Interferential therapy effect on mechanical pain threshold and isometric torque after delayed onset muscle soreness induction in human hamstrings

This study was undertaken to examine the acute effect of interferential current on mechanical pain threshold and isometric peak torque after delayed onset muscle soreness induction in human hamstrings. Forty-one physically active healthy male volunteers aged 18-33 years were randomly assigned to one of two experimental groups: interferential current group (n = 21) or placebo group (n = 20). Both groups performed a bout of 100 isokinetic eccentric maximal voluntary contractions (10 sets of 10 repetitions) at an angular velocity of 1.05 rad · s(-1) (60° · s(-1)) to induce muscle soreness. On the next day, volunteers received either an interferential current or a placebo application. Treatment was applied for 30 minutes (4 kHz frequency; 125 μs pulse duration; 80-150 Hz bursts). Mechanical pain threshold and isometric peak torque were measured at four different time intervals: prior to induction of muscle soreness, immediately following muscle soreness induction, on the next day after muscle soreness induction, and immediately after the interferential current and placebo application. Both groups showed a reduction in isometric torque (P < 0.001) and pain threshold (P < 0.001) after the eccentric exercise. After treatment, only the interferential current group showed a significant increase in pain threshold (P = 0.002) with no changes in isometric torque. The results indicate that interferential current was effective in increasing hamstrings mechanical pain threshold after eccentric exercise, with no effect on isometric peak torque after treatment.     

Effects of replica running shoes upon external forces and muscle activity during running

Twelve participants ran (9 km · h(-1)) to test two types of running shoes: replica and original shoes. Ground reaction force, plantar pressure and electromyographic activity were recorded. The shoes were tested randomly and on different days. Comparisons between the two experimental conditions were made by analysis of variance (ANOVA) test (P ≤ 0.05). The time to first peak, loading rate of the first peak and impulse of the first 75 ms of stance were significantly different between the shoes (P ≤ 0.05), revealing an increase of impact forces for the replica shoes. The peak plantar pressure values were significantly higher (P ≤ 0.05) when wearing replica shoes. During running, the contact area was significantly smaller (P ≤ 0.05) for the replica shoe. The electromyographic activity of the analysed muscles did not show changes between the two shoes in running. These findings suggest that the use of replica running shoes can increase the external load applied to the human body, but may not change the muscle activity pattern during locomotion. This new mechanical situation may increase the risk of injuries in these movements.     

The association of child abuse and neglect with adult disability in schizophrenia and the prominent role of physical neglect

ObjectiveTo assess long-lasting effects of childhood trauma on the functional outcome of adult patients diagnosed with schizophrenia.MethodNinety-nine stable patients with schizophrenia followed in an outpatient program at a public university hospital in Porto Alegre, southern Brazil, were investigated for childhood traumatic experiences by the Childhood Trauma Questionnaire (CTQ) and for functional impairment by the World Health Organization Disability Assessment Schedule (WHO/DAS). The schizophrenia diagnosis was assessed by ICD-10 and DSM-IV criteria according to the Operational Criteria Checklist for Psychotic Illness (OPCRIT).ResultsChildhood trauma in general was associated with increased disability in adulthood, reflected by impaired Overall Behavior (p = .023) and Global Evaluation (p = .032). Analysis of specific traumatic domains revealed that increased childhood physical neglect was associated with functional impairment in Overall Behavior (p < .000), Social Role Performance (p = .037) and Global Evaluation (p = .014). Higher emotional abuse was associated with impaired Overall Behavior (p = .026), and higher emotional neglect with poor Global Evaluation (p = .047). Additionally, earlier onset of illness was associated with lower level of functioning evidenced by impairment in Overall Behavior (p = .042). Linear regression using WHO/DAS sections (Overall Behavior, Social Role Performance and Global Evaluation) as dependent variables and CTQ subscales indicated that only physical neglect had an effect on adult functionality.ConclusionsChildhood trauma was associated with functional and social impairment in adult patients with schizophrenia. Specific types of abuse and neglect, such as physical neglect and emotional abuse and neglect, influenced disability, and the most robust association was physical neglect. Studies involving more patients, with normal controls and additional measurements of biological liability, should be conducted to confirm this association and to increase the understanding of gene-environment relationship in schizophrenia and pathways to disability.Practice implicationsFurther investigation is warranted to clarify the association between childhood trauma and disability in schizophrenia, as well as to develop standardized instruments for the assessment of trauma and earlier detection of risk along with education of patients and families about adequate care, in an effort to reduce the incidence of disability in schizophrenia.     

