Journal Articles
Published Research
The following is a summary of journal publications by Associate Professor Knowles. Click on the references below for further details.
Journal Articles
2013
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Knowles, S.R. & Mikocka-Walus, A. (2013) Utilization and efficacy of Internet-based eHealth technology in Gastroenterology: A systematic review. Scandinavian Journal of Gastroenterology, Vol. 49, no. 4, (Apr 2014), pp. 387-408. doi: 10.3109/00365521.2013.865259
Objective: While there have been several reviews exploring the outcomes of various eHealth studies, none have been gastroenterology-specific. This paper aims to evaluate the research conducted within gastroenterology which utilizes internet-based eHealth technology to promote physical and psychological well-being.
Material and methods: A systematic literature review of internet-based eHealth interventions involving gastroenterological cohorts was conducted. Searched databases included: EbSCOhost Medline, CINAHL, and PsycINFO. Inclusion criteria were studies reporting on eHealth interventions (both to manage mental health problems and somatic symptoms) in gastroenterology, with no time restrictions. Exclusion criteria were non-experimental studies, or studies using only email as primary eHealth method, and studies in language other than English.
Results: A total of 17 papers were identified; seven studies evaluated the efficacy of a psychologically oriented intervention (additional two provided follow-up analyses exploring the original published data) and eight studies evaluated disease management programs for patients with either irritable bowel syndrome, inflammatory bowel disease (IBD) or celiac disease. Overall, psychological eHealth interventions were associated with significant reductions in bowel symptoms and improvement in quality of life (QoL) that tended to continue up to 12 months follow up. The eHealth disease management was shown to generally improve QoL, adherence, knowledge about the disease, and reduce healthcare costs in IBD, although the studies were associated with various methodological problems, and thus, this observation should be confirmed in well-designed interventional studies.
Conclusions: Based on the evidence to date, eHealth internet-based technology is a promising tool that can be utilized to both promote and enhance gastrointestinal disease management and mental health.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=24494974
Nelson, A.E., Dowsey, M. M., Knowles, S.R., Castle, D. Salzberg, M, Monshat, K., Dunin, T., & Choong, P.F.M. (2013). Systematic Review of the Efficacy of Pre-surgical Mind-Body Based Therapies on Post-operative Outcome Measures. Complementary Therapies in Medicine, 21(6), 697–711.
Objectives: A large body of research has demonstrated that patient factors are strong predictors of recovery from surgery. Mind-body therapies are increasingly targeted at pre-operative psychological factors. The objective of this paper was to evaluate the efficacy of pre-operative mind-body based interventions on post-operative outcome measures amongst elective surgical patients.
Methods: A systematic review of the published literature was conducted using the electronic databases MEDLINE, CINAHL and PsychINFO. Randomised controlled trials (RCTs) with a prospective before-after surgery design were included.
Results: Twenty studies involving 1297 patients were included. Mind-body therapies were categorised into relaxation, guided imagery and hypnotic interventions. The majority of studies did not adequately account for the risk of bias thus undermining the quality of the evidence. Relaxation was assessed in eight studies, with partial support for improvements in psychological well-being measures, and a lack of evidence for beneficial effects for analgesic intake and length of hospital stay. Guided imagery was examined in eight studies, with strong evidence for improvements in psychological well-being measures and moderate support for the efficacy of reducing analgesic intake. Hypnosis was investigated in four studies, with partial support for improvements in psychological well-being measures. Evidence for the effect of mind-body therapies on physiological indices was limited, with minimal effects on vital signs, and inconsistent changes in endocrine measures reported.
Conclusions: This review demonstrated that the quality of evidence for the efficacy of mind-body therapies for improving post-surgical outcomes is limited. Recommendations have been made for future RCTs.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=24280480
Hyde, M. K., Knowles, S., & White, K. M. (2013). Donating blood and organs: Using an extended Theory of Planned Behavior perspective to identify similarities and differences in individual motivations to donate. Health Education Research, 28(6):1092-104; doi: 10.1093/her/cyt078.
