Thesis (Ph. D.)--University of Wisconsin, Milwaukee, 2002. / Includes bibliographical references (leaves 93-97).

Thesis (M.A.)--Western Michigan University, 2004. / Includes bibliographical references (leaves 20-21).

Thesis (M.S.)--Georgia Southern University, 2002. / Includes bibliographical references.

Thesis (M.S.)--University of North Dakota, 2005. / Includes bibliographical references (leaves 47-48). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.

Thesis (M.S.)--Dominican University of California, 2005. / Includes bibliographical references (leaves 35-37). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.

Thesis (M.S.)--University of North Dakota, 2005. / Includes bibliographical references (leaves 47-48).

Thesis (M.S.)--Georgia Southern University, 2002. / Includes bibliographical references. Also available online (PDF file) by a subscription to the set or by purchasing the individual file.

Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 137-146).

Objective: To extend previous research designs and examine cognitive performance up to 30 days postconcussion. Method: A prospective cohort design was used to examine 2000 athletes from 8 mid-Michigan area high schools to compare baseline neurocognitive performance with postconcussion neurocognitive performance. All concussed athletes were readministered the Immediate Post Assessment and Cognitive Test (ImPACT) at 2, 7, 14, 21, and 30 days postconcussion. Results: A total of 72 high school athletes (aged 15.8 ± 1.34 years) sustained a concussion. A significant within-subjects effect for reaction time (F = 10.01; P= 0.000), verbal memory (F = 3.05; P = 0.012), motor processing speed (F= 18.51; P = 0.000), and total symptoms following an injury (F= 16.45; P= 0.000) was found. Concussed athletes demonstrated a significant decrease in reaction time up to 14 days postconcussion (P = 0.001) compared with baseline reaction time. Reaction time returned to baseline levels at 21 days postinjury (P = 0.25). At 7 days postinjury, impairments in verbal memory (P= 0.003) and motor processing speed (P= 0.000) were documented and returned to baseline levels by 14 days postinjury. Concussed athletes self-reported significantly more symptoms at 2 days postconcussion (P = 0.000) and exhibited a resolution of symptoms by 7 days postinjury (P = 0.06). Conclusion: High school athletes could take up to 21 days to return to baseline levels for reaction time. These data support current recommendations for the conservative management of concussion in the high school athlete.

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