The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Jay Hertel - One of the best experts on this subject based on the ideXlab platform.
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variability in center of pressure position and muscle activation during walking with chronic ankle instability
Journal of Electromyography and Kinesiology, 2018Co-Authors: Rachel M Koldenhoven, Mark A Feger, John J Fraser, Jay HertelAbstract:Abstract Chronic ankle instability (CAI) patients exhibit altered gait mechanics. The objective was to identify differences in stride-to-stride variability in the position of the center of pressure (COP) and muscle activity during walking between individuals with and without CAI. Participants (17 CAI;17 Healthy) walked on a treadmill at 1.3 m/s while surface electromyography (sEMG) of the Fibularis longus (FL) and plantar pressure were recorded. The medial-lateral COP position was averaged for each 10% interval of stance and group standard deviations (SD), coefficient of variation (COV), and range for the COP position were compared between groups via independent t-tests. Ensemble curves for sEMG amplitude SD were graphed for the entire stride cycle to determine significant differences. The CAI group had increased COP position variability (SD (CAI = 0.79 ± 0.47 mm, Control = 0.48 ± 0.17 mm), COV (CAI = 1.47 ± 0.87 mm, Control = 0.93 ± 0.33 mm), range (CAI = 2.97 ± 2.07 mm, Control = 1.72 ± 0.33 mm, P
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Modulation of the Fibularis longus Hoffmann Reflex and Postural Instability Associated With Chronic Ankle Instability.
Journal of athletic training, 2016Co-Authors: Kyung Min Kim, Susan A. Saliba, Joseph M. Hart, Jay HertelAbstract:Context: Individuals with chronic ankle instability (CAI) present with decreased modulation of the Hoffmann reflex (H-reflex) from a simple to a more challenging task. The neural alteration is asso...
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relationships between self reported ankle function and modulation of hoffmann reflex in patients with chronic ankle instability
Physical Therapy in Sport, 2016Co-Authors: Kyung Min Kim, Susan A. Saliba, Joseph M. Hart, Jay HertelAbstract:Abstract Objective To examine relationships between self-reported ankle function and Hoffmann (H) reflex modulation during changes in body positions in patients with chronic ankle instability (CAI). Design Observational. Setting Laboratory. Participants Thirty-one young adults with CAI (19 males, 12 females) participated. Main outcome measures There were two subscales of Foot and Ankle Ability Measure (FAAM) to quantify self-reported ankle function during activities of daily living (ADL) and sports activities. Maximum H-reflexes (H-max) and motor waves (M-max) from soleus and Fibularis longus were recorded while participants lied prone and stood in bipedal and unipedal stances. For each muscle, percent change scores in H max :M max ratios were calculated between each pair of positions: prone-to-bipedal, bipedal-to-unipedal, and prone-to-unipedal, and used as a measure of H-reflex modulation. Pearson correlation coefficients were calculated between FAAM and H-reflex modulation measures. Results There were significant correlations between: (1) FAAM-ADL and soleus prone-to-unipedal modulation (r = 0.384, p = 0.04), (2) FAAM-Sport and soleus prone-to-unipedal modulation (r = 0.505, p = 0.005), (3) FAAM-Sport and fibular bipedal-to-unipedal modulation (r = 0.377, p = 0.05), and (4) FAAM-Sport and fibular prone-to-unipedal modulation (r = 0.396, p = 0.04). Conclusions CAI patients presented moderate, positive relationships between self-reported ankle function and H-reflex modulation during changes in body positions.
