Repeated Measures Design

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Procedure This study was a semi-experimental study with a repeated-measures design. To start the experiment, the examinee wore the stretch pants and the standard Oxford shoes. Then reflective markers were attached to the subject and he was asked to walk with free-speed walking on the walkway during the test. After this preparation phase, the examinee walked along a three-meter walkway in six different subsets and data were collected. Each subset of trial with different conditions was repeated three times. A trial was considered successful if the subject's right foot landed on the force plate. In order to prevent fatigue and to have the same condition in all trials, the subjects took five-minute intervals between trials. Test conditions…show more content…
An α level of 0.05 was accepted as significant for all tests in this study. Results Table 2 shows the mean and standard deviation of coefficient of friction (COF), walking speed (WS), stride length (SL), stride duration (SD) and cadence in 6 different conditions of the test. Coefficient of friction Table 3 shows ANOVA (Tukey's post hoc) results of coefficient of friction on slippery and dry surfaces (p=0.014). Results depict that COF on dry surface was more than slippery surface. In addition, COF between the shoe and the contact surface would increase by increasing the groove depth of shoe sole on both dry and slippery floors (see fig. 2). The highest COF was related to the deepest tread groove (5.0 mm) on the dry surface. Walking velocity and cadence Table 4 shows Friedman analysis of walking speed (WS), stride length (SL) and stride duration (SD), and cadence on both slippery and dry surfaces. Results depict that there were no statistical difference among (WS), (SD), and cadence using different groove depths on dry and slippery surfaces (p≥0.05). It is necessary to mention that the highest SL was related to deepest tread groove (5.0 mm) on the dry surface. Discussion Coefficient of friction In our study COF (measured in the mid-stance phase of gait) was increased by‏ increasing groove depth of the shoe sole, so that the highest value of COF was correlated to the deepest groove depth (5.0 mm) on both
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