• Rogerio N Soares, Yasina B Somani, Ahmad M Al-Qahtani, David N Proctor, and Juan M Murias.
• Faculty of Kinesiology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada.
• Microvasc. Res. 2019 Sep 1; 125: 103879.

BackgroundImpairments at the microvascular level might lead to more overt cardiovascular complications, therefore, being able to early detect microvascular dysfunction would be beneficial. Thus, the present study investigated whether near-infrared spectroscopy (NIRS) assessment of microvascular responsiveness (reoxygenation slope, %.s-1) would detect the detrimental effects on the forearm microvasculature following a period of arterial occlusion. Similarly, the effects of prolonged forearm ischemia on brachial artery function were also assessed by flow-mediated dilation (%FMD).MethodsFourteen individuals were tested before (Pre), immediately after (PostPI), 30 min after (Post30), and 60 min after (Post60) prolonged forearm ischemia. The Pre, Post30, and Post60 interventions consisted of 5 min of blood flow occlusion, whereas the postPI involved a 20-min occlusion period.ResultsThe reoxygenation slope was reduced at PostPI (1.33 ± 0.72%.s-1 vs. 1.79 ± 0.68%.s-1 Pre; p < 0.05), but not at Post30 (1.93 ± 0.70%.s-1) and Post60 (1.87 ± 0.85%.s-1) (both p > 0.05 vs. Pre). Similarly, the brachial FMD response was reduced at PostPI (7.4 ± 3.9% vs. 10.9 ± 2.9% Pre; p < 0.05), but not at Post30 (11.3 ± 4.1%) or Post60 (11.8 ± 4.3%) (both p > 0.05 vs. Pre).ConclusionThese findings show that NIRS-derived reoxygenation slope detects the transient detrimental effects of prolonged ischemia within the forearm microvasculature. Additionally, this study found that the reduction in forearm microvascular responsiveness might have contributed to the decreased brachial artery FMD responsiveness.Copyright © 2019 Elsevier Inc. All rights reserved.

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