Table 1 |
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Descriptive statistics | |||||||||
Standard shoes | Orthopaedic shoes | ||||||||
N = 25 | A. Mean | (SD) | Confidence interval | B. Mean | (SD) | Confidence interval | Relative change | T-test (p) | |
Step frequency (Hz) | 1.76 | (0.18) | 1.69–1.82 | 1.76 | (0.17) | 1.70–1.82 | 0.0% | 0.51 | |
ML | 0.70 | (0.15) | 0.64–0.76 | 0.63 | (0.10) | 0.59–0.67 | -10% | 0.00 | |
Dynamic stability (λ*) | V | 0.71 | (0.14) | 0.65–0.76 | 0.65 | (0.11) | 0.60–0.69 | -9% | 0.03 |
AP | 0.64 | (0.15) | 0.58–0.70 | 0.60 | (0.08) | 0.56–0.63 | -7% | 0.04 |
Values are expressed as mean (N = 25), Standard Deviation (SD) and 95% Confidence Interval (mean ±1.96 times the Standard Error of the Mean). Relative change is the average percentage of change induced by orthopaedic shoes (i.e. column B minus column A divided by column A). The t-test column shows the p values of paired t-tests. Step frequency is the number of steps per second (walking cadence). Dynamic stability is defined as the logarithmic rate of divergence in the acceleration signals (finite time Lyapunov exponent, λ^{*}). ML, V and AP stand for respectively Medio-Lateral, Vertical and Antero-posterior accelerations, i.e. the 3 axes measured by the triaxial accelerometer.
Terrier et al.
Terrier et al. BMC Musculoskeletal Disorders 2013 14:94 doi:10.1186/1471-2474-14-94