Influence of recovery time on post-activation potentiation in professional rugby players

Following a bout of heavy resistance training, the muscle is in both a fatigued and potentiated state with subsequent muscle performance depending on the balance between these two factors. To date, there is no uniform agreement about the optimal acute recovery required between the heavy resistance training and subsequent muscle performance to gain performance benefits. The aim of the present study was to determine the recovery time required to observe enhanced muscle performance following a bout of heavy resistance training. Twenty professional rugby players performed a countermovement jump at baseline and approximately 15 s, 4, 8, 12, 16, 20, and 24 min after a bout of heavy resistance training (three sets of three repetitions at 87% one-repetition maximum squat). Power output, jump height, and peak rate of force development were determined for all countermovement jumps. Despite an initial decrease in countermovement jump performance after the heavy resistance training (P<0.001), participants' performance increased significantly following 8 min recovery (P<0.001) (i.e. jump height increased by 4.9%, s=3.0). The findings suggest that muscle performance during a countermovement jump can be markedly enhanced following bouts of heavy resistance training provided that adequate recovery (approximately 8 min) is allowed between the heavy resistance training and the explosive activity.     

Exploratory factor analysis of parent ratings of child and adolescent anxiety: A preliminary investigation

This study explored the factor structure of a parent rating scale designed for use in the assessment of child and adolescent anxiety. A total of 176 usable surveys were returned from parents of children in grades kindergarten through 11. Exploratory common factor analyses on the 29‐item scale suggested one second‐order factor yielding an internal consistency estimate of .93 which accounted for 70% of the covariance among items. © 1999 John Wiley & Sons, Inc.     

Comparative efficacy of active recovery and cold water immersion as post-match recovery interventions in elite youth soccer

ABSTRACT

The current study compared cold-water immersion (CWI) and active recovery (AR) to static stretching (SS) on muscle recovery post-competitive soccer matches in elite youth players (n = 15). In a controlled crossover design, participants played a total of nine competitive soccer games, comprising three 80 minute games for each intervention (SS, CWI and AR). Muscle oedema, creatine kinase (CK), countermovement jump performance (CMJA) and perceived muscle soreness (PMS) were assessed pre-, immediately post-, and 48 hours post-match and compared across time-intervals and between interventions. Following SS, all markers of muscle damage remained significantly elevated (P < 0.05) compared to baseline at 48 hours post-match. Following AR and CWI, CMJA returned to baseline at 48 hours post-match, whilst CK returned to baseline following CWI at 48 hours post-match only. Analysis between recovery interventions revealed a significant improvement in PMS (P < 0.05) at 48 hours post-match when comparing AR and CWI to SS, with no significant differences between AR and CWI observed (P > 0.05). Analysis of %change for CK and CMJA revealed significant improvements for AR and CWI compared to SS. The present study indicated both AR and CWI are beneficial recovery interventions for elite young soccer players following competitive soccer matches, of which were superior to SS.     

Building Bridges Between Criminal Justice and the Forensic Sciences to Create Forensic Studies Programs 1

The ever‐increasing role of the forensic sciences in the criminal justice system requires criminal justice educators to integrate the study of forensic science into a traditional social science curriculum. Yet, most professors in criminal justice lack forensic science expertise sufficient to meet the educational demands of the field, as it is intertwined with natural science disciplines, especially biology and chemistry. Accordingly, this paper advocates the formation of an interdisciplinary forensic studies program, including a discussion of need, curricular components, and overcoming potential obstacles.     

Communication,Relationships, and Religious Difference in the Northern Ireland Workplace: A Study of Private and Public Sector Organizations

Four large organizations, two each from the private and public sectors of the Northern Ireland economy, were selected for this study which, first, explored the effects of religion-based workforce difference on intergroup relationships, second, investigated the contribution of organizational sector to communicative differences, and third, gauged the effects of group-based negativity on the flow and distribution of functional information within the organization. Little evidence of intergroup conflict was found although employees expressed a desire for greater quantity and quality of outgroup contact. Significant differences between the private and public bodies emerged in this respect. Contrasts were consistent with general organizational differences typifying the sectors. Findings are discussed in relation to diversity management and the characteristics of organizational sectors.     

Kitchen Antics: The Importance of Humor and Maintaining Professionalism at Work

The role of humor in workplace organizing is examined through a year-long ethnography of a hotel kitchen. An institutional and communicative frame reveals how the chefs use everyday humor to make sense of and shape their labor processes and to maintain their professional autonomy and identity and to resist managerial control of their craft.