Master of Science (MS)
The aim of this study was to test short-term and long-term reliability of venous outflow (VO) indices using the venous occlusion plethysmography technique. A secondary purpose was to compare venous measures to age, gender and various anthropometrical measures. The study group consisted of apparently healthy males and females, aged 18 to 80 years. Venous indices were under measures on two occasions (1 week apart), under the conditions of rest and following 5 min of upper arm occlusion. Venous outflow measures were calculated from the area under the curve (AUC) as well as the plethysmographic curve technique at the time .5 (VO.5), 2 (VO2) and the time interval between .5-2 seconds (VO.5-2). Venous capacitance (VC) was calculated by measuring the distance in mm from the baseline to the maximum height of the inflow curve and dividing this distance by the height of the calibration mark. Intraclass correlation coefficient (ICC) revealed higher within-day reliability than one-week reliability for markers: ICC’s = .931 vs. .622, .948 vs. .709, .965 vs. .518, and .971 vs. .431 for VC, VO.5, VO2 and VO.5-2, respectively. One-week reliability for these measures following occlusion were: ICC’s = .562, .701, .646 and .639 for all indices. Pearson correlation revealed associations between VO.5 and VO2 with arm length (R= -.344, p< .09; R= -.430, p< .03), respectively. Age was associated with VO.5-2 (R = -.340, p< .10). In addition, there were gender differences in VC (p< .009). Finally, a stepwise regression analysis was performed showing significant predictive value of venous measures, with respect to body size, in arm length (F= 4.979, p< .03) and gender (F= 7.862, p< .01). Short-term VO measures showed stronger reliability than long-term measures. Additionally, it appears that vessel length and gender have an important influence on venous outflow.
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Ortego, Jennifer Pitre, "One-week stability of forearm venous outflow as assessed by venous occlusion plethysmography" (2002). LSU Master's Theses. 3802.
Robert H. Wood