Table 1 Details on intrinsic variability of measures for 20 strides and reference imr calculated on long overground walks performed by a sample of healthy young subjects and use for analysis [20]
From: Are gait variability and stability measures influenced by directional changes?
Measures | Variability for 20 strides | imr | ||
|---|---|---|---|---|
Temporal variability measures | Standard deviation (SD) | 20-30% | 0,10 | |
Coefficient of variation (CV) | 30-40% | 0,10 | ||
Inconsistency of variance (IV) | > 50% | 0,20 | ||
Nonstationary index (NI) | > 50% | 0,24 | ||
Poincaré plots | PSD1 | 20-30% | 0,07 | |
PSD2 | 40-50% | 0,14 | ||
Stability measures | Short-term Lyapunov exponents (sLE) | tot | 20-30% | 0,26 |
AP | 10-20% | 0,20 | ||
ML | 10-20% | 0,18 | ||
V | 10-20% | 0,20 | ||
Long-term Lyapunov exponents (lLE) | tot | > 50% | 0,29 | |
AP | > 50% | 0,33 | ||
ML | > 50% | 0,30 | ||
V | > 50% | 0,22 | ||
Recurrence quantification analysis (RQA) | rr AP | < 10% | 0,01 | |
rr ML | < 10% | 0,01 | ||
rr V | < 10% | 0,02 | ||
det AP | 10-20% | 0,02 | ||
det ML | 10-20% | 0,03 | ||
det V | 10-20% | 0,01 | ||
avg AP | 10-20% | 0,03 | ||
avg ML | 10-20% | 0,02 | ||
avg V | 10-20% | 0,03 | ||
max AP | > 50% | 0,17 | ||
max ML | > 50% | 0,26 | ||
max V | > 50% | 0,42 | ||
diverg AP | > 50% | 0,27 | ||
diverg ML | > 50% | 0,23 | ||
diverg V | > 50% | 0,54 | ||
Multiscale entropy (MSE) | AP τ = 1 | 10-20% | 0,02 | |
AP τ = 2 | 10-20% | 0,03 | ||
AP τ = 3 | 10-20% | 0,03 | ||
AP τ = 4 | 10-20% | 0,03 | ||
AP τ = 5 | 10-20% | 0,03 | ||
AP τ = 6 | 10-20% | 0,03 | ||
ML τ = 1 | 10-20% | 0,02 | ||
ML τ = 2 | 10-20% | 0,03 | ||
ML τ = 3 | 10-20% | 0,03 | ||
ML τ = 4 | 10-20% | 0,03 | ||
ML τ = 5 | 10-20% | 0,03 | ||
ML τ = 6 | 10-20% | 0,03 | ||
V τ = 1 | 10-20% | 0,03 | ||
V τ = 2 | 10-20% | 0,03 | ||
V τ = 3 | 10-20% | 0,03 | ||
V τ = 4 | 10-20% | 0,04 | ||
V τ = 5 | 10-20% | 0,03 | ||
V τ = 6 | 10-20% | 0,04 | ||
Harmonic ratio (HR) | AP | 20-30% | 0,07 | |
ML | 20-30% | 0,06 | ||
V | 20-30% | 0,07 | ||
Index of harmonicity (IH) | AP | 40-50% | 0,20 | |
ML | 30-40% | 0,17 | ||
V | 30-40% | 0,21 |