Due to the critical shortage and continued need of blood and organ donations (ODs), research exploring similarities and differences in the motivational determinants of these behaviors is needed. In a sample of 258 university students, we used a cross-sectional design to test the utility of an extended theory of planned behavior (TPB) including moral norm, self-identity and in-group altruism (family/close friends and ethnic group), to predict people’s blood and OD intentions. Overall, the extended TPB explained 77.0% and 74.6% of variance in blood and OD intentions, respectively. In regression analyses, common contributors to intentions across donation contexts were attitude, self-efficacy and self-identity. Normative influences varied with subjective norm as a significant predictor related to OD intentions but not blood donation intentions at the final step of regression analyses. Moral norm did not contribute significantly to blood or OD intentions. In-group altruism (family/close friends) was significantly related to OD intentions only in regressions. Future donation strategies should increase confidence to donate, foster a perception of self as the type of person who donates blood and/or organs, and address preferences to donate organs to in-group members only.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=23943782
Knowles, S., Cook, S. I., & Tribbick, D. T. (2013). Relationship between health status, illness perceptions, coping strategies and psychological morbidity: a preliminary study with IBD stoma patients. Journal of Crohn's and Colitis. 7(10):e471-8. doi: 10.1016/j.crohns.2013.02.022. Epub 2013 Mar 28.
Background and aims: Individuals living with IBD and a stoma are at an increased risk of anxiety and depression and it is likely that several factors mediate these relationships, including illness perceptions and coping strategies. Using the Common Sense Model (CSM), this study aimed to characterize the mediators of anxiety and depression in an IBD stoma cohort.
Methods: Eighty-three adults (23 males) with a stoma (25 ileostomy, 58 colostomy; 26 emergency, 57 planned, 55 permanent, 28 temporary) completed an online survey. Health status was measured with the Health Orientation Scale (HOS), coping styles assessed with the Carver Brief COPE scale, illness perceptions explored with the Brief Illness Perceptions Questionnaire (BIPQ), and anxiety and depression were measured using the Hospital Anxiety and Depression Scale (HADS).
Results: Combining the questionnaire data using structural equation modeling resulted in a final model with an excellent fit (χ(2) (11)=12.86, p=0.30, χ(2)/N=1.17, SRMR<0.05, RMSEA<0.05, GFI>0.96, CFI>0.99). Consistent with the CSM, health status directly influenced illness perceptions, which in turn, influenced coping (emotion-focused and maladaptive coping). Interestingly, months since surgery was found to influence illness perceptions and emotion-focused coping directly, but not health status. While depression was influenced by illness perceptions, emotion-focused coping and maladaptive coping, anxiety was only influenced by illness perceptions and maladaptive coping.
Conclusions: The preliminary results provide further evidence for the complex interplay between psychological processes. In terms of directions for psychological interventions, a focus on identifying and working with illness perceptions is important.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=23541738
Knowles, S. R., Gass, C., & Macrea, F. (2013). Illness perceptions in IBD influence psychological status, sexual health and satisfaction, body image and relational functioning: A preliminary exploration using Structural Equation Modeling. Journal of Crohn's and Colitis. 7(9):e344-50. doi: 10.1016/j.crohns.2013.01.018.
Background and aims: This study aimed to characterize the relationships between illness perceptions, body image and self-consciousness, sexual health (sexual problems and sexual satisfaction), anxiety and depression, and marital and family functioning in patients with IBD.
Methods: Seventy-four IBD patients (44 CD, 13 males, 61 females, mean age 38 years) completed an online questionnaire. Illness perceptions explored with the Brief Illness Perceptions Questionnaire, and anxiety and depression measured using the Hospital Anxiety and Depression Scale, Sexual Problems Scale, Sexual Satisfaction Scale, Marital Functioning Scale, Family Functioning Scale, and Body Image and Self-Consciousness During Intimacy Scale.
