Biomedical subjects

Kevin Power

Publications and source records attributed to Kevin Power.

7 recordsLinked to original sources

PubMed2007

Predicting treatment outcome on three measures for post-traumatic stress disorder.

The aim of the present study was to investigate predictors of treatment outcome for Posttraumatic Stress Disorder (PTSD) after treatment completion and at 15-months follow-up (n = 48), in a trial of Eye Movement Desensitisation and Reprocessing (EMDR) versus Imaginal Exposure and Cognitive Restructuring (E+CR). Factors associated with treatment outcome were investigated using regression analyses with the mean change scores in three assessor and self-rated PTSD symptomatology measures, including the Clinician-Administered PTSD Scale (CAPS), the Impact of Events Scale (IES) and the PTSD Symptom Checklist (PCL) from pre- to post-treatment and pre-treatment to follow-up as the dependent variables and demographics, trauma, clinical and personality measures as independent variables. Irrespective to outcome measures and assessment points it was found that four variables were able to predict significantly treatment outcome. These included baseline PTSD symptomatology, number of sessions, gender and therapy type. Overall, our results showed that it is difficult to use pre-treatment variables as a powerful and reliable tool for predicting treatment outcome, as significant predictors were found to be sample-specific and outcome measure-specific. Clinical relevance of the present results and directions for future research are discussed.

Adolescent↗

PubMed2006

Predicting general well-being from self-esteem and affectivity: an exploratory study with Scottish adolescents.

The present study investigated the association between the personality constructs of self-esteem/affectivity and General Well-Being (GWB) in Scottish adolescents. A total of 425 secondary school pupils completed the P.G.I. General Well-Being Scale [Verma et al. Ind J. Clin. Psychol. 10 (1983) 299], the Hare Self-esteem Scale (HSES) [Hare, The Hare General and Area-Specific (School, Peer, and Home) Self-esteem Scale. Unpublished manuscript, Department of Sociology, SUNY Stony Brook, New York, mineo, 1985] and the Positive and Negative Affect Schedule (PANAS) [Watson et al. J Personal Soc Psychol 54 (1988a) 1063]. Combined self-esteem, positive and negative affectivity, age and gender accounted for 49.7% of the total GWB variance, 24.9% of the physical well-being variance, 41.6% of the mood/affect well-being variance, 33.3% of the anxiety well-being variance and 44.3% of the self/others well-being variance. Home self-esteem was found the strongest predictor of mood/affect and self/others well-being domains as well as well-being total. It was also the second best predictor of anxiety well-being domain. School self-esteem was the strongest predictor of physical well-being, whereas negative affectivity was the strongest predictor of anxiety well-being domain. However age and gender were not significantly associated with GWB, total or domain specific. The study adds to previous evidence regarding the high association between GWB and personality factors in adult and adolescent populations. Directions for future research are discussed.

Adolescent↗

PubMed2006

The impact of knowledge and social influences on adolescents' breast-feeding beliefs and intentions.

OBJECTIVES: Many health promotion educational interventions assume that increasing knowledge directly influences beliefs, intentions and behaviour, whereas research suggests that knowledge alone is insufficient for behavioural change. Social cognition frameworks such as the Theory of Reasoned Action propose a central role for beliefs and social normative influences. This Scottish study evaluates the role of knowledge and social influences (subjective norms, exposure to breast-feeding, social barriers) on beliefs and future intentions to breast-feed or bottle-feed. Social influences from family and peers are investigated. DESIGN: A cross-sectional between-subjects observational design was used. A questionnaire was administered to a sample of 229 (46%) male and 267 (54%) female adolescents aged 11-18 years. SETTING: Participants completed questionnaires during lessons at three secondary schools in Central Scotland. RESULTS: Knowledge about health benefits of breast-feeding was generally poor. Analyses found that perceived social barriers to breast-feeding moderated the relationship between knowledge and beliefs. More knowledge, positive beliefs and supportive subjective norms also predicted future intentions to breast-feed. Parental norms exerted greater influence than peer norms on adolescents' breast-feeding beliefs. CONCLUSIONS: Knowledge and social influences are important predictors of positive breast-feeding beliefs and future intentions to breast-feed in adolescents. This has important implications for breast-feeding health promotion interventions in young people.

Adolescent↗

PubMed2006

Early intervention for relapse in schizophrenia: impact of cognitive behavioural therapy on negative beliefs about psychosis and self-esteem.

