scholarly journals Trunk muscle coactivation is tuned to changes in task dynamics to improve responsiveness in a seated balance task

2015 ◽  
Vol 25 (5) ◽  
pp. 765-772 ◽  
Author(s):  
Nathalie M.C.W. Oomen ◽  
N. Peter Reeves ◽  
M. Cody Priess ◽  
Jaap H. van Dieën
Keyword(s):  
Trunk Muscle ◽  
Balance Task ◽  
Seated Balance

Determining Human Control Intent Using Inverse LQR Solutions

2013 ◽  
Author(s):  
M. Cody Priess ◽  
Jongeun Choi ◽  
Clark Radcliffe
Keyword(s):  
Human Subjects ◽  
Optimal Solution ◽  
Linear Matrix ◽  
Minimization Method ◽  
Human Control ◽  
Balance Task ◽  
Lqr Problem ◽  
Seated Balance ◽  
Gradient Based ◽  
Time Invariant

In this paper, we have developed a method for determining the control intention in human subjects during a prescribed motion task. Our method is based on the solution to the inverse LQR problem, which can be stated as: does a given controller K describe the solution to a time-invariant LQR problem, and if so, what weights Q and R produce K as the optimal solution? We describe an efficient Linear Matrix Inequality (LMI) method for determining a solution to the general case of this inverse LQR problem when both the weighting matrices Q and R are unknown. Additionally, we propose a gradient-based, least-squares minimization method that can be applied to approximate a solution in cases when the LMIs are infeasible. We develop a model for an upright seated-balance task which will be suitable for identification of human control intent once experimental data is available.

scholarly journals Analysis of trunk muscle EMG during rotational motion

2021 ◽  
Author(s):  
Nika Zolfaghari
Keyword(s):  
Rotational Motion ◽  
Muscle Activity ◽  
Trunk Muscle ◽  
Trunk Muscles ◽  
Wheelchair Users ◽  
Area Of Interest ◽  
Shoulder Muscles ◽  
Seated Balance ◽  
The Subject ◽  
Rotational Direction

The study of seated balance, specifically for the application of wheelchair users, has been an area of interest for quite some time. Unfortunately, most of the available studies to date have focused on upper limb and shoulder muscles, and little has been done analyzing the activity of trunk muscles (abdominal and back). For the purpose of this study, motorized rotational motion in the forward and backward directions at ±45 degrees was simulated, and the corresponding trunk muscle activity of nine healthy subjects was recorded by surface electromyography (EMG) for eight muscles, including an analysis on the effect of holding on to a harness for support, coupled with the presence of a visual input. The collected raw data was filtered, and the produced results illustrated that the muscle activity was greatest in the forward rotational direction, when the subject was holding on to a harness for support, with visuals present.

scholarly journals Analysis of trunk muscle EMG during rotational motion

2021 ◽  
Author(s):  
Nika Zolfaghari
Keyword(s):  
Rotational Motion ◽  
Muscle Activity ◽  
Trunk Muscle ◽  
Trunk Muscles ◽  
Wheelchair Users ◽  
Area Of Interest ◽  
Shoulder Muscles ◽  
Seated Balance ◽  
The Subject ◽  
Rotational Direction

The study of seated balance, specifically for the application of wheelchair users, has been an area of interest for quite some time. Unfortunately, most of the available studies to date have focused on upper limb and shoulder muscles, and little has been done analyzing the activity of trunk muscles (abdominal and back). For the purpose of this study, motorized rotational motion in the forward and backward directions at ±45 degrees was simulated, and the corresponding trunk muscle activity of nine healthy subjects was recorded by surface electromyography (EMG) for eight muscles, including an analysis on the effect of holding on to a harness for support, coupled with the presence of a visual input. The collected raw data was filtered, and the produced results illustrated that the muscle activity was greatest in the forward rotational direction, when the subject was holding on to a harness for support, with visuals present.

