral blood flow was measured using near-infrared spectroscopy (NIRS). During arm curls with BFR, the oxygenated hemoglobin (oxy-Hb) concentration of the contralateral motor cortex increased significantly compared to that during curls without BFR. The results of this study suggest that Kaatsu training has a positive effect on the brain by increasing cerebral blood flow and that it is useful for treating diseases such as stroke and cognitive disorders caused by brain dysfunction.
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Morita et al. (2010) studied Healthy (n=6). Blood flow restriction (Kaatsu) during arm-curl resistance exercise vs. Arm-curl resistance exercise without blood flow restriction was evaluated on Relative change in oxygenated hemoglobin (oxy-Hb) concentration in the contralateral motor cortex during left-arm curls (p=<0.05). Low-intensity arm-curl resistance exercise with blood flow restriction significantly increased oxygenated hemoglobin concentration in the contralateral motor cortex compared to exercise without restriction.
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