Reduced Scattering Coefficient During Incremental Exercise Is Constant Without Being Affected by Changes in Muscle Oxygenation or Hemodynamics.
Reduced Scattering Coefficient During Incremental Exercise Is Constant Without Being Affected by Changes in Muscle Oxygenation or Hemodynamics.
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增量运动过程中散射系数的降低是恒定的，不受肌肉氧合或血流动力学变化的影响。
DOI：
10.1007/978-3-030-48238-1_17
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Hamaoka T.
中科院分区：
文献类型：
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作者：
Endo T;Kime R;Fuse S;Murase N;Kurosawa Y;Hamaoka T.
先前的研究报道，由于血容量的变化或代谢副产物的积累，在坡道增量运动中，股外侧肌的减少散射系数（μs’）发生了变化。我们旨在阐明运动过程中脱氧和血容量变化对不同有氧能力受试者μs动力学的影响。23名健康的年轻男性参加了这项研究。所有受试者均进行斜坡-增量循环运动，直至精疲力竭，并按vo2峰中位数分为低氧组（低：n= 12；每千克无脂质量肺摄氧量峰值（vo2峰），54.2±5.3 mL/kg/min）和高氧能力组（高：n= 11； vo2峰，69.7±5.2 mL/kg/min）。通过三波长（760、800和830 nm）时间分辨近红外光谱监测运动期间股外侧肌脱氧血红蛋白和肌红蛋白浓度（脱氧[Hb + Mb]）和总[Hb + Mb]（总[Hb + Mb]）。同样，连续监测各波长的μs '。随着运动强度的增加，两组的脱氧[Hb + Mb]和总[Hb + Mb]均显著增加，运动时脱氧[Hb + Mb]和总[Hb + Mb]峰幅平均值较运动开始时分别增加106.4%和17.9%。此外，总[Hb + Mb]的峰值幅度在High时明显更大。相反，运动过程中各波长μs '均无变化，两组间无差异，提示运动过程中较大的脱氧和血容量变化对μs动力学的影响不大。
Previous studies have reported that the reduced scattering coefficient (μs′) in the vastus lateralis changes during ramp-incremental exercise due to blood volume changes or accumulation of metabolic by-products. We aimed to clarify the influences of deoxygenation and blood volume changes during exercise on μs′ dynamics in subjects with various aerobic capacities. Twenty-three healthy young men participated in this study. All subjects performed a ramp-incremental cycling exercise until exhaustion and were divided into two groups: lower (Low:n= 12; peak pulmonary oxygen uptake per kg of fat-free mass (VO2peak), 54.2 ± 5.3 mL/kg/min) and higher aerobic capacity group (High:n= 11; VO2peak, 69.7 ± 5.2 mL/kg/min) by median of VO2peak. Deoxygenated hemoglobin and myoglobin concentrations (deoxy[Hb + Mb]) and total [Hb + Mb] (total[Hb + Mb]) in the vastus lateralis were monitored during the exercise by three-wavelength (760, 800, and 830 nm) time-resolved NIRS. Similarly, μs′ at each wavelength was continuously monitored. With increasing exercise intensity, deoxy[Hb + Mb] and total[Hb + Mb] significantly increased in both groups, and the average values of the peak amplitudes of deoxy[Hb + Mb] and total[Hb + Mb] during exercise showed a 106.4% increase and a 17.9% increase from the start of the exercise, respectively. Furthermore, the peak amplitude of total[Hb + Mb] was significantly greater in High. Conversely, there were no changes in μs′ at any wavelength during exercise and no differences between two groups, suggesting that the great deoxygenation and blood volume changes during incremental exercise have little effect on μs′ dynamics.