额前NIRS信号在递增循环运动过程中不受额多普勒流量的影响。

IF 1.3 4区 医学 Q4 PHYSIOLOGY Clinical Physiology and Functional Imaging Pub Date : 2023-05-27 DOI:10.1111/cpf.12837
Mark E. Hartman
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引用次数: 0

摘要

近红外光谱(NIRS)用于测量组织中氧合血红蛋白(O2-Hb)和脱氧血红蛋白(HHb)的浓度。在运动的背景下,NIRS比其他神经成像技术具有更高的信噪比。然而,部分信号可能受到前额浅表皮肤毛细血管体温调节性充血的影响。运动过程中的近红外信号在多大程度上反映了大脑或脑外血液动力学变化,这一直是争议的根源。然而,皮肤血流的影响可能会减弱,这取决于NIRS技术(例如,最大光电极分离距离>3.5的频域机器 cm)。本研究的目的是比较渐进式运动与渐进式局部加热诱导的前额皮肤直接血管舒张过程中前额皮肤血流量和脑血红蛋白浓度的变化。30名参与者(12名女性,18名男性;年龄:20.8岁 ± 3.2年;体重指数:23.8 ± 3.7 kg·m-2)参与研究。用激光多普勒流量对前额皮肤血流量进行定量,并用近红外光谱测量大脑O2-Hb和HHb的绝对浓度。局部加热显著增加了多普勒流量信号随时间的变化,这些变化与皮肤温度显著相关。在递增运动过程中,皮肤温度、多普勒流量、O2-Hb和HHb增加,但与多普勒流量一致相关的唯一显著变化是皮肤温度。因此,前额皮肤血流量的显著变化可能不会显著影响NIRS血红蛋白数据,这取决于所使用的NIRS设备的类型。
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Prefrontal NIRS signal is unaffected by forehead Doppler flux during incremental cycling exercise

Near-infrared spectroscopy (NIRS) is used to measure tissue concentrations of oxyhemoglobin (O2Hb) and deoxyhemoglobin (HHb). In the context of exercise, NIRS confers a higher signal-to-noise ratio than other neuroimaging techniques. However, part of the signal may be influenced by thermoregulatory hyperemia in the superficial cutaneous capillaries of the forehead. The degree to which NIRS signals during exercise reflect cerebral or extracerebral hemodynamic changes is a continuing source of controversy. However, the influence of skin blood flow may be attenuated depending on the NIRS technique (e.g., frequency domain machines with maximal optode separation distances >3.5 cm). The purpose of this study was to compare the changes in forehead skin blood flow and cerebral hemoglobin concentration during incremental exercise versus direct vasodilation of the forehead skin induced by gradual local heating. Thirty participants (12 females, 18 males; age: 20.8 ± 3.2 years; body mass index: 23.8 ± 3.7 kg·m−2) participated in the study. Forehead skin blood flow was quantified laser Doppler flux and absolute concentrations of cerebral O2Hb and HHb were measured by NIRS. Local heating significantly increased the Doppler flux signal across time and these changes were significantly correlated with skin temperature. During incremental exercise, skin temperature, Doppler flux, O2Hb and HHb increased however, the only significant change that was consistently correlated with Doppler flux was skin temperature. Therefore, a significant change in forehead skin blood flow may not significantly the NIRS hemoglobin data, depending on the type of NIRS device used.

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来源期刊
CiteScore
3.40
自引率
5.60%
发文量
62
审稿时长
6-12 weeks
期刊介绍: Clinical Physiology and Functional Imaging publishes reports on clinical and experimental research pertinent to human physiology in health and disease. The scope of the Journal is very broad, covering all aspects of the regulatory system in the cardiovascular, renal and pulmonary systems with special emphasis on methodological aspects. The focus for the journal is, however, work that has potential clinical relevance. The Journal also features review articles on recent front-line research within these fields of interest. Covered by the major abstracting services including Current Contents and Science Citation Index, Clinical Physiology and Functional Imaging plays an important role in providing effective and productive communication among clinical physiologists world-wide.
期刊最新文献
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