Description:
Agonist-antagonist paired set (APS) training refers to the coupling of agonist and antagonist exercises, performed in an alternating manner with rest intervals between each set. The purpose of this review is to identify the proposed benefits and possible underlying mechanisms of APS training and to suggest how APS training may be exploited. Furthermore, areas deserving of further research attention will be presented. This review will also suggest a common terminology (i.e., APS training) for describing training modalities that alternate agonist and antagonist exercises. Although somewhat equivocal, evidence exists supporting the use of APS as a means of enhancing short-term power measures. Evidence also exists suggesting APS training is an efficacious and efficient means of developing strength and power. Time-efficient methods of developing strength and power would have benefits for athletes and the general population. Athletes able to spend less time developing strength and power would have more time to devote to other aspects of performance or other unrelated tasks. The general population may be more willing to adhere to less time-consuming resistance training programs that offer similar results, as compared to more time-consuming programs. This review concludes that the practical applicability of APS training in terms of acute performance enhancement is limited. However, the use of APS training as an efficacious and time-effective method for developing strength and power may hold some merit.
Description:
Objective: To investigate changes in mental health and other needs, as well as clinical and diagnostic 'caseness', in a sample of adolescents over a 6-month period following entry into a Young Offenders Institution in the UK. Design: Prospective cohort study. Setting: One Young Offenders Institution between November 2006 and August 2009. Participants: 219 male adolescents aged 15-18 years (M=16.56; SD=0.6) were assessed at baseline (median=4; range 0-26 days following reception into custody) on the Salford Needs Assessment Schedule for Adolescents (SNASA) and Kiddie Schedule for Affective Disorders and Schizophrenia (K-SADS). Participants were then reassessed at 3-month and 6-month postbaseline to document any change in mental health. Results: Of the initial baseline sample, 132 were still in the study at 3-month postbaseline and 63 were still available for assessment at 6 months. There were no differences between those who were not available for assessment at the three key stages in terms of demographic and criminological data. Over time there was a general improvement in mental health. While the proportion of participants with a mental health need (SNASA) did not change over time, symptom severity as measured by the SNASA did reduce significantly. When we assessed diagnostic 'caseness' using the K-SADS, three young people showed significant mental health deterioration. Conclusions: In line with previous studies, we found that symptoms in prison generally improved over time. Prison may provide an opportunity for young people previously leading chaotic lifestyles to settle into a stable routine and engage with services; however, it is unclear if these would be maintained either within the prison or on release into the community.
Description:
Although several studies have demonstrated an association between the 7-repeat (7R) allele in the 48-bp variable number of tandem repeats (VNTRs) in the exon 3 at dopamine receptor D4 (DRD4) gene and attention-deficit/ hyperactivity disorder (ADHD), others failed to replicate this finding. In this study, a total of 786 individuals with ADHD were genotyped for DRD4 exon 3 VNTR. All 7R homozygous subjects were selected for VNTR re-sequencing. Subjects homozygous for the 4R allele were selected paired by age, ancestry and disorder subtypes in order to have a sample as homogeneous as possible with 7R/7R individuals. Using these criteria, 103 individuals (66 with ADHD and 37 control individuals) were further investigated. An excess of rare variants were observed in the 7R alleles of ADHD patient when compared with controls (P = 0.031). This difference was not observed in 4R allele. Furthermore, nucleotide changes that predict synonymous and non-synonymous substitutions were more common in the 7R sample (P = 0.008 for total substitutions and P = 0.043 for non-synonymous substitutions). In silico prediction of structural/functional alterations caused by these variants have also been observed. Our findings suggest that not only repeat length but also DNA sequence should be assessed to better understand the role of DRD4 exon 3 VNTR in ADHD genetic susceptibility.
Description:
Musculoskeletal injuries during military and sport-related training are common, costly, and potentially debilitating. There is a need to develop and implement evidence-based injury prevention strategies to reduce the burden of musculoskeletal injury. The lack of attention to implementation issues is a major factor limiting the ability to successfully reduce musculoskeletal injury rates using evidence-based injury prevention programs. This article proposes 7 steps that can be used to facilitate successful design and implementation of evidence-based injury prevention programs within the logical constraints of a real-world setting by identifying implementation barriers and associated solutions.
