Cardiovascular Aging Research Laboratory, Department of Kinesiology and Health Education, The University of Texas at Austin, Austin, TX, USA.
Med Sci Sports Exerc. 2010 Apr;42(4):726-32. doi: 10.1249/MSS.0b013e3181bdb454.
Exercise with limb blood flow restriction (BFR) is a very popular exercise modality in Japan and is spreading widely to the rest of the world. The underlying principle of this training modality is that under the conditions of restricted blood flow, even low-intensity exercise can provide significant muscle strength and hypertrophy. One concern, however, is that BFR during exercise may place unnecessary burden on those with compromised cardiac function.
We determined the impact of leg BFR during walking on cardiovascular function in 17 young (26 ± 1 yr) healthy volunteers. Each subject underwent five bouts of 2-min treadmill walking at 2 miles·h(-1) with 1-min interval either with or without tourniquet cuffs inflated on both thighs.
Heart rate increased more during the BFR session, whereas stroke volume decreased greater during the BFR session. Blood pressure increased significantly and substantially during the BFR session. Consequently, an increase in double product, an index of myocardial oxygen demand, was more than threefold higher in the BFR condition. Systemic arterial compliance evaluated by stroke volume/pulse pressure ratio significantly increased during the control session by 14% but reduced during the BFR condition by 19%. Popliteal artery flow-mediated vasodilation decreased significantly after the exercise with BFR but not after the control session.
Even at low intensity, the aerobic exercise with BFR requires a greater cardiac work and decreases endothelial function. Limb BFR during exercise may need to be more cautiously prescribed to those with compromised cardiac conditions.
在日本，带血流限制（BFR）的运动是一种非常流行的运动方式，正在向世界其他地区广泛传播。这种训练方式的基本原理是，在血流受限的情况下，即使是低强度的运动也能提供显著的肌肉力量和肥大。然而，一个令人担忧的问题是，运动时的 BFR 可能会给心脏功能受损的人带来不必要的负担。
我们确定了 17 名年轻（26 ± 1 岁）健康志愿者在行走时腿部 BFR 对心血管功能的影响。每位受试者在 2 英里/小时的跑步机上进行 5 次 2 分钟的行走，每次行走之间有 1 分钟的间隔，大腿上的止血带充气或不充气。
BFR 期间心率增加更多，而 BFR 期间每搏量减少更多。血压在 BFR 期间显著且大幅升高。因此，BFR 条件下的双乘积（心肌需氧量的指标）增加了三倍多。通过每搏量/脉搏压比评估的系统动脉顺应性在对照期间显著增加了 14%，但在 BFR 条件下减少了 19%。BFR 运动后，腘动脉血流介导的血管扩张明显下降，但对照运动后无此变化。
即使在低强度下，带 BFR 的有氧运动也需要更大的心脏工作量，并降低内皮功能。对于心脏功能受损的人，带 BFR 的运动可能需要更谨慎地规定。
