An empirical examination of detrended fluctuation analysis for gait data

Damouras, Sotirios; Chang, Matthew; Sejdić, Ervin; Chau, Tom

doi:10.1016/j.gaitpost.2009.12.002

Cited by 99 publications

(98 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…most studies used data series longer than 5 min, although Herman et al [3] used data series of 2 min). Damouras et al [137] studied the number of strides required, and recommended a minimum of 600 strides. After a data series has been created from a quantity, the data series in question is integrated first.…”

Section: Calculationmentioning

confidence: 99%

“…the residual variance) is calculated. This procedure was suggested to work best for n ranging from 16 to N/9 (with N being the length of the data series), to obtain the relationship between n and f (n) (where f (n) is the average residual variance for window size n; [137]). Typically, f(n) will increase with increasing n, and a linear relationship between f(n) and n on a log -log plot indicates the presence of power-law scaling.…”

Section: Calculationmentioning

confidence: 99%

See 1 more Smart Citation

Assessing the stability of human locomotion: a review of current measures

Bruijn

Meijer

Beek³

et al. 2013

J. R. Soc. Interface.

531

365

View full text Add to dashboard Cite

Falling poses a major threat to the steadily growing population of the elderly in modern-day society. A major challenge in the prevention of falls is the identification of individuals who are at risk of falling owing to an unstable gait. At present, several methods are available for estimating gait stability, each with its own advantages and disadvantages. In this paper, we review the currently available measures: the maximum Lyapunov exponent (l S and l L ), the maximum Floquet multiplier, variability measures, long-range correlations, extrapolated centre of mass, stabilizing and destabilizing forces, foot placement estimator, gait sensitivity norm and maximum allowableperturbation. We explain what these measures represent and how they are calculated, and we assess their validity, divided up into construct validity, predictive validity in simple models, convergent validity in experimental studies, and predictive validity in observational studies. We conclude that (i) the validity of variability measures and l S is best supported across all levels, (ii) the maximum Floquet multiplier and l L have good construct validity, but negative predictive validity in models, negative convergent validity and (for l L ) negative predictive validity in observational studies, (iii) long-range correlations lack construct validity and predictive validity in models and have negative convergent validity, and (iv) measures derived from perturbation experiments have good construct validity, but data are lacking on convergent validity in experimental studies and predictive validity in observational studies. In closing, directions for future research on dynamic gait stability are discussed.

show abstract

Section: Calculationmentioning

confidence: 99%

Section: Calculationmentioning

confidence: 99%

Assessing the stability of human locomotion: a review of current measures

Bruijn

Meijer

Beek³

et al. 2013

J. R. Soc. Interface.

531

365

View full text Add to dashboard Cite

show abstract

“…First, time series data were divided into individual steps based upon ankle marker position in the Y direction as described in [10]. Individual step data were then used to calculate stride lengths and stride durations for the final 8 min of the 10 min trial (average 412 AE 30 steps), and statistical persistence (a) of both was estimated through DFA following the algorithm described by [11]. Window sizes for DFA analysis ranged from 16 to n/9 (n = total number of steps per trial).…”

Section: Discussionmentioning

confidence: 99%

A single bout of resistance exercise does not affect nonlinear dynamics of lower extremity kinematics during treadmill walking

2011

View full text Add to dashboard Cite

“…De-trended fluctuation analysis (DFA) is used in order to estimate the scaling exponent, α , as described in previous studies (e.g., Chau (2001), Terrier et al (2005), Damouras et al (2010)). For each signal, α > 0.5 indicates the signal is statistically persistent; α = 0.5 indicates random, uncorrelated behavior (a.k.a.…”

Section: Methodsmentioning

confidence: 99%

The effects of listening to music or viewing television on human gait

Sejdić

Findlay

Merey

et al. 2013

Computers in Biology and Medicine

Self Cite

View full text Add to dashboard Cite

This paper presents a two-part study with walking conditions involving music and television (TV) to investigate their effects on human gait. In the first part, we observed seventeen able-bodied adults as they participated in three 15-minute walking trials: 1. without music, 2. with music and 3. without music again. In the second part, we observed fifteen able-bodied adults as they walked on a treadmill for fifteen minutes while watching 1. TV with sound 2. TV without sound and 3. TV with subtitles but no sound. Gait timing was recorded via bilateral heel sensors and center-of-mass accelerations were measured by tri-axial accelerometers. Measures of statistical persistence, dynamic stability and gait variability were calculated. Our results showed that none of the considered gait measures were statistically different when comparing music with no-music trials. Therefore, walking to music did not appear to affect intrinsic walking dynamics in the able-bodied adult population. However, stride interval variability and stride interval dynamics were significantly greater in the TV with sound walking condition when compared to the TV with subtitles condition. Treadmill walking while watching TV with subtitles alters intinsic gait dynamics but potentially offers greater gait stability.

show abstract

An empirical examination of detrended fluctuation analysis for gait data

Cited by 99 publications

References 22 publications

Assessing the stability of human locomotion: a review of current measures

Assessing the stability of human locomotion: a review of current measures

A single bout of resistance exercise does not affect nonlinear dynamics of lower extremity kinematics during treadmill walking

The effects of listening to music or viewing television on human gait

Contact Info

Product

Resources

About