Stride smoothness evaluation of runners and other athletes

Hreljac, Alan

doi:10.1016/s0966-6362(00)00045-x

Cited by 67 publications

(63 citation statements)

References 23 publications

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“…The third section (S3) extended from Landmark 2 until toe off of the initial stance limb as the COP translated anteriorly. During these three phases of gait initiation, five dependent variables were computed: a) displacement of the COP in the X direction; b) displacement of the COP in the Y direction; c) average velocity of the COP in the X direction; d) average velocity of the COP in the Y direction; and e) smoothness -defined as the integral of the 3rd time derivative squared of the COP trace in the X and Y directions (Hreljac, 2000). In this case, smaller calculated values represent greater smoothness and control.…”

Section: Landmarks and Periods Identified In The Gait Initiation Cyclementioning

confidence: 99%

“…Movement smoothness is often used to assess motor performance in both healthy and disabled subjects (Puniello et al, 2000, Platz et al, 1994, Rohrer et al, 2002, Hreljac, 2000. The meansquared jerk value during the movement has been reported as an index of smoothness with the assumption that minimizing this value is indicative of improved movement control (Platz et al, 1994, Puniello et al, 2000, Hass et al, 2004.…”

Section: Forward-oriented Gait Initiationmentioning

confidence: 99%

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Gait initiation in older adults with postural instability

Hass

Waddell

Wolf

et al. 2008

Clinical Biomechanics

101

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Section: Landmarks and Periods Identified In The Gait Initiation Cyclementioning

confidence: 99%

Section: Forward-oriented Gait Initiationmentioning

confidence: 99%

Gait initiation in older adults with postural instability

Hass

Waddell

Wolf

et al. 2008

Clinical Biomechanics

101

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“…Researchers have demonstrated a decrease in jerk metrics with training or expertise 644 (Hreljac, 1993(Hreljac, , 2000Schneider & Zernicke, 1989) and increased jerk metrics with increased gait speed when comparing walking and running (Hreljac, 2000 …”

mentioning

confidence: 99%

Biomechanical metrics of aesthetic perception in dance

Bronner

Shippen

2015

Exp Brain Res

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“…Schneider and Zernicke 8) showed that significantly less JC was observed in the slowest hand movements after subjects had practiced the movements. Hreljac [9][10][11] argued that smoothness of gait can be quantified by evaluating JC and that competitive runners tend to exhibit smoother strides than recreational runners during both running and fast walking. Also, examination of development of reaching movements among human infants showed increasingly rapid decrease of movement jerk with increasing age [12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation Parameters for Care-Giving Motions

et al. 2007

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Abstract. Quantitative evaluation parameters for care-giving motions were investigated by analyzing three-dimensional motion data of skilled and unskilled caregivers. Subjects were three skilled caregivers, each of whom had over 12 yrs of clinical experience, and four physical therapy students. We recorded a typical care-giving motion between a caregiver and a care-receiver three times for each caregiver/receiver pair with a 3-D motion analysis system (VICON system, Oxford Metrics, UK). We did time-series analyses to extract performance evaluation parameters from observed indexes such as trajectories, velocities, accelerations of the body's center of gravity (COG), jerk-cost, and impulse. The analyzed motion was lifting a patient lying on a bed into the sitting position. The skilled caregivers' operation times were shorter than those of the unskilled caregivers. The COG trajectories of skilled caregivers showed smoother and better reproducibility over the three trials, and the COG velocity curves showed a high single peak at start up. The jerk-cost and impulse of skilled caregivers were lower than those of unskilled caregivers. We found reproducibility and smoothness of movement to be good evaluation parameters for care-giving motions. The measurement indexes observed in this study should be introduced to improve evaluation of the education of unskilled caregivers.

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Stride smoothness evaluation of runners and other athletes

Cited by 67 publications

References 23 publications

Gait initiation in older adults with postural instability

Gait initiation in older adults with postural instability

Biomechanical metrics of aesthetic perception in dance

Evaluation Parameters for Care-Giving Motions

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