■可穿戴近红外光谱(NIRS)可用于动态运动时,以反映肌肉氧气输送和摄取的平衡。这项研究描述了在增量循环测试中,NIRS运动后复氧的行为和可靠性,该行为是四个肌肉部位运动强度的函数。我们在运动科学和临床应用的背景下讨论了更快和更慢的复氧动力学的生理成分。我们假设在更高强度下复氧会更慢,运动肌肉会比辅助肌肉更快。我们量化了每个站点的重测可靠性和一致性。
■21名受过训练的自行车手进行了两次递增循环方案的试验,工作阶段5分钟,阶段之间休息1分钟。从运动肌外侧肌和股直肌记录NIRS,和副腰椎旁和三角肌。将复氧时间过程分析为从工作结束到休息期间峰值复氧幅度的一半的半恢复时间(HRT)。参与者之间的变异系数(CV),参与者内部测量的标准误差(SEM),重测信度的组内相关系数(ICC)评估为50%,75%,和100%峰值工作负载。线性混合效应模型用于比较工作量和肌肉部位之间的差异。
■HRT随着VL工作负载的增加而变慢,射频,PS,但不是DL。在所有工作负荷下,VL在肌肉部位的复氧最快(HRT最低)(HRT=8,12,17s,50%,75%,100%工作负载,分别)。VL也具有最大的可靠性和一致性。肌肉部位之间的HRT依次较慢,顺序为VL■这项研究强调了在运动过程中在多个肌肉部位使用可穿戴NIRS的潜力。随着强度的增加,局部肌肉部位的复氧动力学有所不同。VL的中等到良好的可靠性支持其在运动科学和临床应用中的日益使用。其他肌肉部位的可靠性较低,表明它们不适合单独使用。但当组合时可能会增加信息,以更好地反映不同强度运动期间的全身强度和疲劳。
UNASSIGNED: Wearable near-infrared spectroscopy (NIRS) can be used during dynamic exercise to reflect the balance of muscle oxygen delivery and uptake. This study describes the behaviour and reliability of postexercise reoxygenation with NIRS as a function of exercise intensity at four muscle sites during an incremental cycling test. We discuss physiological components of faster and slower reoxygenation kinetics in the context of sport science and clinical applications. We hypothesised that reoxygenation would be slower at higher intensity, and that locomotor muscles would be faster than accessory muscles. We quantified test-retest reliability and agreement for each site.
UNASSIGNED: Twenty-one trained cyclists performed two trials of an incremental cycling protocol with 5-min work stages and 1-min rest between stages. NIRS was recorded from the locomotor vastus lateralis and rectus femoris muscles, and accessory lumbar paraspinal and lateral deltoid muscles. Reoxygenation time course was analysed as the half-recovery time (HRT) from the end of work to half of the peak reoxygenation amplitude during rest. Coefficient of variability (CV) between participants, standard error of the measurement (SEM) within participants, and intraclass correlation coefficient (ICC) for test-retest reliability were evaluated at 50%, 75%, and 100% peak workloads. A linear mixed-effects model was used to compare differences between workloads and muscle sites.
UNASSIGNED: HRT was slower with increasing workload in the VL, RF, and PS, but not DL. VL had the fastest reoxygenation (lowest HRT) across muscle sites at all workloads (HRT = 8, 12, 17 s at 50%, 75%, 100% workload, respectively). VL also had the greatest reliability and agreement. HRT was sequentially slower between muscle sites in the order of VL < RF < PS < DL, and reliability was lower than for the VL.
UNASSIGNED: This study highlights the potential for using wearable NIRS on multiple muscle sites during exercise. Reoxygenation kinetics differ between local muscle sites with increasing intensity. Moderate-to-good reliability in the VL support its increasing use in sport science and clinical applications. Lower reliability in other muscle sites suggest they are not appropriate to be used alone, but may add information when combined to better reflect systemic intensity and fatigue during exercise at different intensities.