Adolescent physical activity levels: discrepancies with accelerometer data analysis

This study investigated the effects of epoch length and cut point selection on adolescent physical activity intensity quantification using vertical axis and vector magnitude (VM) measurement with the ActiGraph GT3X+ accelerometer. Four hundred and nine adolescents (211 males; 198 females) aged 12–16 years of age wore accelerometers during waking hours. The GT3X+ acceleration counts were reintegrated into 1, 5, 15, 30 and 60 s epoch lengths for both vertical axis and VM counts. One cut point was applied to vertical axis counts and three different cut points were applied to VM counts for each epoch length. Significant differences (P < 0.01) in mean total counts per day were observed between vertical axis and VM counts, and between epoch lengths for VM only. Differences in physical activity levels were observed between vertical and VM cut points, and between epoch lengths across all activity intensities. Our findings illustrate the magnitude of differences in physical activity outcomes that occur between axis measurement, cut points and epoch length. The magnitude of difference across epoch length must be considered in the interpretation of accelerometer data and seen as a confounding variable when comparing physical activity levels between studies.     

Effects of increasing and decreasing physiological arousal on anticipation timing performance during competition and practice

The aim of this study was to investigate if the effects of changes in physiological arousal on timing performance can be accurately predicted by the catastrophe model. Eighteen young adults (8 males, 10 females) volunteered to participate in the study following ethical approval. After familiarisation, coincidence anticipation was measured using the Bassin Anticipation Timer under four incremental exercise conditions: Increasing exercise intensity and low cognitive anxiety, increasing exercise intensity and high cognitive anxiety, decreasing exercise intensity and low cognitive anxiety and decreasing exercise intensity and high cognitive anxiety. Incremental exercise was performed on a treadmill at intensities of 30%, 50%, 70% and 90% heart rate reserve (HRR) respectively. Ratings of cognitive anxiety were taken at each intensity using the Mental Readiness Form 3 (MRF3) followed by performance of coincidence anticipation trials at speeds of 3 and 8 mph. Results indicated significant condition × intensity interactions for absolute error (AE; p = .0001) and MRF cognitive anxiety intensity scores (p = .05). Post hoc analysis indicated that there were no statistically significant differences in AE across exercise intensities in low–cognitive anxiety conditions. In high–cognitive anxiety conditions, timing performance AE was significantly poorer and cognitive anxiety higher at 90% HRR, compared to the other exercise intensities. There was no difference in timing responses at 90% HRR during competitive trials, irrespective of whether exercise intensity was increasing or decreasing. This study suggests that anticipation timing performance is negatively affected when physiological arousal and cognitive anxiety are high.     

The Mediation of Spectator Sport

Abstract

This study employs the theory of “media logic” and the method of hermeneutical criticism to demonstrate some effects of a major social institution, television, on the “text” of experiencing spectator sports. The study finds that the medium of television makes spectator sports into an experience which incorporates narrative, intimacy, commodification, and rigid time segmentation. The conventions imposed by television on spectator sports are presented here as powerfully affecting the meanings which televised sports have for their audiences.     

Virtual Communities: Bowling Alone,Online Together

First Lesson in Speech Improvement. By Birmingham &; Krapp, Charles Scribner's Sons, 1922.

Expression in Speech and Writing. By Lamborn, E. A., Greening. The Oxford Press. 1922. Pp. 120.

Classical rhetoric

Quintilian's Institutes of Oratory. Translated by H. E. Butler. Vols. III and IV. Loeb Classical Library. New York, Putnam's, 1922.

A Study in Greek Rhetoric. The Stylistic Infuence of the Second Sophistic On the Panegyrical Sermons of St. John Chrysostom. By Thomas E. Ameringer.‐ Catholic University of America, Washington, 1921.     

The University: Industry Interface in the Generation of Intellectual Property

This involves effective relations with the corporate sector, within an adaptive, evolving, bargaining framework. Based on an extensive interview programme, this paper explores the nature of that relationship in the context of the organisation and objectives of both partners and in the light of the developing competitive environment. It identifies the key elements on which bargaining tends to be focused and, in the light of organisational and market analysis which is ultimately developed into a bargaining model, offers predictions as to the likely outcomes of the bargaining.     

Psychometric properties of the Add Health School Connectedness Scale for 18 sociocultural groups

The National Longitudinal Study of Adolescent Health's School Connectedness Scale (SCS) has been widely used in psychological, public health, and education research, but has undergone limited psychometric analysis. This study used the responses of 500,800 junior and senior high school students who completed the biennial California Healthy Kids Survey, which includes the SCS. The results supported the use of the SCS as a unidimensional measure and showed that it has acceptable reliability (α = .82 to .88) and concurrent validity (r = .44 to .55) across 18 sociocultural groups. A series of multiple group analyses confirmed configural, metric, and scalar equivalence across groups. The SCS shows promise as measurement instrument for school psychologists; however, further research is needed to examine its underlying latent school connectedness construct. © 2011 Wiley Periodicals, Inc.