|Assessment of the forearm vascular changes during rhythmic hand gripping exercises by doppler ultrasound method
Hong Kong Polytechnic University -- Dissertations
Department of Rehabilitation Sciences
|xii, 61 leaves : ill. (some col.) ; 30 cm
|A study was carried out to measure the mean blood velocity (MBV) of the brachial artery during rhythmic hand gripping exercises by Doppler ultrasound. The purposes of the study were to investigate (1) the vascular changes during the course of these exercises and (2) the repeatability of the Doppler method in the measurement of the mean blood velocity during these exercises on two separate days. Thirty-one young normal volunteers performed ten trials of hand gripping at 10% and 30% of the maximal voluntary contraction force (MVC) on two separate days. Mean blood velocity of the following phases: (1) prior to the test; (2) during every alternate trial of the rhythmic exercise which included eight seconds of gripping and sixteen seconds of rest and (3) for two minutes after the test, were recorded by the "Medilink DP2000" hand-held Doppler. The blood flow through the brachial artery, when compared to rest, was found to increase by 30 % to 50% during the 10% MVC exercise and 200% to 300% during the 30% MVC exercise. At 10% MVC, there were no significant differences in MBV during the different trials of rhythmic hand gripping. This indicated that the steady blood supply to the forearm could fulfill the metabolic demand in the course of the ten trials of hand gripping. On the other hand, significant differences were found in MBV at various trials of the 30% MVC exercise. This showed that a gentle increase of blood supply was required to support the metabolic demand during the consecutive trials of the 30% MVC rhythmic hand gripping. For analysis of the day-to-day repeatability, statistical tests showed that there were no significant differences for the measurement of MBV on two separate days. However, analysis with Pearson's Correlation test found that the MBV measurement at the various phases of exercises had low to medium repeatability only. Measurement of MBV at rest had higher repeatability when compared to measurement taken during exercise. On the other hand, measurement of MBV at 10% MVC was more repeatable than those at 30% MVC. The low to medium repeatability of the MBV measurement on two separate days was probably due to the physiological changes or technical errors when using the Doppler. Therefore, a good control of the testing procedures and high familiarity with the Doppler measuring methodology are important for improving the repeatability and reliability of the blood flow measurement.
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