Velocity-Specific Coactivation and Neuromuscular Responses to Fatiguing, Reciprocal, Isokinetic, Forearm Flexion, and Extension Muscle Actions

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Tyler J. Neltner ◽  
John Paul V. Anders ◽  
Joshua L. Keller ◽  
Robert W. Smith ◽  
Terry J. Housh ◽  
...  
Keyword(s):  
Neuromuscular Responses ◽  
Muscle Actions ◽  
Flexion And Extension

scholarly journals Inter- and Intra-Individual Differences in EMG and MMG during Maximal, Bilateral, Dynamic Leg Extensions

Sports ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 175 ◽  
Author(s):  
John Paul V. Anders ◽  
Cory M. Smith ◽  
Joshua L. Keller ◽  
Ethan C. Hill ◽  
Terry J. Housh ◽  
...  
Keyword(s):  
Individual Differences ◽  
Repeated Measures ◽  
Polynomial Regression ◽  
Vastus Lateralis ◽  
Regression Analyses ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Leg Extension ◽  
Neuromuscular Responses ◽  
Muscle Actions

The purpose of this study was to compare the composite, inter-individual, and intra-individual differences in the patterns of responses for electromyographic (EMG) and mechanomyographic (MMG) amplitude (AMP) and mean power frequency (MPF) during fatiguing, maximal, bilateral, and isokinetic leg extension muscle actions. Thirteen recreationally active men (age = 21.7 ± 2.6 years; body mass = 79.8 ± 11.5 kg; height = 174.2 ± 12.7 cm) performed maximal, bilateral leg extensions at 180°·s−1 until the torque values dropped to 50% of peak torque for two consecutive repetitions. The EMG and MMG signals from the vastus lateralis (VL) muscles of both limbs were recorded. Four 2(Leg) × 19(time) repeated measures ANOVAs were conducted to examine mean differences for EMG AMP, EMG MPF, MMG AMP, and MMG MPF between limbs, and polynomial regression analyses were performed to identify the patterns of neuromuscular responses. The results indicated no significant differences between limbs for EMG AMP (p = 0.44), EMG MPF (p = 0.33), MMG AMP (p = 0.89), or MMG MPF (p = 0.52). Polynomial regression analyses demonstrated substantial inter-individual variability. Inferences made regarding the patterns of neuromuscular responses to fatiguing and bilateral muscle actions should be considered on a subject-by-subject basis.

Effects of Work-to-Rest Ratios on Peak Torque and Neuromuscular Responses during Submaximal, Isometric Muscle Actions.

2016 ◽  
Vol 48 ◽  
pp. 411
Author(s):  
Ethan C. Hill ◽  
Terry J. Housh ◽  
Cory M. Smith ◽  
Kristen C. Cochrane ◽  
Nathaniel D.M. Jenkins ◽  
...  
Keyword(s):  
Peak Torque ◽  
Neuromuscular Responses ◽  
Muscle Actions ◽  
Isometric Muscle

The effects of velocity on peak torque and neuromuscular responses during eccentric muscle actions

2016 ◽  
Vol 24 (1) ◽  
pp. 1-6
Author(s):  
Ethan C. Hill ◽  
Terry J. Housh ◽  
Clayton L. Camic ◽  
Nathaniel D.M. Jenkins ◽  
Cory M. Smith ◽  
...  
Keyword(s):  
Peak Torque ◽  
Neuromuscular Responses ◽  
Muscle Actions

Effects of Velocity on Peak Torque and Neuromuscular Responses during Repeated, Maximal, Eccentric Muscle Actions.

2015 ◽  
Vol 47 ◽  
pp. 322-323
Author(s):  
Ethan C. Hill ◽  
Clayton L. Camic ◽  
Terry J. Housh ◽  
Molly M. Monaghan ◽  
Nathaniel D.M. Jenkins ◽  
...  
Keyword(s):  
Peak Torque ◽  
Neuromuscular Responses ◽  
Muscle Actions

scholarly journals Muscle Contributions to L4-5 Joint Rotational Stiffness following Sudden Trunk Flexion and Extension Perturbations

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Joel A. Cort ◽  
James P. Dickey ◽  
Jim R. Potvin
Keyword(s):  
Feedback System ◽  
Erector Spinae ◽  
Joint Stability ◽  
Trunk Flexion ◽  
Rotational Stiffness ◽  
Robotic Platform ◽  
Neuromuscular Responses ◽  
Direction Awareness ◽  
Perturbation Direction ◽  
Flexion And Extension

The purpose of this study was to investigate the contribution of individual muscles (MJRSm) to total joint rotational stiffness (MJRST) about the lumbar spine's L4-5 joint prior to, and following, sudden dynamic flexion or extension perturbations to the trunk. We collected kinematic and surface electromyography (sEMG) data while subjects maintained a kneeling posture on a parallel robotic platform, with their pelvis constrained by a harness. The parallel robotic platform caused sudden inertial trunk flexion or extension perturbations, with and without the subjects being aware of the timing and direction. Prevoluntary muscle forces incorporating both short and medium latency neuromuscular responses contributed significantly to joint rotational stiffness, following both sudden trunk flexion and extension motions. MJRST did not change with perturbation direction awareness. The lumbar erector spinae were always the greatest contributor to MJRST. This indicates that the neuromuscular feedback system significantly contributed to MJRST, and this behaviour likely enhances joint stability following sudden trunk flexion and extension perturbations.

