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Featured researches published by Grimes Ke.


International Journal of Psychophysiology | 2017

Repetitive head impacts do not affect postural control following a competitive athletic season

Nicholas G. Murray; Grimes Ke; Eric D. Shiflett; Barry A. Munkasy; Nathan R. D'Amico; Megan E. Mormile; Douglas W. Powell; Thomas A. Buckley

Evidence suggests that Repetitive Head Impacts (RHI) directly influence the brain over the course of a single contact collision season yet do not significantly impact a players performance on the standard clinical concussion assessment battery. The purpose of this study was to investigate changes in static postural control after a season of RHI in Division I football athletes using more sensitive measures of postural control as compared to a non-head contact sports. Fourteen Division I football players (CON) (age=20.4±1.12years) and fourteen non-contact athletes (NON) (2 male, 11 female; age=19.85±1.21years) completed a single trial of two minutes of eyes open quiet upright stance on a force platform (1000Hz) prior to athletic participation (PRE) and at the end of the athletic season (POST). All CON athletes wore helmets outfitted with Head Impact Telemetry (HIT) sensors and total number of RHI and linear accelerations forces of each RHI were recorded. Center of pressure root mean square (RMS), peak excursion velocity (PEV), and sample entropy (SampEn) in the anteroposterior (AP) and mediolateral (ML) directions were calculated. CON group experienced 649.5±496.8 mean number of impacts, 27.1±3.0 mean linear accelerations, with ≈1% of total player impacts exceeded 98g over the course of the season. There were no significant interactions for group x time RMS in the AP (p=0.434) and ML (p=0.114) directions, PEV in the AP (p=0.262) and ML (p=0.977) directions, and SampEn in the AP (p=0.499) and ML (p=0.984) directions. In addition, no significant interactions for group were observed for RMS in the AP (p=0.105) and ML (p=0.272) directions, PEV in the AP (p=0.081) and ML (p=0.143) directions, and SampEn in the AP (p=0.583) and ML (p=0.129) directions. These results suggest that over the course of a single competitive season, RHI do not negatively impact postural control even when measured with sensitive non-linear metrics.


Clinical Biomechanics | 2017

ASB clinical biomechanics award winner 2016: Assessment of gaze stability within 24–48 hours post-concussion

Nicholas G. Murray; Nathan R. D'Amico; Douglas W. Powell; Megan E. Mormile; Grimes Ke; Barry A. Munkasy; Russell K. Gore; Rebecca J. Reed-Jones

Background Approximately 90% of athletes with concussion experience a certain degree of visual system dysfunction immediately post‐concussion. Of these abnormalities, gaze stability deficits are denoted as among the most common. Little research quantitatively explores these variables post‐concussion. As such, the purpose of this study was to investigate and compare gaze stability between a control group of healthy non‐injured athletes and a group of athletes with concussions 24–48 hours post‐injury. Methods Ten collegiate NCAA Division I athletes with concussions and ten healthy control collegiate athletes completed two trials of a sport‐like antisaccade postural control task, the Wii Fit Soccer Heading Game. During play all participants were instructed to minimize gaze deviations away from a central fixed area. Athletes with concussions were assessed within 24–48 post‐concussion while healthy control data were collected during pre‐season athletic screening. Raw ocular point of gaze coordinates were tracked with a monocular eye tracking device (240 Hz) and motion capture during the postural task to determine the instantaneous gaze coordinates. This data was exported and analyzed using a custom algorithm. Independent t‐tests analyzed gaze resultant distance, prosaccade errors, mean vertical velocity, and mean horizontal velocity. Findings Athletes with concussions had significantly greater gaze resultant distance (p = 0.006), prosaccade errors (p < 0.001), and horizontal velocity (p = 0.029) when compared to healthy controls. Interpretation These data suggest that athletes with concussions had less control of gaze during play of the Wii Fit Soccer Heading Game. This could indicate a gaze stability deficit via potentially reduced cortical inhibition that is present within 24–48 hours post‐concussion. HighlightsGaze stability was assessed immediately post‐concussion during a antisaccade task.Raw ocular point of gaze coordinates were tracked with an eye tracking device.Prosaccade errors and mean horizontal velocity were significantly elevated.Data suggests potential gaze stability deficits immediately post‐concussion.Results could indicate reduced cortical inhibition post‐concussion.


Medicine and Science in Sports and Exercise | 2016

Relationship Between Position, Cumulative Impacts And Cumulative Accelerations In Ncaa Division I Football Players: 1922 Board #74 June 2, 3: 30 PM - 5: 00 PM.

Grimes Ke; Shiflett Ed; Barry A. Munkasy; Ake Km; D'Amico Nr; Megan E. Mormile; Powell Dw; Thomas A. Buckley; Nicholas G. Murray


Medicine and Science in Sports and Exercise | 2016

Repetitive Head Impacts Influence On The Postural Control System During An Athletic Season: 1920 Board #72 June 2, 3: 30 PM - 5: 00 PM.

Nicholas G. Murray; Shiflett Ed; Barry A. Munkasy; Grimes Ke; Ake Ke; D'Amico Nr; Megan E. Mormile; Powell Dw; Thomas A. Buckley


Archive | 2017

Diagnostic Validity of Static and Dynamic Postural Assessments Within 24-48 Hours Post-Concussion

Brian Szekely; Nicholas G. Murray; Megan E. Mormile; Grimes Ke; Jingjing Yin; Powell Dw


Medicine and Science in Sports and Exercise | 2017

The Relationship Between Post-Concussion Neurocognitive Performance and Postural Control: 2913 Board #5 June 2 1

Grimes Ke; Emily Lasko; Megan E. Mormile; Brian Szekely; Barry A. Munkasy; Douglas W. Powell; Nicholas G. Murray


Medicine and Science in Sports and Exercise | 2017

Postural and Gaze Stability Deficits Following Concussion: 2916 Board #8 June 2 1

Nicholas G. Murray; Brian Szekely; Megan E. Mormile; Peter Chrysosferidis; Grimes Ke; Barry A. Munkasy; Douglas W. Powell


Medicine and Science in Sports and Exercise | 2017

Gaze Stability of Visually Trained and Non-Visually Trained Athletes During a Sport-Like Postural Task: 3630 Board #77 June 3 9

Brian Szekely; Megan E. Mormile; Peter Chrysosferidis; Grimes Ke; Brian J. Mizeski; Barry A. Munkasy; Douglas W. Powell; Nicholas G. Murray


Medicine and Science in Sports and Exercise | 2017

Test-Retest Reliability of Multiple Postural Control Assessment Measures: 1132 Board #311 May 31 3

Megan E. Mormile; Brian Szekely; Grimes Ke; Brian J. Mizeski; Barry A. Munkasy; Douglas W. Powell; Nicholas G. Murray


Medicine and Science in Sports and Exercise | 2017

Postural And Cognitive Changes Observed During Re-Baseline Assessments: 2330 Board #343 June 1 3

Brian J. Mizeski; Megan E. Mormile; Brian Szekely; Grimes Ke; Barry A. Munkasy; Douglas W. Powell; Nicholas G. Murray

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Megan E. Mormile

Georgia Southern University

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Nicholas G. Murray

Georgia Southern University

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Barry A. Munkasy

Georgia Southern University

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Powell Dw

University of Memphis

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Brian Szekely

Georgia Southern University

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Rebecca J. Reed-Jones

University of Texas at El Paso

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Eric D. Shiflett

Georgia Southern University

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