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PCA in studying coordination and variability: a tutorial.
OBJECTIVE To explain and underscore the use of principal component analysis in clinical biomechanics as an expedient, unbiased means for reducing high-dimensional data sets to a small number of modesExpand
Assessing the stability of human locomotion: a review of current measures
The validity of variability measures and λS is best supported across all levels and 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. Expand
Regularity of center-of-pressure trajectories depends on the amount of attention invested in postural control
It is indicated that regularity of COP trajectories is positively related to the amount of attention invested in postural control, but substantiate that in certain situations an increased internal focus may in fact be detrimental to posturalControl. Expand
Effects of chronic low back pain on trunk coordination and back muscle activity during walking: changes in motor control
The observed changes in trunk coordination and ES activity were a direct consequence of LBP per se, suggesting that conservative therapy should consider gait training as well as exercises aimed at improving both intersegmental and muscle coordination. Expand
Dynamical structure of center-of-pressure trajectories in patients recovering from stroke
The progressively less regular COP trajectories were interpreted to indicate a reduction of cognitive involvement in postural control as recovery from stroke progressed, and show a clear surplus value of dynamical measures in studying posturalcontrol. Expand
Statistical precision and sensitivity of measures of dynamic gait stability
Longer data series led to more precise estimates for lambda(S-stride), lambda(L- Stride), and MaxFm, and all variables showed an effect of data series length, which suggested that when estimating and comparing these variables across conditions, data series covering an equal number of strides should be analysed. Expand
Is slow walking more stable?
The absence of a consistent pattern of correlations between lambda(L-stride) and MeanSD over the three directions suggests that variability and stability reflect, at least to a degree, different properties of the dynamics of walking. Expand
Biomechanics of Competitive Front Crawl Swimming
Essential performance-determining factors in front crawl swimming can be analysed within a biomechanical framework, in reference to the physiological basis of performance, and drag in groups of elite swimmers homogeneous with respect to swimming technique is determined by anthropometric dimensions. Expand
Gait Coordination After Stroke: Benefits of Acoustically Paced Treadmill Walking
It is suggested that acoustically paced treadmill walking provides an effective means for immediately modifying stride frequency and improving gait coordination in people after stroke and may be usefully applied in physical therapist practice. Expand
Coordination Between Arm and Leg Movements During Locomotion
The coupling between all pairs of limb movements was found to increase with walking velocity, whereas no clear signs were observed that the switches from 2:1 to 1:1 frequency coordination and vice versa were preceded by loss of stability. Expand