<p> A slow concentric contraction of the tibialis anterior muscle was imaged using Brightness-Mode Ultrasonography (BMU) from different probe orientations to determine the effect of probe orientation on the measurement of muscle architecture parameters (MAP). Nine contractions were performed by each of nine subjects. Each contraction was visualized with a different probe orientation on the anterior surface of the muscle. Data was taken from the same four joint angles from all contractions from all subjects and then compared for values of torque, tibialis anterior EMG and measures of MAP which include; fascicle length (FL), pennation angle (PA) and muscle thickness (MT).</p> <p> The results of an analysis of variance found a significant difference between joint angles for measures of FL and PA but not MT. A significant difference was found between probe rotations for the measures of FL and MT but not PA.</p> <p> A reliability study was performed for measures of MAP and found the coefficient of variation for FL and PA to be less than 8% both with and without the use of an image filter. The coefficient of variation for MT was found to be less than 2% which shows this
measure to be highly reliable.</p> <p> Equations and Figures were developed, corresponding to the observations and assumptions made by MAP researchers using BMU, to predict the effect of probe orientation on the measures of MAP.</p> <p> The results of this study indicate that ultrasound probe orientation affects measures of MAP but the effect either cannot be predicted from a simple geometric model or the error in the measurement technique does not allow this type of comparison. Specific guidelines are outlined in this paper to determine the proper probe placement and orientation to measure MAP using BMU for the tibialis anterior muscle.</p> / Thesis / Master of Science (MSc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/22610 |
| Date | 06 1900 |
| Creators | Klimstra, Marc |
| Contributors | Dowling, James J., Human Biodynamics |
| Source Sets | McMaster University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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