Trunk Muscle Activation During Balance Task. A Case Control Study Related To Age-CLBP Differences

2019 ◽  
Vol 100 (10) ◽  
pp. e137
Author(s):  
Rubens da Silva ◽  
Edgar Vieira ◽  
Guillaume Léonard ◽  
Louis-David Beaulieu ◽  
Suzy Ngomo ◽  
...  
Keyword(s):  
Muscle Activation ◽  
Case Control Study ◽  
Case Control ◽  
Trunk Muscle ◽  
Balance Task ◽  
Control Study

Age- and low back pain-related differences in trunk muscle activation during one-legged stance balance task

2019 ◽  
Vol 69 ◽  
pp. 25-30 ◽  
Author(s):  
Rubens A. da Silva ◽  
Edgar R. Vieira ◽  
Guillaume Léonard ◽  
Louis-David Beaulieu ◽  
Suzy Ngomo ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Muscle Activation ◽  
Trunk Muscle ◽  
Low Back ◽  
Balance Task

The Effects of Unicycle Exercise on Trunk Muscle Thickness

2019 ◽  
Vol 15 (2) ◽  
pp. 87-93
Author(s):  
Ah-young Choi ◽  
◽  
Chi-bok Park
Keyword(s):  
Muscle Thickness ◽  
Trunk Muscle

Effects of Lower-Extremity and Trunk Muscle Fatigue on Balance

2008 ◽  
Vol 2 (1) ◽  
pp. 16-22 ◽  
Author(s):  
Nuri Cetin ◽  
Meral Bayramoglu ◽  
Aydan Aytar ◽  
Ozgur Surenkok ◽  
Oya Umit Yemisci
Keyword(s):  
Lower Extremity ◽  
Muscle Fatigue ◽  
Trunk Muscle

Lumbopelvic Control and the Development of Upper Extremity Injury in Professional Baseball Pitchers

2021 ◽  
pp. 036354652098812
Author(s):  
Kevin Laudner ◽  
Regan Wong ◽  
Daniel Evans ◽  
Keith Meister
Keyword(s):  
Upper Extremity ◽  
Lower Limbs ◽  
Group Differences ◽  
Professional Baseball ◽  
Extremity Injury ◽  
Level Of Evidence ◽  
Balance Task ◽  
Upper Extremity Injury ◽  
Baseball Pitchers ◽  
Extremity Injuries

Background: The baseball-throwing motion requires a sequential order of motions and forces initiating in the lower limbs and transferring through the trunk and ultimately to the upper extremity. Any disruption in this sequence can increase the forces placed on subsequent segments. No research has examined if baseball pitchers with less lumbopelvic control are more likely to develop upper extremity injury than pitchers with more control. Purpose: To determine if baseball pitchers who sustain a chronic upper extremity injury have less lumbopelvic control before their injury compared with a group of pitchers who do not sustain an injury. Study Design: Cohort study; Level of evidence, 2. Methods: A total of 49 asymptomatic, professional baseball pitchers from a single Major League Baseball organization participated. Lumbopelvic control was measured using an iPod-based digital level secured to a Velcro belt around each player’s waist to measure anteroposterior (AP) and mediolateral (ML) deviations (degrees) during single-leg balance with movement and static bridge maneuvers. During a competitive season, 22 of these pitchers developed upper extremity injuries, while the remaining 27 sustained no injuries. Separate 2-tailed t-tests were run to determine if there were significant differences in lumbopelvic control between groups ( P < .05). Results: There were no significant between-group differences for the stride leg (nondominant) during the bridge test in either the AP ( P = .79) or the ML ( P = .42) directions, or either direction during the drive leg bridge test ( P > .68). However, the injured group had significantly less lumbopelvic control than the noninjured group during stride leg balance in both the AP ( P = .03) and the ML ( P = .001) directions and for drive leg balance in both the AP ( P = .01) and the ML ( P = .04) directions. Conclusion: These results demonstrate that baseball pitchers with diminished lumbopelvic control, particularly during stride leg and drive leg single-leg balance with movement, had more upper extremity injuries than those with more control. Clinicians should consider evaluating lumbopelvic control in injury prevention protocols and provide appropriate exercises for restoring lumbopelvic control before returning athletes to competition after injury. Specific attention should be given to testing and exercises that mimic a single-limb balance task.

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