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influence of body position on Fibularis longus and soleus hoffmann reflexes
Gait & Posture, 2013Co-Authors: Kyung Min Kim, Joseph M. Hart, Jay HertelAbstract:It is widely accepted that Hoffmann (H) reflex amplitudes of the soleus decrease as complexity of body positions increases, but it is not known if this same mechanism of postural control is seen in other ankle muscles such as Fibularis longus (FL). Our purpose was to assess if FL H-reflex changed in different body positions and if the adaptations were correlated to soleus H-reflex modulation. Fifteen healthy subjects had their FL and soleus H-reflexes measured in three positions (prone, bipedal, unipedal). Maximal H-reflexes (H-max) and motor responses (M-max) were collected bilaterally. The average H-max and M-max were used to calculate H(max)/M(max) ratios. To control influences of background muscle activity on H-reflex measures, the ratios were normalized to their corresponding mean EMG amplitudes over a 50-ms time epoch. H-reflex amplitudes of both muscles were significantly lower in unipedal stance than other positions. Additionally, there were strong correlations (R(2)>0.7) in H-reflex modulation between the two muscles when transitioning from prone to either bipedal or unipedal stance. Down-modulation of H-reflex when transitioning to unipedal stance was present in both FL and soleus suggesting that H-reflex modulation of both muscles may play a similar role in control of upright posture.
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altered postural modulation of hoffmann reflex in the soleus and Fibularis longus associated with chronic ankle instability
Journal of Electromyography and Kinesiology, 2012Co-Authors: Kyung Min Kim, Christopher D Ingersoll, Jay HertelAbstract:Our purpose was to assess Hoffmann (H) reflex modulations of the soleus and Fibularis longus in three body positions (prone, bipedal and unipedal stances) in subjects with and without chronic ankle instability (CAI). Sixteen subjects with unilateral CAI and 15 healthy controls participated. Maximum H-reflexes and motor (M) waves were recorded bilaterally from the soleus and Fibularis longus while subjects lied prone and then stood in quiet bipedal and unipedal stances. Maximum H-reflexes were normalized to maximum M waves to obtain H(max):M(max) ratios for the three positions. H-reflex modulations, for each muscle, were quantified as the percent change scores in H(max):M(max) ratios between each pair of positions: prone to bipedal, bipedal to unipedal, and prone to unipedal. There were significant group by limb interactions found for all three modulations (P < 0.05) for the soleus. In the CAI group, soleus modulations in involved limbs were significantly lower than in uninvolved limbs and both limbs in the controls. For the Fibularis longus, similar results were found for the bipedal to unipedal and prone to unipedal modulations. Constrained ability of the sensorimotor system to down regulate H-reflex in more demanding postures may represent a potential mechanism of postural control deficits associated with CAI.
Fernando Ribeiro - One of the best experts on this subject based on the ideXlab platform.
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kinesiology taping does not change Fibularis longus latency time and postural sway
Journal of Bodywork and Movement Therapies, 2016Co-Authors: Christophe Correia, Susana Lopes, Rafael Goncalves, Rui Torres, Francisco Pinho, Pedro Wagner Goncalves, Mario Rodrigues, Rui Costa, Mario Lopes, Fernando RibeiroAbstract:Summary Background Kinesiology tape seems to improve muscle force, although little is known regarding its effect on latency time and postural sway. Objectives To examine the effects of kinesiology taping on Fibularis longus latency time and postural sway in healthy subjects. Methods Thirty participants were equally randomized into three groups, two experimental groups receiving kinesiology tape (EG1, from origin to insertion; EG2, from insertion to origin) and a control group. Before and 20-min after the intervention, postural sway was assessed on a force platform and Fibularis longus latency time was recorded with surface electromyography during a sudden inversion perturbation. Results At baseline, no differences were found between groups regarding age, anthropometrics variables, postural sway and Fibularis longus latency time. In both experimental groups, the application of tape did not change postural sway and Fibularis longus latency time (EG1: 93.7 ± 15.0 to 89.9 ± 15.6 ms; EG2, 81.24 ± 14.21 to 81.57 ± 16.64, p Conclusion Kinesiology tape seems not to enhance Fibularis longus reaction time and postural sway in young healthy subjects.
Kyung Min Kim - One of the best experts on this subject based on the ideXlab platform.
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Modulation of the Fibularis longus Hoffmann Reflex and Postural Instability Associated With Chronic Ankle Instability.
