Centre for Healthy Ageing, Murdoch University, Perth, Australia.
Discipline of Exercise Science, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Australia.
Eur J Sport Sci. 2023 Aug;23(8):1528-1537. doi: 10.1080/17461391.2023.2194274. Epub 2023 Apr 4.
This study investigated the impact of blood flow restriction (BFR) during treadmill walking on gait kinematics. Twenty-one participants completed one familiarisation and four experimental sessions, including two walking speeds (moderate [5.0 ± 0.3km·h] and fast [6.4 ± 0.4km·h]) and two occlusion conditions (BFR [60% of arterial occlusion pressure] and unrestricted). For each exercise intensity, the BFR session was performed first. Participants were instructed to walk as long as possible, with sessions capped at 20 min. Unrestricted sessions were time-matched, and the order of exercise intensity was randomised. Kinematics were collected over 10s every minute using retro-reflective markers affixed to specific body landmarks. Ratings of perceived exertion and discomfort were collected every two minutes. Blood samples were collected from the fingertip pre-exercise and the finger and toe post-exercise, and were analysed for lactate, electrolytes, and markers of cell-membrane damage. During the BFR sessions the cuffs remained inflated while the blood samples were collected. Fast-walk BFR sessions exhibited higher anterior trunk flexion (= 0.001) and knee flexion during stance (= 0.001) compared to all other sessions. Step width was increased during BFR sessions (= 0.001), but no difference in step length (= 0.300) or cadence (= 0.922) were observed. The time required to elicit change in anterior trunk flexion and plantar-flexion angle at toe-off was shorter during BFR sessions (= 0.024). The BFR sessions elicited the highest ratings of perceived exertion and discomfort, as well as blood lactate concentration ( ≤ 0.001). Application of BFR during moderate and fast treadmill walking modifies gait kinematics and exacerbates exercise-related sensations as well as blood lactate concentration.
本研究调查了在跑步机行走过程中应用血流限制（BFR）对步态运动学的影响。21 名参与者完成了一次熟悉和四次实验，包括两种步行速度（中等[5.0±0.3km·h]和快速[6.4±0.4km·h]）和两种闭塞条件（BFR[动脉闭塞压的 60%]和无限制）。对于每种运动强度，首先进行 BFR 训练。参与者被要求尽可能长时间行走，每个训练组时长限制为 20 分钟。无限制训练组时长与 BFR 组相同，运动强度顺序随机。使用贴在特定身体标志上的反光标记，每分钟收集 10 秒的运动学数据。每两分钟收集一次感知用力和不适的评分。运动前、运动后采集指尖和脚趾的血液样本，分析乳酸、电解质和细胞膜损伤标志物。在 BFR 训练组中，当收集血液样本时，袖带仍保持充气状态。与其他所有训练组相比，BFR 快速行走组在站立时前躯干前屈（=0.001）和膝关节屈曲（=0.001）更高。在 BFR 训练组中步宽增加（=0.001），但步长（=0.300）和步频（=0.922）没有差异。在 BFR 训练组中，从初始前躯干前屈和足趾离地时的跖屈角度改变所需的时间更短（=0.024）。BFR 训练组引起的感知用力和不适评分最高，以及血乳酸浓度最高（ ≤ 0.001）。在中等和快速跑步机行走过程中应用 BFR 会改变步态运动学，并加剧与运动相关的感觉以及血乳酸浓度。
