1,721,130 research outputs found
Headache does not predict sideline neurostatus or balance in high school football players
No full textHeadache Does Not Predict Sideline Neurostatus or Balance in High School Football Players
Van Boxtel BA, Nohren MW, Sabin MJ, Wessels K, Broglio SP: University of Illinois at Urbana-Champaign, Urbana-Champaign, IL
Context: Headache is reported to be the most common concussion related symptom. This has resulted in a heavy reliance on symptoms for the sideline assessment of concussive injuries. It is unclear however, if all athletes reporting headache demonstrate impairment in other commonly evaluated concussion domains. Objective: To determine the relationship between those with and without a headache resulting from football participation on neurostatus and balance. Design: A two group repeated-measures design. Setting: Three high schools in central Illinois. Participants: Varsity football athletes (N=32; age 16.3±0.8 years, range 16-18; weight 82.8±21.8 kg; height 177.0±7.5 cm), participated in this study. Interventions: All athletes completed a baseline evaluation of the Graded Symptom Checklist (GSC), Balance Error Scoring System (BESS) and Standardized Assessment of Concussion (SAC). Athletes reporting a headache (n=16) following a game or practice were re-administered the same test battery, as well control participants (non-headache: n=16) matched for age, playing position, weight and height. Main Outcome Measures: Performance on the GSC, BESS and SAC were evaluated using group by time repeated measures analysis of variance. Significance was noted when p0.05). Conclusions: Performance on common concussion assessment tools does not appear to be influenced by athlete reports of football related headache. These findings indicate that the use of headache, exclusively or in combination with other concussion related symptoms, is not a valid marker of the injury. This supports previous works suggesting clinicians should adopt a multifaceted approach to concussion management. Further, physical exertion appears to have an effect on BESS performance independent of symptoms, suggesting careful interpretation of BESS scores when administered on the sideline.Item withdrawn by Mark Zulauf ([email protected]) on 2010-04-30T19:46:14Z
Item was in collections:
University of Illinois Theses & Dissertations (ID: 1)
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The effect of subconcussive blows on fine motor control
No full textConcussion has been shown to cause immediate impairment in motor control. However, the effect of subconcussive blows is much more controversial. The clinically accepted recovery time from concussion is 7-10 days. However, recent studies involving EEG and complex motor tasks have revealed deficits up to 12 years post injury. Several studies have shown cognitive deficits associated with subconcussive blows while other studies have shown there are no ill effects. Few studies have examined the effect of subconcussive blows on motor function. PURPOSE: To further elucidate the effect of subconcussive blows on fine motor control. METHODS: Twenty athletes (age 20.7 ± 2.76) and twenty non-athletes (age 21.5 ± 2.26) with no history of concussion or contact sports, were recruited from NCAA Division-I sports teams, university club teams, and student population. All subjects completed a Purdue pegboard task, finger tapping task and an isometric force control task. Group differences in test performance were assessed using a t-test and a 3-way ANOVA with repeated measures. RESULTS: Data analysis revealed differences in between athletes and non-athletes in the finger tapping test. Non-athletes 2nd highest, 3rd highest, and average tapping scores were higher than those of athletes (p=.023, p=.008, and p=.019 respectively). Three way ANOVA with repeated measures revealed that non-athletes outperformed athletes at 2 levels of visual gain, 128 and 512 pixels/N (p=.045 and p=.009 respectively). No other significant between group’s differences were found. CONCLUSION: There are differences in fine motor control between athletes and non-athletes. Non-athletes displayed better finger quickness and slightly better isometric force control, outperforming athletes on the tapping test and isometric force control test respectively. There was no difference in finger dexterity as performances on the Purdue peg board test were equal. Athletes are at higher risk for head injury than non-athletes and several of these athletes may have sustained a concussion and not reported it. Finger speed and isometric force control may be more affected than manual dexterity or perhaps those tasks were simply more difficult. Further study involving data collected from athletes with and without history of concussion is necessary to further elucidate the effects of subconcussive blows on fine motor control.Item withdrawn by Mark Zulauf ([email protected]) on 2011-07-21T21:14:24Z
Item was in collections:
University of Illinois Theses & Dissertations (ID: 1)
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The long term effects of concussion on fine motor control
