Table 1.
Details of 22 gait variables collected from the accelerometric gait analysis device.
| Short title | Full title | Units | Methods | Brief definition |
|---|---|---|---|---|
| SPEED | Speed | m/s | Regression model | Average linear speed of forward displacement |
| STRF | Stride frequency | Hz | Fast Fourier Transform | Number of walk cycles per unit of time |
| STRD | Stride duration | s | Time measure | Average duration between two successive ground contact of the same foot |
| STRL | Stride length | m | Speed/SF | Average length between two successive ground contact of the same foot |
| PWCC | Power in CC axis | W/kg | Fast Fourier Transform | Power extracted from the FFT spectrum in CC axis |
| PWAP | Power in AP axis | W/kg | Fast Fourier Transform | Power extracted from the FFT spectrum in AP axis |
| PWML | Power in ML axis | W/kg | Fast Fourier Transform | Power extracted from the FFT spectrum in ML axis |
| PW3AX | Total mechanical power on the 3 axes | W/kg | Combination | Sum of the 3 powers extracted from the FFT spectrum in CC, AP, LM axes |
| VO2 | Oxygen consumption estimate | ml/min/kg | Regression model | Estimation of oxygen consumption based on high correlations between VO2 and power and SF variables |
| SBV | Support and breaking vector | g | Vector calculation | Averaged vector of the first part of support phase (deceleration or breaking phase) |
| SPV | Support and propulsion vector | g | Vector calculation | Averaged vector of the second part of the support phase (propulsion) |
| UBG | Unloading and breaking vector | g | Vector calculation | Averaged vector during unloading and breaking phase |
| UBV | Unloading and propulsion vector | g | Vector calculation | Averaged vector during unloading and propulsion phase |
| SY1CC | Symmetry index 1 CC axis | Without | Autocorrelation | Comparison of the left and right acceleration patterns on CC axis (both acceleration amplitude and time on all the strides) |
| SY2CC | Symmetry index 2 CC axis | Without | Wavelet analysis+autocorrelation | Comparison of the left and right acceleration patterns on CC axis (both signal energy and time over all the sample) |
| SY3CC | Symmetry index 3 CC axis | Without | Wavelet analysis+autocorrelation | Comparison of the left and right acceleration patterns on CC axis (both signal energy and time on all the strides) |
| SYML | Symmetry index 4 ML axis | Without | Wavelet analysis+autocorrelation | Comparison of the left and right acceleration patterns on ML axis (both signal energy and time on all the strides) |
| SYAP | Symmetry index 2 AP axis | Without | Wavelet analysis+autocorrelation | Comparison of the left and right acceleration patterns on AP axis (both signal energy and time on all the strides) |
| REG1CC | Regularity index 1 CC axis | Without | Autocorrelation | Variability analysis of the pattern in successive strides of the sample by analysis of the acceleration patterns in CC axis |
| REG2CC | Regularity index 2 CC axis | Without | Wavelet analysis+autocorrelation | Variability analysis of the pattern in successive strides of the sample by analysis of the signal energy patterns in AP axis |
| CCAE | CC acceleration energy | J/ | Wavelet analysis | Total Energy of the wavelet spectrum on CC acceleration signal |
| HFSW | High frequency shock wave | % | Wavelet analysis | Percentage of the total energy due to high frequency >4Hz due to foot impacts and transient |