Sanford Orthopedics and Sports Medicine, Sanford Health, Fargo, ND, USA.
Sanford Orthopedics and Sports Medicine, Sanford Health, Fargo, ND, USA.
Phys Ther Sport. 2021 Jan;47:78-84. doi: 10.1016/j.ptsp.2020.11.026. Epub 2020 Nov 10.
Assess lower-extremity blood flow restricted exercise (BFR) limb occlusion pressure (LOP) variability and identify related intrinsic characteristics using a portable Delphi BFR system.
Repeated measures.
Laboratory.
Forty-two healthy males (n = 25) and females (n = 17) (25.8 ± 5.2 y, 1.76 ±0 .09 m, 78.9 ± 14.9 kg) completed two visits. Brachial artery blood pressure, thigh circumferences (TC), and LOP were measured supine.
Linear mixed-effects models (LMM) and generalizability theory were used to evaluate LOP between legs and days, determine intrinsic characteristic relations, and assess random variance components.
LOP was not different between legs (p = .730) or days (p = .916; grand mean = 183.7 mmHg [178.4, 189.1]). LOP varied significantly between participants (p = .011, standard error = 47.3 mmHg). 47% of LOP variance was between participants, 18% and 6% was within participants between days and legs, respectively, and 28% was associated with random error. The relative error variance was 14.4 mmHg. Pulse pressure (PP) (p = .005) and TC (p = .040) were positively associated with LOP. A LMM including PP and TC predicted LOP with a mean absolute difference of 11.1 mmHg [9.7, 12.6] compared to measured LOP.
The relative error variance suggests that clinicians should measure LOP consistently for each patient to ensure BFR safety and effectiveness.
使用便携式血液限制训练（BFR）系统评估下肢血流受限运动（BFR）肢体闭塞压力（LOP）的变异性，并确定相关的内在特征。
重复测量。
实验室。
42 名健康男性（n=25）和女性（n=17）（25.8±5.2 岁，1.76±0.09 米，78.9±14.9 公斤）完成了两次访问。测量仰卧位肱动脉血压、大腿周长（TC）和 LOP。
线性混合效应模型（LMM）和概化理论用于评估腿间和天间的 LOP，确定内在特征关系，并评估随机方差分量。
LOP 腿间无差异（p=0.730）或天间无差异（p=0.916；总平均值为 183.7mmHg[178.4，189.1]）。LOP 参与者间差异显著（p=0.011，标准误差 47.3mmHg）。LOP 变异的 47%来自于参与者间，18%和 6%分别来自于参与者内天间和腿间，28%与随机误差相关。相对误差方差为 14.4mmHg。脉压（PP）（p=0.005）和 TC（p=0.040）与 LOP 呈正相关。包括 PP 和 TC 的 LMM 预测 LOP 与实测 LOP 相比，平均绝对差为 11.1mmHg[9.7，12.6]。
相对误差方差表明，临床医生应始终如一地为每位患者测量 LOP，以确保 BFR 的安全性和有效性。