No full textConcussion has been shown to cause immediate impairment in neurocognitive function and motor control. A widely accepted recovery time from concussion is 7-10 days. However, late life health issues and evidence of chronic inflammatory scar tissue buildup in the brain have been linked to repeated head trauma. In recent electrophysiological studies, concussed individuals have shown differences in EEG profile up to 30 years post-injury. Few studies have examined the long term effects of concussion on persistent brain function. PURPOSE: To examine the persisting effects of concussion history on fine motor control. METHODS: Twenty individuals (age 20.4 +/-1.7) with no history of concussion and twenty individuals (age 20 +/-1.6) with at least 1 previous episode of concussion, were recruited from a NCAA Division-I football team. Participants each completed a Purdue pegboard task, finger tapping task and a submaximal isometric force control task. Group differences in test performance were assessed using a t-test and a 3-way ANOVA with repeated measures. Correlation analysis was used to assess relationships between test performance and concussion history. RESULTS: Data analysis showed no significant group differences between concussed and non-concussed individuals (p’s >0.05) on all measures. No significant relationships were seen between test performance and concussion history. CONCLUSION: There was no relation between concussion history and fine motor control performance as evaluated by these tasks. These results contrast the postural control and gait studies which indicated long term changes in concussed individuals. It is unclear why these changes occur, but the presence of sub-concussive blows or greater cortical allocation to fine motor movements are possible explanations. Further study is needed to further understand the long term effects of concussion on fine motor control.Item withdrawn by Mark Zulauf ([email protected]) on 2010-07-19T18:25:36Z
Item was in collections:
University of Illinois Theses & Dissertations (ID: 1)
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The chronic effects of concussion on gait
No full textConcussion has a well-defined, acute effect on motor control with alterations in gait documented up to thirty days post injury. There is a dearth of research examining the chronic effects of concussion on gait. The purpose of this investigation was to examine the effects of concussion in the gait patterns of young adults with and without a history of concussion during single and dual task paradigms. Individuals with (n=28, mean 6.32 years post injury) and without (n=40) a concussion history completed a battery of gait conditions during single and dual-task conditions. Normalized velocity, step length, stride width, number correct from cognitive task, time in single leg stance, and time in double leg stance were the variables of interest. Gait was analyzed using a GAITRite Electronic Walkway system and the Brooks visuospatial cognitive task was used to index cognition. Data analysis was assessed with multiple two-way, repeated measures ANOVAs and correlation analyses. The current investigation found that individuals with a history of concussion spent significantly greater time in double leg stance, significantly decreased time in single leg stance and had slower gait velocity. There was also a significant negative correlation between number of concussions and time in single leg stance and a positive correlation between number of concussions and time in double leg stance double stance percent. These findings suggest that individuals with a history of concussion adopt a more conservative gait strategy, perhaps to reduce the risk of further injury.Item withdrawn by Mark Zulauf ([email protected]) on 2010-04-12T18:29:17Z
Item was in collections:
University of Illinois Theses & Dissertations (ID: 1)
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Headache does not predict sideline neurostatus or balance in high school football players
No full textABSTRACT
Context: Headache is reported to be the most common concussion related symptom. This has resulted in a heavy reliance on symptoms for the sideline assessment of concussive injuries. It is unclear however, if all athletes reporting headache demonstrate impairment in other commonly evaluated concussion domains. Objective: To determine the relationship between those with and without a headache resulting from football participation on neurostatus and balance. Design: A two group repeated-measures design. Setting: Three high schools in central Illinois. Participants: Varsity football athletes (N=32; age 16.3±0.8 years, range 16-18; weight 82.8±21.8 kg; height 177.0±7.5 cm), participated in this study. Interventions: All athletes completed a baseline evaluation of the Graded Symptom Checklist (GSC), Balance Error Scoring System (BESS) and Standardized Assessment of Concussion (SAC). Athletes reporting a headache (n=16) following a game or practice were re-administered the same test battery, as well control participants (non-headache: n=16) matched for age, playing position, weight and height. Main Outcome Measures: Performance on the GSC, BESS and SAC were evaluated using group by time repeated measures analysis of variance. Significance was noted when p0.05). Conclusions: Performance on common concussion assessment tools does not appear to be influenced by athlete reports of football related headache. These findings indicate that the use of headache, exclusively or in combination with other concussion related symptoms, is not a valid marker of the injury. This supports previous works suggesting clinicians should adopt a multifaceted approach to concussion management. Further, physical exertion appears to have an effect on BESS performance independent of symptoms, suggesting careful interpretation of BESS scores when administered on the sideline.Item withdrawn by Mark Zulauf ([email protected]) on 2010-04-20T23:23:41Z
Item was in collections:
University of Illinois Theses & Dissertations (ID: 1)
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Long Term Effects of Concussion on Lifestyle
No full textis peer reviewedSubmitted by Tabitha Negrete ([email protected]) on 2011-05-07T21:16:00Z
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Previous issue date: 2011-05-0
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