Description:
BACKGROUND: Health/fitness facilities are popular venues for physical activity, where increasingly more individuals at risk of cardiovascular events exercise to achieve positive health outcomes. The aim of our study was to analyze cardiac emergency preparedness in health/fitness facilities in Queensland, Australia. DESIGN: Cross-sectional survey of health/fitness facilities in Queensland. METHODS: A risk management questionnaire was administered over 7 months, July 2009 to January 2010, using an online or paper-based version. The data are presented as the proportion of survey respondents giving specific responses to questionnaire items related to cardiac emergency preparedness, especially the provision of automated external defibrillators (AEDs). RESULTS: Fifty-two health/fitness facility managers responded to the survey. Most of the surveyed facilities conducted pre-activity screening (92%). Of those with a written emergency plan (79%), only 37% physically rehearsed their emergency response systems at regular intervals. Ninety-five percent of the facilities had fitness employees with a current first aid/cardiopulmonary resuscitation certificate and training. Of the 10 (19%) facilities with an on-site AED, only 6 had staff qualified to use the AED in an emergency, and only 6 had the AED as part of a public access defibrillator program. CONCLUSION: This is the first study to report that cardiac emergency preparedness is not optimal in the health/fitness facilities in Australia. Development of policies and procedures for training health/fitness professionals in emergency procedures is needed to minimize the risk when exercise-induced cardiac events occur at health/fitness facilities.
Description:
Objective To examine the appropriateness of different statistical models in analysing falls count data. Methods Six count models (Poisson, negative binomial (NB), zero-inflated Poisson (ZIP), zero-inflated NB (ZINB), hurdle Poisson (HP) and hurdle NB (HNB)) were used to analyse falls count data. Empirical evaluation of the competing models was performed using model selection criteria and goodness-of-fit through simulation. Data used were from a prospective cohort study of women aged 40-80 years. Results Of the 465 women analysed, 330 (71%) did not fall at all. The analyses identified strong evidence of overdispersion in the falls data. The NB-based regression models (HNB, ZINB, NB) were better performed than the Poisson-based regression models (Poisson, ZIP, HP). Vuong tests favoured the HNB model over the NB and ZINB models and the NB model over the ZINB model. Model accuracy measures and Monte Carlo simulation of goodness-of-fit confirmed the lack of fit of the Poissonbased regression models and demonstrated the best fit for the HNB model with comparable good fit for the ZINB and NB models. Conclusions Falls count data consisting of a considerable number of zeros can be appropriately modelled by the NBbased regression models, with the HNB model offering he best fit. The evaluation procedure presented in this aper provides a defensible guideline to appropriately odel falls or similar count data with excess zeros.
Description:
Objective: To develop a new instrument (the Craniofacial Experiences Questionnaire, CFEQ) to measure both stressors and positive aspects of living with a craniofacial condition from adolescent and parent perspectives, and to examine its validity and reliability. A secondary aim was to explore experiences reported according to age, gender, and diagnosis. Design: Self-report and parent report questionnaires (CFEQ, Youth Self Report [YSR], Child Behavior Checklist [CBCL], Behavioral and Emotional Rating Scale [BERS]) were completed by adolescents with congenital craniofacial conditions and their parents. Participants: Fifty adolescents with craniofacial conditions and 55 of their parents. Results: Internal reliability of the stressor and positive aspects scales was acceptable (.81 to .92) but was lower for some stressor subscales (.50-.86). Higher stressor scale scores were related to poorer adjustment (CBCL r = .55, YSR r = .37). There were no consistent differences in the stressful or positive experiences of young people with craniofacial conditions according to gender or age. There were no differences in stressors reported according to diagnosis. Conclusions: The CFEQ shows promise as a clinical and research tool for investigating the stressors and positive experiences of young people with craniofacial conditions. Consistent with the literature on chronic pediatric conditions, there were few differences in experiences of young people according to diagnosis. Furthermore, the lack of gender or age differences supports the need for clinicians to comprehensively assess the experiences of young people regardless of demographic variables.