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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