scholarly journals Sex- and Mode-specific Responses to Eccentric Muscle Fatigue

2018 ◽  
Vol 39 (12) ◽  
pp. 893-901
Author(s):  
Ethan Hill ◽  
Terry Housh ◽  
Cory Smith ◽  
Joshua Keller ◽  
Richard Schmidt ◽  
...  
Keyword(s):  
Blood Flow ◽  
Biceps Brachii ◽  
Control Strategies ◽  
Muscle Blood Flow ◽  
Peak Torque ◽  
Men And Women ◽  
Neuromuscular Responses ◽  
Specific Muscle ◽  
Fatiguing Exercise ◽  
Muscle Actions

AbstractThe primary purpose of the present investigation was to examine sex-related differences as a result of fatiguing eccentric muscle actions on torque, muscle blood flow, electromyography, and mechanomyography. Eighteen men and 18 women performed peak torque trials prior to (pretest), immediately after (posttest), and 5-min after (recovery) completing 50 submaximal (60% of eccentric peak torque), eccentric, isokinetic (180°·s −1) muscle actions of the elbow flexors. Electromyographic and mechanomyographic responses were simultaneously recorded from the biceps brachii muscle, and muscle blood flow was measured at pretest, posttest and recovery. There were sex- and mode-specific responses for torque, but there were no sex-specific muscle blood flow or neuromuscular responses. From pretest to posttest, torque decreased (80.0–88.2% of pretest) for both the men and women. At recovery concentric peak torque recovered to a greater extent in women (95.0% of pretest) than men (88.0% of pretest), while eccentric peak torque recovered to a greater extent in men (88.9% of pretest) than women (86.9% of pretest). The sex-specific torque responses were not associated with different motor control strategies or differences in the occlusion of muscle blood flow between the men and women. For both men and women, eccentric fatiguing exercise is manifested similarly during isometric muscle actions, but not during eccentric and concentric muscle actions.

Motion Analysis of the Cervical Spine

2004 ◽  
Vol 9 (5) ◽  
pp. 1-11
Author(s):  
Patrick R. Luers
Keyword(s):  
Cervical Spine ◽  
Intervertebral Disk ◽  
Radiographic Evaluation ◽  
Ligamentous Injury ◽  
Pattern Of Injury ◽  
Motion Segment ◽  
Single Pattern ◽  
Compensatory Motion ◽  
Loss Of Motion ◽  
Flexion And Extension

Abstract The AMA Guides to the Evaluation of Permanent Impairment (AMA Guides), Fifth Edition, defines a motion segment as “two adjacent vertebrae, the intervertebral disk, the apophyseal or facet joints, and ligamentous structures between the vertebrae.” The range of motion from segment to segment varies, and loss of motion segment integrity is defined as “an anteroposterior motion of one vertebra over another that is greater than 3.5 mm in the cervical spine, greater than 2.5 mm in the thoracic spine, and greater than 4.5 mm in the lumbar spine.” Multiple etiologies are associated with increased motion in the cervical spine; some are physiologic or compensatory and others are pathologic. The standard radiographic evaluation of instability and ligamentous injury in the cervical spine consists of lateral flexion and extension x-ray views, but no single pattern of injury is identified in whiplash injuries. Fluoroscopy or cineradiographic techniques may be more sensitive than other methods for evaluating subtle abnormal motion in the cervical spine. The increased motion thus detected then must be evaluated to determine whether it represents normal physiologic motion, normal compensatory motion, motion related to underlying degenerative disk and/or facet disease, or increased motion related to ligamentous injury. Imaging studies should be performed and interpreted as instructed in the AMA Guides.

Application Study on Finger Joint Motion in Rehabilitation Training

2014 ◽  
Vol 644-650 ◽  
pp. 879-883
Author(s):  
Jing Jing Yu
Keyword(s):  
Control Method ◽  
Finger Joint ◽  
Continuous Passive Motion ◽  
Joint Motion ◽  
Joint Movement ◽  
Rehabilitation Training ◽  
Angle Data ◽  
Finger Flexion ◽  
And Control ◽  
Flexion And Extension

In various forms of movement of finger rehabilitation training, Continuous Passive Motion (CPM) of single degree of freedom (1 DOF) has outstanding application value. Taking classic flexion and extension movement for instance, this study collected the joint angle data of finger flexion and extension motion by experiments and confirmed that the joint motion of finger are not independent of each other but there is certain rule. This paper studies the finger joint movement rule from qualitative and quantitative aspects, and the conclusion can guide the design of the mechanism and control method of finger rehabilitation training robot.

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