scholarly journals Visual Limit-Push Training Alters Movement Variability

2018 ◽  
Vol 65 (10) ◽  
pp. 2162-2167 ◽  
Author(s):  
Eyad Hajissa ◽  
Amit Shah ◽  
James L. Patton
Keyword(s):  
Movement Variability ◽  
Visual Limit

scholarly journals The Influence of Functional Flywheel Resistance Training on Movement Variability and Movement Velocity in Elite Rugby Players

2020 ◽  
Vol 11 ◽  
Author(s):  
Bruno Fernández-Valdés ◽  
Jaime Sampaio ◽  
Juliana Exel ◽  
Jacob González ◽  
Julio Tous-Fajardo ◽  
...  
Keyword(s):  
Resistance Training ◽  
Movement Variability ◽  
Movement Velocity ◽  
Rugby Players

Gait kinematics in Low Back Pain: A non-linear approach

2021 ◽  
pp. 1-8
Author(s):  
Christos Tsigkanos ◽  
Theano Demestiha ◽  
Chara Spiliopoulou ◽  
Georgios Tsigkanos
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Healthy Subjects ◽  
Infrared Camera ◽  
Low Back ◽  
Movement Variability ◽  
Optoelectronic System ◽  
Mean Values ◽  
Non Linear ◽  
Healthy Participants

BACKGROUND: Kinematic analysis has been a dominant tool for addressing the neuromuscular and proprioceptive alterations that occur in Low Back Pain (LBP) patients. Movement variability is a crucial component of this analysis. During the past years a promising approach appears to be the application of non-linear indices. OBJECTIVE: The aim of the study was to compare movement variability, as expressed mainly by non-linear indices, at the pelvis and lumbar between LBP patients and healthy participants during gait. METHODS: Sixteen (16) LBP patients and thirteen (13) healthy control subjects (non-athletes) participated in the study. Participants walked on a treadmill at different walking conditions while recorded by a 6-infrared camera optoelectronic system. Kinematic variability of pelvic and lumbar movement was analyzed using linear (standard deviation) and non-linear indices (Maximal Lyapunov Exponent – LyE and Approximate Entropy – ApEn). RESULTS: Healthy subjects were found to have significantly greater mean values than LBP patients at seven pelvic and lumbar components in LyE, ApEn and SD. Specifically, the calculated LyE at the pelvis during normal gait was proven to have a sensitivity of 92.3% and a specificity of 90% in the discrimination of healthy subjects from LBP patients. Female subjects presented with higher variability in gait measures than males. CONCLUSION: Healthy participants presented with higher movement variability in their kinematic behavior in comparison to LBP patients. Lower variability values may be partly explained by the attempt of LBP patients to avoid painful end of range of motion positions. In this perspective non-linear indices seem to relate to qualitive characteristics of movement that need to be taken into consideration during rehabilitation.

The relation between falls risk and movement variability in Parkinson’s disease

2021 ◽  
Author(s):  
Steven Morrison ◽  
Jacquelyn Moxey ◽  
Nick Reilly ◽  
Daniel M. Russell ◽  
Karen M. Thomas ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Movement Variability ◽  
Falls Risk

scholarly journals Creative Motor Actions As Emerging from Movement Variability

2017 ◽  
Vol 8 ◽  
Author(s):  
Dominic Orth ◽  
John van der Kamp ◽  
Daniel Memmert ◽  
Geert J. P. Savelsbergh
Keyword(s):  
Movement Variability ◽  
Motor Actions

Lip and Jaw Kinematics in Bilabial Stop Consonant Production

1997 ◽  
Vol 40 (4) ◽  
pp. 877-893 ◽  
Author(s):  
Anders Löfqvist ◽  
Vincent L. Gracco
Keyword(s):  
Control Strategy ◽  
High Velocity ◽  
Stop Consonant ◽  
Movement Variability ◽  
Upper Lip ◽  
Lower Lip ◽  
Vowel Context ◽  
Virtual Target ◽  
Contextual Variability ◽  
Consonant Voicing

This paper reports two experiments, each designed to clarify different aspects of bilabial stop consonant production. The first one examined events during the labial closure using kinematic recordings in combination with records of oral air pressure and force of labial contact. The results of this experiment suggested that the lips were moving at a high velocity when the oral closure occurred. They also indicated mechanical interactions between the lips during the closure, including tissue compression and the lower lip moving the upper lip upward. The second experiment studied patterns of upper and lower lip interactions, movement variability within and across speakers, and the effects on lip and jaw kinematics of stop consonant voicing and vowel context. Again, the results showed that the lips were moving at a high velocity at the onset of the oral closure. No consistent influences of stop consonant voicing were observed on lip and jaw kinematics in five subjects, nor on a derived measure of lip aperture. The overall results are compatible with the hypothesis that one target for the lips in bilabial stop production is a region of negative lip aperture. A negative lip aperture implies that to reach their virtual target, the lips would have to move beyond each other. Such a control strategy would ensure that the lips will form an air tight seal irrespective of any contextual variability in the onset positions of their closing movements.

Effects of Motor Skill Level and Speed on Movement Variability during Running

2021 ◽  
pp. 110680
Author(s):  
Wei Wang ◽  
Feng Qu ◽  
Shangxiao Li ◽  
Liduan Wang
Keyword(s):  
Motor Skill ◽  
Skill Level ◽  
Movement Variability

scholarly journals Postural Constraints on Movement Variability

2010 ◽  
Vol 104 (2) ◽  
pp. 1061-1067 ◽  
Author(s):  
Daniel R. Lametti ◽  
David J. Ostry
Keyword(s):  
Visual Display ◽  
Movement Direction ◽  
Control Mechanisms ◽  
Robotic Device ◽  
Movement Variability ◽  
Base Level ◽  
Limb Stiffness ◽  
Actual Movement ◽  
Visual Motor ◽  
Circular Target

Movements are inherently variable. When we move to a particular point in space, a cloud of final limb positions is observed around the target. Previously we noted that patterns of variability at the end of movement to a circular target were not circular, but instead reflected patterns of limb stiffness—in directions where limb stiffness was high, variability in end position was low, and vice versa. Here we examine the determinants of variability at movement end in more detail. To do this, we have subjects move the handle of a robotic device from different starting positions into a circular target. We use position servocontrolled displacements of the robot's handle to measure limb stiffness at the end of movement and we also record patterns of end position variability. To examine the effect of change in posture on movement variability, we use a visual motor transformation in which we change the limb configuration and also the actual movement target, while holding constant the visual display. We find that, regardless of movement direction, patterns of variability at the end of movement vary systematically with limb configuration and are also related to patterns of limb stiffness, which are likewise configuration dependent. The result suggests that postural configuration determines the base level of movement variability, on top of which control mechanisms can act to further alter variability.

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