Results: Exploratory Structural Equation Modeling (SEM) provided a final model with an excellent fit (χ(2) (25)=27.84, p=.32, χ(2)/N=1.11, CFI>0.99, RMSEA<0.04, SRMR<0.07, GFI>0.93). Illness perceptions had a significant direct influence on depression (β=0.49, p<0.001), anxiety (β=0.55, p<0.001), and family functioning (β=-0.17, p<0.001). Several mediating pathways were also found involving sexual problems, sexual satisfaction, and body image and self-consciousness during intimacy. Being female was associated with increased sexual problems but increased sexual satisfaction.
Conclusions: The findings provide further evidence for the adverse impact of patient IBD-related illness perceptions on anxiety and depression. The findings also provide the preliminary evidence for the impact of illness perceptions and psychological comorbidity in relation to sexual health and relationship and family functioning. These aspects of psychological processing provide a framework and direction for further research into the nature of IBD and its influence on the patient and their family.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=23453888
Gondalia, Shakuntla V., Mahon, Peter J., Palombo, Enzo A., Knowles Simon R. and Austin, David W. (2013). Evaluation of biogenic amines in the faeces of children with and without autism by LC-MS/MS, International Journal of Biotechnology and Biochemistry, 9(2), 245-255.
Previous researchers have postulated that gastrointestinal bacteria may contribute to the development and maintenance of Autism Spectrum Disorders (ASD). There is evidence based on quantitative evaluation of the gastrointestinal bacterial population in ASD that this is unlikely and an alternate mechanism will be examined where the bacteria may contribute to the development of ASD via their metabolic products and the role of biogenic amines (BAs) will be investigated. In humans, BAs influence a number of physiological processes via their actions as neurotransmitters, local hormones and gastric acid secretion. Various amines have been implicated in several medical conditions such as schizophrenia and colon cancer. To date, the relationship between BAs and autism has not been explored. This study has been designed to identify differences (and/or similarities) in the level of Bas in faecal samples of autistic children (without gastrointestinal dysfunction: n = 14; with gastrointestinal dysfunction; n = 21) and their neurotypical siblings (n = 35) by LC-MS/MS. Regardless of the diagnosis, severity of ASD and gastrointestinal dysfunction there were no significant differences found between the groups. The findings suggest that BAs in the gastrointestinal tract do not play a role in the pathophysiology of gastrointestinal dysfunction associated with ASD.
URL: http://dro.deakin.edu.au/view/DU:30058758
Knowles, S.R., Monshat K., Castle, D. (2013). The Efficacy and Methodological Challenges of Psychotherapy for Adults with Inflammatory Bowel Disease: A Review. Inflammatory Bowel Diseases. 19(12), 2704-2715. Impact Factor: 4.855 DOI: 10.1097/MIB.0b013e318296ae5a
Adults with inflammatory bowel disease (IBD) are at a greater risk of anxiety and depression and impaired quality of life (QoL) compared with healthy controls and other chronic physical illness groups. Consequently, the development and evaluation of well-defined and theoretically robust psychotherapeutic interventions for adults with IBD are desirable. To date, interventions have, for the most part, used multiple cross-theoretical approaches. Published reviews are heterogeneous in terms both of categorization of psychotherapeutic approaches and also of conclusions relating to efficacy. A recent Cochrane meta-analysis of randomized controlled trials found no evidence for the efficacy of these interventions in adults, as in a number of previous reviews, ideologically disparate interventions (e.g., psychodynamic and cognitive behavioral) were grouped together. We aimed to extend the currently available literature on psychological intervention in IBD by: evaluating the efficacy of specific strategies (i.e., stress management, psychodynamic, cognitive behavioral therapy, or hypnosis) in improving psychological symptoms and QoL, including all controlled and noncontrolled studies, and explicating the methodological problems in published trials. Sixteen studies (5 stress management, 4 psychodynamic, 5 cognitive behavioral therapy, and 2 hypnosis) were evaluated. Interventions predominantly based on stress management showed only modest benefits for IBD or mental health symptoms or QoL. Cognitive behavioral therapy studies showed generally consistent benefits in terms of anxiety and depression symptoms, but inconsistent outcomes regarding IBD symptoms. Psychodynamically informed interventions reduced depressive and anxiety symptoms, but not IBD severity. Both hypnosis studies, albeit using different methods, seemed to have a more positive impact on disease severity than mental health symptoms or QoL. Our results suggest that while further well-designed and evaluated interventions are needed, psychological input can make a positive contribution to best practice multidisciplinary treatment of adults with IBD.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=23846488
Hyde, M., Knowles, S. R., & White, K. (2013) What predicts university students’ intentions to volunteer their time for community service? Australian Journal of Psychology, 65(3), 135-145. DOI: 10.1111/ajpy.12014.
