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This Article Full Text Full Text (PDF) All Versions of this Article: 287/1/H374    most recent 00958.2003v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (40) Citing Articles via Google Scholar Google Scholar Articles by de Groot, P. C. E. Articles by Hopman, M. T. E. Search for Related Content PubMed PubMed Citation Articles by de Groot, P. C. E. Articles by Hopman, M. T. E.

Preserved flow-mediated dilation in the inactive legs of spinal cord-injured individuals

Department of Physiology, University Medical Centre, 6500 HB Nijmegen, The Netherlands

Submitted 9 October 2003 ; accepted in final form 25 February 2004

The aim of the study was to assess endothelial function, measured by flow-mediated dilation (FMD), in an inactive extremity (leg) and chronically active extremity (arm) within one subject. Eleven male spinal cord-injured (SCI) individuals and eleven male controls (C) were included. Echo Doppler measurements were performed to measure FMD responses after 10 and 5 min of arterial occlusion of the leg (superficial femoral artery, SFA) and the arm (brachial artery, BA), respectively. A nitroglycerine spray was administered to determine the endothelium independent vasodilatation in the SFA. In the SFA, relative changes in FMD were significantly enhanced in SCI compared with C (SCI: 14.1 ± 1.3%; C: 9.2 ± 2.3%), whereas no differences were found in the BA (SCI: 12.5 ± 2.9%; C: 14.2 ± 3.3%). Because the FMD response is directly proportional to the magnitude of the stimulus, the FMD response was also expressed relative to the shear rate. No differences between the groups were found for the FMD-to-shear rate ratio in the SFA (SCI:0.061 ± 0.023%/s^–1; C: 0.049 ± 0.024%/s^–1), whereas the FMD-to-shear rate ratio was significantly decreased in the BA of SCI individuals (SCI: 0.037 ± 0.01%/s^–1; C: 0.061 ± 0.027%/s^–1). The relative dilatory response to nitroglycerine did not differ between the groups. (SCI: 15.6 ± 2.0%; C: 13.4 ± 2.3%). In conclusion, our results indicate that SCI individuals have a preserved endothelial function in the inactive legs and possibly an attenuated endothelial function in the active arms compared with controls.

vascular endothelial function; deconditioning; ultrasound

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