Journal of athletic training, 2016Co-Authors: Kyung Min Kim, Susan A. Saliba, Joseph M. Hart, Jay HertelAbstract:Context: Individuals with chronic ankle instability (CAI) present with decreased modulation of the Hoffmann reflex (H-reflex) from a simple to a more challenging task. The neural alteration is asso...
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relationships between self reported ankle function and modulation of hoffmann reflex in patients with chronic ankle instability
Physical Therapy in Sport, 2016Co-Authors: Kyung Min Kim, Susan A. Saliba, Joseph M. Hart, Jay HertelAbstract:Abstract Objective To examine relationships between self-reported ankle function and Hoffmann (H) reflex modulation during changes in body positions in patients with chronic ankle instability (CAI). Design Observational. Setting Laboratory. Participants Thirty-one young adults with CAI (19 males, 12 females) participated. Main outcome measures There were two subscales of Foot and Ankle Ability Measure (FAAM) to quantify self-reported ankle function during activities of daily living (ADL) and sports activities. Maximum H-reflexes (H-max) and motor waves (M-max) from soleus and Fibularis longus were recorded while participants lied prone and stood in bipedal and unipedal stances. For each muscle, percent change scores in H max :M max ratios were calculated between each pair of positions: prone-to-bipedal, bipedal-to-unipedal, and prone-to-unipedal, and used as a measure of H-reflex modulation. Pearson correlation coefficients were calculated between FAAM and H-reflex modulation measures. Results There were significant correlations between: (1) FAAM-ADL and soleus prone-to-unipedal modulation (r = 0.384, p = 0.04), (2) FAAM-Sport and soleus prone-to-unipedal modulation (r = 0.505, p = 0.005), (3) FAAM-Sport and fibular bipedal-to-unipedal modulation (r = 0.377, p = 0.05), and (4) FAAM-Sport and fibular prone-to-unipedal modulation (r = 0.396, p = 0.04). Conclusions CAI patients presented moderate, positive relationships between self-reported ankle function and H-reflex modulation during changes in body positions.
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influence of body position on Fibularis longus and soleus hoffmann reflexes
Gait & Posture, 2013Co-Authors: Kyung Min Kim, Joseph M. Hart, Jay HertelAbstract:It is widely accepted that Hoffmann (H) reflex amplitudes of the soleus decrease as complexity of body positions increases, but it is not known if this same mechanism of postural control is seen in other ankle muscles such as Fibularis longus (FL). Our purpose was to assess if FL H-reflex changed in different body positions and if the adaptations were correlated to soleus H-reflex modulation. Fifteen healthy subjects had their FL and soleus H-reflexes measured in three positions (prone, bipedal, unipedal). Maximal H-reflexes (H-max) and motor responses (M-max) were collected bilaterally. The average H-max and M-max were used to calculate H(max)/M(max) ratios. To control influences of background muscle activity on H-reflex measures, the ratios were normalized to their corresponding mean EMG amplitudes over a 50-ms time epoch. H-reflex amplitudes of both muscles were significantly lower in unipedal stance than other positions. Additionally, there were strong correlations (R(2)>0.7) in H-reflex modulation between the two muscles when transitioning from prone to either bipedal or unipedal stance. Down-modulation of H-reflex when transitioning to unipedal stance was present in both FL and soleus suggesting that H-reflex modulation of both muscles may play a similar role in control of upright posture.