OBJECTIVES: The study aimed to test two hypotheses. Firstly, that participants who relapsed during the 12-month follow-up period of our randomized controlled trial, would show increased negative beliefs about their illness and reduced self-esteem, in comparison to the non-relapsed participants. Secondly, that cognitive behavioural therapy (CBT) for early signs of relapse would result in a reduction in negative beliefs about psychosis and an improvement in self-esteem at 12 months. DESIGN AND METHODS: A total of 144 participants with schizophrenia or a related disorder were randomized to receive either treatment as usual (TAU; N=72) or CBT (N=72). Participants completed the Personal Beliefs about Illness Questionnaire (PBIQ; Birchwood, Mason, MacMillan, & Healy, 1993) and the Rosenberg Self-Esteem Scale (RSES; Rosenberg, 1965) at entry, 3 months, 6 months, and 12 months. RESULTS: At 12 months, relapsers showed greater increase in scores for PBIQ entrapment compared with non-relapsers. In addition, after controlling for baseline covariates (treatment group and PBIQ self versus illness), relapsers also showed greater increase in scores for PBIQ self versus illness at 12 months. Furthermore, in comparison to treatment as usual, participants who received CBT showed greater improvement in PBIQ loss and in Rosenberg self-esteem. CONCLUSIONS: The study provides evidence that relapse is associated with the development of negative appraisals of entrapment and self-blame (self vs. illness). In addition, this is the first study to show that CBT reduces negative appraisals of loss arising from psychosis and improvements in self-esteem. Implications for future research and treatment are discussed.

Adolescent↗

PubMed2004

An acute bout of static stretching: effects on force and jumping performance.

INTRODUCTION/PURPOSE: The objectives of this study were to examine whether a static stretching (SS) routine decreased isometric force, muscle activation, and jump power while improving range of motion (ROM). Second, the study attempted to compare the duration of the dependent variable changes with the duration of the change in ROM. METHODS: Twelve participants were tested pre- and post- (POST, 30, 60, 90, and 120 min) SS of the quadriceps and plantar flexors (PF) or a similar period of no stretch (control). Measurements during isometric contractions included maximal voluntary force (MVC), evoked contractile properties (peak twitch and tetanus), surface integrated electromyographic (iEMG) activity of the agonist and antagonistic muscle groups, and muscle inactivation as measured by the interpolated twitch technique (ITT). Vertical jump (VJ) measurements included unilateral concentric-only (no countermovement) jump height as well as drop jump height and contact time. ROM associated with seated hip flexion, prone hip extension, and plantar flexion-dorsiflexion was also recorded. RESULTS: After SS, there were significant overall 9.5% and 5.4% decrements in the torque or force of the quadriceps for MVC and ITT, respectively. Force remained significantly decreased for 120 min (10.4%), paralleling significant percentage increases (6%) in sit and reach ROM (120 min). After SS, there were no significant changes in jump performance or PF measures. CONCLUSION: The parallel duration of changes in ROM and quadriceps isometric force might suggest an association between stretch-induced changes in muscle compliance and isometric force output.

Adult↗

PubMed2004

Effect of acute static stretching on force, balance, reaction time, and movement time.

PURPOSE: The purpose of the study was to investigate the effect of an acute bout of lower limb static stretching on balance, proprioception, reaction, and movement time. METHODS: Sixteen subjects were tested before and after both a static stretching of the quadriceps, hamstrings, and plantar flexors or a similar duration control condition. The stretching protocol involved a 5-min cycle warm-up followed by three stretches to the point of discomfort of 45 s each with 15-s rest periods for each muscle group. Measurements included maximal voluntary isometric contraction (MVC) force of the leg extensors, static balance using a computerized wobble board, reaction and movement time of the dominant lower limb, and the ability to match 30% and 50% MVC forces with and without visual feedback. RESULTS: There were no significant differences in the decrease in MVC between the stretch and control conditions or in the ability to match submaximal forces. However, there was a significant (P < 0.009) decrease in balance scores with the stretch (decreasing 9.2%) compared with the control (increasing 17.3%) condition. Similarly, decreases in reaction (5.8%) and movement (5.7%) time with the control condition differed significantly (P < 0.01) from the stretch-induced increases of 4.0% and 1.9%, respectively. CONCLUSION: In conclusion, it appears that an acute bout of stretching impaired the warm-up effect achieved under control conditions with balance and reaction/movement time.

Adult↗

PubMedDate not supplied

Negative beliefs about self and illness: a comparison of individuals with psychosis with or without comorbid social anxiety disorder.

OBJECTIVE: This study set out to investigate whether socially anxious individuals with psychosis will perceive more loss, entrapment, shame and humiliation, will blame themselves more for their illness and have lower self-esteem than non-socially anxious individuals with psychosis. METHOD: Two groups of participants with psychosis with (n=19) and without (n=19) social anxiety disorder were matched on the basis of gender and diagnosis. RESULTS: There were no differences between the two groups in terms of positive and negative symptoms. Participants with social anxiety had significantly higher levels of self-blame, entrapment, shame and lower self-esteem. Differences in entrapment, shame and self-esteem remained significant after controlling for depression. CONCLUSIONS: Negative beliefs about self and psychosis may be associated with the development of concurrent social anxiety disorder. The clinical and research implications of the findings are discussed.

Adolescent↗