University students represent one target population with great potential to serve as volunteers. The primary focus on describing the characteristics of students who choose to volunteer, however, has resulted in limited understanding of the psychosocial factors impacting on students’ decisions to volunteer. To bridge this gap, we used an extension of a well-known theoretical framework, the theory of planned behaviour (TPB), to predict students’ intentions to volunteer for community service. Using content and thematic analysis, we explored also students’ motivations and constraints for volunteering. Students (N = 235; M age = 22.09 years) self-reported their attitude, normative influences, control perceptions, moral obligation, past behaviour, demographic characteristics, and intentions for volunteering via questionnaire. Regression analyses showed that the extended TPB explained 67% of the variance in students’ volunteering intentions. In qualitative analyses, themes primarily represented the factors contributing to low efficacy for volunteering (e.g., time constraints). Control perceptions and perceived moral obligations related to volunteering represent important future targets to encourage student volunteering for organisations providing critical services for those most in need.
URL: http://onlinelibrary.wiley.com/doi/10.1111/ajpy.12014/full
Knowles, S.R., Wilson, J., Wilkinson, A., Connell, W., Salzberg, M., Castle, D., Desmond, P., & Kamm, M.A. (2013). Psychological Well-being and Quality of Life in Crohn’s Disease Patients with a Stoma. Journal of Wound, Ostomy and Continence Nursing, 40(6):623-9. doi: 10.1097/WON.0b013e3182a9a75b.
Purpose: The aims of this research were to explore associations among elective versus emergency surgery, type of ostomy (permanent vs temporary), illness perceptions and coping style, anxiety, depression, and health-related quality of life in persons with Crohn’s disease. A further aim was to determine the extent of current and past use of psychological care and use of psychotropic medications.
Subjects and setting: The sample comprised 31 persons (17 men and 14 women; mean age 45 years) with Crohn’s disease and an ostomy from 2 large teaching hospitals in Melbourne, Australia.
Methods: Data were collected using a descriptive, cross-sectional design. The questionnaire incorporated 3 validated instruments: the Brief Illness Perceptions Questionnaire, the Hospital Anxiety and Depression Scale, and the Stoma Quality of Life Scale.
Results: Poor illness perception correlated significantly with increased anxiety, depression, and reduced health-related quality of life (specifically, sexuality and body image, work and social functioning, stoma function, and financial concerns). Forty-eight percent of patients scored more than the cutoff for anxiety, and 42% scored more than the cutoff for depression on the Hospital Anxiety and Depression Scale. Of these, only 20% and 31%, respectively, reported currently receiving psychological care. The timing of ostomy surgery (planned vs emergency) or ostomy type (permanent vs temporary) was not significantly associated with anxiety, depression, or health-related impaired quality of life.
Conclusions: In this exploratory, cross-sectional study, patients with Crohn’s disease and a stoma had high rates of psychological comorbidity and low scores on quality of life. Adverse illness perception appeared to explain some of these findings, but most were not receiving psychological help. Psychological care is indicated for many of these patients and further research is indicated.
URL: https://www.ncbi.nlm.nih.gov/pubmed/24202226