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altered postural modulation of hoffmann reflex in the soleus and Fibularis longus associated with chronic ankle instability
Journal of Electromyography and Kinesiology, 2012Co-Authors: Kyung Min Kim, Christopher D Ingersoll, Jay HertelAbstract:Our purpose was to assess Hoffmann (H) reflex modulations of the soleus and Fibularis longus in three body positions (prone, bipedal and unipedal stances) in subjects with and without chronic ankle instability (CAI). Sixteen subjects with unilateral CAI and 15 healthy controls participated. Maximum H-reflexes and motor (M) waves were recorded bilaterally from the soleus and Fibularis longus while subjects lied prone and then stood in quiet bipedal and unipedal stances. Maximum H-reflexes were normalized to maximum M waves to obtain H(max):M(max) ratios for the three positions. H-reflex modulations, for each muscle, were quantified as the percent change scores in H(max):M(max) ratios between each pair of positions: prone to bipedal, bipedal to unipedal, and prone to unipedal. There were significant group by limb interactions found for all three modulations (P < 0.05) for the soleus. In the CAI group, soleus modulations in involved limbs were significantly lower than in uninvolved limbs and both limbs in the controls. For the Fibularis longus, similar results were found for the bipedal to unipedal and prone to unipedal modulations. Constrained ability of the sensorimotor system to down regulate H-reflex in more demanding postures may represent a potential mechanism of postural control deficits associated with CAI.
Christophe Correia - One of the best experts on this subject based on the ideXlab platform.
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kinesiology taping does not change Fibularis longus latency time and postural sway
Journal of Bodywork and Movement Therapies, 2016Co-Authors: Christophe Correia, Susana Lopes, Rafael Goncalves, Rui Torres, Francisco Pinho, Pedro Wagner Goncalves, Mario Rodrigues, Rui Costa, Mario Lopes, Fernando RibeiroAbstract:Summary Background Kinesiology tape seems to improve muscle force, although little is known regarding its effect on latency time and postural sway. Objectives To examine the effects of kinesiology taping on Fibularis longus latency time and postural sway in healthy subjects. Methods Thirty participants were equally randomized into three groups, two experimental groups receiving kinesiology tape (EG1, from origin to insertion; EG2, from insertion to origin) and a control group. Before and 20-min after the intervention, postural sway was assessed on a force platform and Fibularis longus latency time was recorded with surface electromyography during a sudden inversion perturbation. Results At baseline, no differences were found between groups regarding age, anthropometrics variables, postural sway and Fibularis longus latency time. In both experimental groups, the application of tape did not change postural sway and Fibularis longus latency time (EG1: 93.7 ± 15.0 to 89.9 ± 15.6 ms; EG2, 81.24 ± 14.21 to 81.57 ± 16.64, p Conclusion Kinesiology tape seems not to enhance Fibularis longus reaction time and postural sway in young healthy subjects.
Phillip A Gribble - One of the best experts on this subject based on the ideXlab platform.
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the immediate effects of an anterior to posterior talar mobilization on neural excitability dorsiflexion range of motion and dynamic balance in patients with chronic ankle instability
Journal of Sport Rehabilitation, 2014Co-Authors: Matthew S Harkey, Michelle M Mcleod, Ashley Van Scoit, Masafumi Terada, Michael A Tevald, Phillip A Gribble, Brian G PietrosimoneAbstract:Context: Altered neuromuscular function and decreased dorsiflexion range of motion (DFROM) have been observed in patients with chronic ankle instability (CAI). Joint mobilizations are indicated for restoring DFROM and dynamic postural control, yet it remains unknown if a mobilization can alter neuromuscular excitability in muscles surrounding the ankle. Objective: To determine the immediate effects of a Maitland grade III anterior-to-posterior joint mobilization on spinal-reflex and corticospinal excitability in the Fibularis longus (FL) and soleus (SOL), DFROM, and dynamic postural control. Design: Single-blinded randomized control trial. Setting: Research laboratory. Patients: 30 patients with CAI randomized into a mobilization (n = 15) or control (n = 15) group. Intervention: Maitland grade III anterior-to-posterior joint mobilization. Main Outcome Measures: Spinal-reflex excitability was measured with the Hoffmann reflex, while corticospinal excitability was evaluated with transcranial magnetic stimul...
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chronic ankle instability and corticomotor excitability of the Fibularis longus muscle
Journal of Athletic Training, 2012Co-Authors: Brian G Pietrosimone, Phillip A GribbleAbstract:Context: Neuromuscular deficits are common in people with chronic ankle instability (CAI). Corticomotor pathways are very influential in the production of voluntary muscle function, yet these pathw...