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Athletes in contact sports sustain repetitive subconcussive head impacts in a brief window, yet neurophysiological sequelae from repetitive subconcussion remain unclear. This prospective longitudinal study examined a relationship between changes in plasma Tau protein levels and subconcussive impact kinematic data in 23 Division I collegiate football players during a series of pre-season practices. Plasma measures for Tau and S100β proteins, symptom scores, and near point of convergence were obtained at pre-season baseline and pre-/post-practices. During each practice, impact frequency and linear and rotational head accelerations were recorded via an accelerometer-embedded mouth guard. There were significant elevations in plasma Tau levels at all post-practice time-points, compared with those of pre-practice and baseline levels. However, the highest degree of elevation in plasma Tau was observed after the first practice, for which players sustained the lowest number of hits and magnitudes for these hits. Subconcussive impact exposure during practice (e.g., head impact frequency and magnitude) did not predict increased plasma Tau levels. Concussion history and years of football experience also were unrelated to changes in plasma Tau levels. Increases in plasma Tau levels were associated with increases in S100β levels only after the first practice. There were no significant associations between changes in Tau levels, symptom scores, or near point of convergence. These data suggest that the changes in levels of circulating Tau protein were independent of subconcussive head impact exposure, pointing to the possibility that other factors may have played roles in changes in plasma Tau levels.

The current study investigates whether repetitive subconcussive impacts cause changes in plasma S100β levels, and also tests the associations between S100β changes and frequency/magnitude of impacts sustained. This prospective study of 22 Division-I collegiate football players included baseline and pre-season practices (one helmet-only and four full-gear). Blood samples were obtained and assessed for S100β levels at baseline and pre- to post-practices; symptom scores were assessed at each time-point. An accelerometer-embedded mouthguard was employed to measure the number of impacts (hits), peak linear acceleration (PLA), and peak rotational acceleration (PRA). Because we observed a distinct gap in impact exposure (hits, PLA, and PRA), players were clustered into lower (n = 7) or higher (n = 15) impact groups based on the sum of impact kinematics from all five practices. S100β levels significantly changed across the study duration. Although S100β levels remained stable from baseline to all pre-practice values, statistically significant acute increases in S100β levels were observed in all post-practice measures compared with the respective pre-practice values (range: 133-246% in the overall sample). Greater number of hits, sum of PLA, and sum of PRA were significantly associated with greater acute increases in S100β levels. There were significant differences in head impact kinematics between lower and higher impact groups (hits, 6 vs. 43 [M

This study explored the extent to which student emotion management factors and normative orientation (belief that chat rooms have normative standards of conduct similar to face-to-face interaction) circumscribe the sending of hostile messages within electronic relay chat rooms on the Internet. A questionnaire survey collected data from 114 undergraduate and graduate students from a large university in southeastern Michigan. The results of the survey revealed statistically significant differences between African American and Caucasian chat room users in terms of how the emotion management factors of shame, guilt, and embarrassment affect communication. The normative orientation of the chat room users was shown to have an inverse relationship regarding the flaming messages between both ethnic groups. This article describes how these factors are influenced by gender and ethnicity/gender. Findings regarding the perceptions of racism within electronic chat rooms are also discussed.

This study explored influences that perceptions of new technology implementation and planning processes, and dimensions of organizational climate have on perceptions of new technology deployment effectiveness. It also examined the extent to which dimensions of organizational climate moderates the relationships among new technology implementation, planning, and new technology deployment effectiveness. Data for this study was collected from 100 employees within 6 different types of organizations that had recently installed new technology. The results of the study indicate that these factors do indeed influence new technology deployment effectiveness. Organizational climate was not shown to have a moderator affect.

Introduction. Cyberbullying has received a considerable amount of attention within the academic and public literature. However, very little if any cyberbullying research has been conducted among Arab American students. This current study explored the impact of cyberbullying among middle and high school Arab American students on their self-esteem and academic functioning. It further explored the extent to which levels of emotional intelligence moderated these relationships.Method. The population of this study consisted of 1,152 middle and high school students, grades 6 through 12 from four different charter schools in Wayne County in Michigan. These schools represented different ethnic groups, such as Arab Americans, African Americans, Hispanic and White.Results. The results of the study indicate that Arab Americans experience more cyberbullying than the other ethnic groups within the study. The data illustrates that cyberbullying has an expected negative effect on student self-esteem and academic functioning among the Arab American group. There were mixed findings among the other ethnic student groups.Discussion. The level of student emotional intelligence was shown to moderate the relationships between cyberbullying, self-esteem and academic functioning more-so among Arab Americans than for the African American and White American student groups. This finding informs school practitioners that it would be advantageous to develop programs that promote emotional intelligence among students.

This study attempted to determine the feasibility of conducting an organizational readiness assessment for a participatory management program for maintenance workers within a large passenger airline. Organizational readiness factors consisted of the motivation climate of the department, supervisory behaviors, and the employee's orientation to group problem-solving. The results of a questionnaire study among 73 line maintenance workers revealed that only the group orientation factors predicted employees’ willingness to participate in group process improvement programs. However, strong and statistically significant correlations were shown among the willingness to participate variable and employee job satisfaction. The study revealed that employee group orientation moderates the relationships between the independent and criterion factors. Results also revealed that the employee’s personality orientation moderates the relationships between the organizational factors and employees’ willingness to participate in group process improvement programs.