Self-directed professional development – Hope for teachers working in deprived environments?

Self-direction has been identified as a potential key to the success of professional development of teachers, especially those working in deprived environments. This paper develops a model for self-directed professional development using interview data from 55 Zimbabwean A-level Science and Mathematics teachers. It focuses on teachers' decisions about using ICT in their own professional development. Grounded theory analysis suggests seven themes underlying such decisions making, in turn representing two major attractors of self-directed professional development. These were identified as classroom efficacy, i.e. the ability to teach effectively, and professional efficacy, i.e. the ability to relate effectively within the teaching profession. This paper explores the potential of using these attractors to stimulate self-directed professional development within formal professional development programmes especially in disadvantaged communities.     

Parameter estimation on linear time-varying systems

This paper studies parameter estimation for a class of linear, continuous, time-varying dynamic systems whose state-space model's matrices are affine combinations of static matrix coefficients and the aforementioned time-varying scalar parameters. It is assumed that the coefficient matrices are all known, that the state is mensurable, and that the parameters are bounded piecewise continuous functions of time. Estimation methods are developed from basic equations for a single parameter first, and later extended to multiple parameters.     

Excessively Long Editorial Decisions and Excessively Long Publication Times by Journals: Causes,Risks, Consequences,and Proposed Solutions

Editors have very complex tasks and high responsibilities. In general, they are chosen leaders and experts in a field of study. Thus, they are expected to lead a sector of that scientific community, and their function is to serve as gate-keepers of the quality of submissions to journals whose editorial boards they serve because of their ethical and professional image, and positive and open engagement with their peers. Publishing a scientific paper can be an arduous task and in some cases a lengthy one. However, any delay in this process not only serves as a form of stress for authors, it may also disadvantage them by giving their competition an unfair advantage with a head start in the publishing rat race. Consequently, editors who oversee a process that takes an excessive or unreasonable amount of time should be held accountable. In this paper, we propose some suggested time limits for each stage of the publishing process. These should be carefully monitored by the editors, in close collaboration with the publisher, to ensure a fair and timely process that is realistic and reasonable. With clearer guidelines, authors can thus reduce their stress levels by knowing when to expect decisions, and can thus make their journal selection by keeping such factors in mind, and thus hedge their risks and better manage their time. Authors who wait almost indefinitely, or for excessively long periods of time, are victims of a lack of professionalism. Furthermore, editors who fail to communicate delays, effectively or at all, or who fail to offer any sufficient or heartfelt apology should be characterized as acting with professional negligence, if not misconduct. Only when the rules of engagement are fair, strict, clear and well defined can authors expect the publishing system to progress smoothly and professionally.     

Motivational Factors and Predictors for Attending a Continuing Education Program for Older Adults

The objectives were to describe the stated motives of participants who enrolled in a program at the Open University for the Elderly (UnATI, in Portuguese), identify correlations between the stated motives and sociodemographic data, and find a set of predictors related to the listed motives. A total of 306 middle-aged and elderly adults aged 50 or older were surveyed through a sociodemographic questionnaire and a five-item scale to check their motives to enroll in the program. The following motivational factors were identified, in order of importance: enhancing general knowledge, investing in personal development, increasing social interaction, learning more in order to help others, and employing one's free time profitably. Age and years of schooling combined were strong predictors of participants seeking new knowledge. Being single and not retired was correlated with the motive Investing in Personal Development. Having attended elementary school only and being married was closely correlated to the motive Increasing Social Interaction. Employing One's Free Time Profitably was associated with single or widowed individuals with family income between 3.1 and 4.0 times the minimum wage. As for Learning More in Order to Help Others, no predictors were found for this motive. It was found that participants seek to satisfy a desire to learn/ know more, to be up-to-date, to exercise their rights as citizens, and to play an active role in society. Our data suggest that these are the assumptions that drive middle-aged and elderly adults to look for various types of educational programs.     

Information disclosure on MySpace – the what,the why and the implications

This paper reports the results of the first academic study of the use of a major social networking website, MySpace, by children. The study examined the degree of, and reasons for, information disclosure by children in high schools in Sydney, Australia. Social networking sites such as MySpace are a huge Internet phenomenon, some with hundreds of millions of users and often the most visited Internet sites on a daily basis. They are particularly attractive to, and used by, children, perhaps eclipsing email as a preferred communications medium. This study shows that, by and large, children are acting responsibly in embracing this new technology, however, there are a significant number potentially at risk, possibly due to their lacking individual personal privacy values. The paper concludes with a call for parents and teachers to become more familiar with social networking and to help their charges understand the implications of its use.