Publications by authors named "Rhonda F Brown"

26 Publications

  • Page 1 of 1

A Comparison of Physical Activity Levels, Sleep Disrupting Behavior, and Stress/Affective Distress as Predictors of Sleep as Indexed by Actigraphy.

J Phys Act Health 2021 Jun 13:1-12. Epub 2021 Jun 13.

Background: Several behaviors have been reported to interfere with sleep in otherwise healthy adults, including low physical activity (PA) levels. However, few studies have compared low PA with the other behavioral risk factors of objective sleep impairment, despite the behavior tending to cooccur in highly stressed and affectively distressed individuals. Thus, the authors compared objective and subjective measures of PA and other potential sleep disrupting behaviors as predictors of objective sleep (sleep onset latency, actual sleep time, total sleep duration, awake time, and sleep efficacy) at baseline (T1) and 3 months later (T2).

Methods: A community-derived sample of 161 people aged 18-65 years were asked about PA, other behavior (ie, night eating, electronic device use, watching television, caffeine and alcohol use), stress, affective distress (ie, anxiety, depression), and demographics including shift work and parenting young children in an online questionnaire at T1 and T2. PA and sleep were also monitored for 24 hours each at T1 and T2 using actigraphy.

Results: Multiple regression analyses indicated that sleep at T1 was associated with PA (ie, total number of steps, metabolic equivalents/time, time spent travelling) after controlling mean ambient temperature and relevant demographics. At T2, longer sleep onset latency was predicted by parenting young children and night time television viewing; shorter sleep duration was predicted by female gender; and awake time and sleep efficacy were predicted by alcohol intake after controlling T1 sleep measures, demographics, and mean ambient temperature.

Conclusion: The risk factors for objective sleep impairment included parenting young children and watching television at night, whereas better sleep outcomes were associated with greater engagement with PA.
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http://dx.doi.org/10.1123/jpah.2020-0042DOI Listing
June 2021

Quality of life and fear of cancer recurrence in patients and survivors of non-Hodgkin lymphoma.

Psychol Health Med 2021 Apr 30:1-12. Epub 2021 Apr 30.

School of Psychology, University of New England, Armidale, Australia.

Non-Hodgkin lymphoma (NHL) is a common haematological cancer that is comprised of approximately 30 subtypes, of which Waldenström Macroglobulinemia (WM) is a rare incurable form. It is typically managed using a watch-and-wait strategy that can contribute to illness uncertainty which may result in fear of cancer recurrence (FCR) and poor health-related quality of life (QOL). However, few studies have examined the correlates of FCR and QOL in NHL patients, including WM patients. One-hundred males and 92 females with a mean age of 62.7 years who were an average of 6.8 years from diagnosis completed the online questionnaire which asked about demographics, medical history, QOL, FCR, stress, anxiety and depression. Few NHL patients reported significant stress or affective distress, most had moderate-high QOL and 41% experienced recent FCR, relative to published cut-off scores. Poorer QOL was related to depression symptoms, FCR, higher illness burden (i.e. comorbidity) and fewer personal resources (i.e. unemployed), whereas FCR was related to shorter time since diagnosis and more depressive symptoms. Results suggest that FCR and depressive symptoms may adversely impact QOL, whereas a recent cancer diagnosis and depression-related pessimism may contribute to FCR.
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http://dx.doi.org/10.1080/13548506.2021.1913756DOI Listing
April 2021

Modeling the Effects of Stress, Anxiety, and Depression on Rumination, Sleep, and Fatigue in a Nonclinical Sample.

J Nerv Ment Dis 2019 05;207(5):355-359

Psychology Lane, University of New England, Armidale.

Stress and affective distress have previously been shown to predict sleep quality, and all the factors have been shown to predict fatigue severity. However, few prior studies have examined the likely indirect mediational relationships between stress, affective distress, and sleep quality in predicting fatigue severity, and the potential role played by ruminative thinking. A short questionnaire asked 229 participants about their recent experiences of stress, affective distress, rumination, sleep, and fatigue in a community sample. High stress, anxiety, and depression were related to more ruminative thinking, which in turn was related to poor sleep quality (composed of subjective sleep quality, daytime dysfunction, sleep latency, and sleep disturbance) and poor sleep quality predicted worse fatigue. The results suggest that rumination parsimoniously explains the tendency of stress and affective distress to contribute to poor sleep quality, and together with poor sleep, it may also contribute to worse fatigue in some individuals.
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http://dx.doi.org/10.1097/NMD.0000000000000973DOI Listing
May 2019

Autism spectrum disorder and interoception: Abnormalities in global integration?

Autism 2019 01 15;23(1):212-222. Epub 2017 Nov 15.

University of Zurich, Switzerland.

Research over the past three decades has seen a revived interest in the way the human body-and the way in which it is perceived-interacts with aspects of our experience. Consequently, interoception (i.e. the perception of physiological feedback from the body) has recently been shown to be associated with a wide range of cognitive, emotional, and affective functions, making it broadly relevant to the study of autism spectrum disorder. Although limited qualitative accounts and empirical studies suggest that individuals with autism spectrum disorder encounter abnormalities when perceiving and integrating physiological feedback from their bodies, other studies have suggested that people with/without autism spectrum disorder do not differ in interoceptive ability after accounting for alexithymia. In this article, we discuss the newly recognized importance of interoception in autism spectrum disorder with a focus on how deficits in the perception of bodily feedback might relate to the core features and co-occuring psychopathology of autism spectrum disorder. Finally, a new integrated theory is advanced which posits that people with autism spectrum disorder may experience a reduced capacity to integrate interoceptive information that may result in a narrow attentional bodily focus and reduced motivational and behavioral drives.
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http://dx.doi.org/10.1177/1362361317738392DOI Listing
January 2019

Can body temperature dysregulation explain the co-occurrence between overweight/obesity, sleep impairment, late-night eating, and a sedentary lifestyle?

Eat Weight Disord 2017 Dec 19;22(4):599-608. Epub 2017 Sep 19.

The Australian National University, Canberra, Australia.

Purpose: Overweight/obesity, sleep disturbance, night eating, and a sedentary lifestyle are common co-occurring problems. There is a tendency for them to co-occur together more often than they occur alone. In some cases, there is clarity as to the time course and evolution of the phenomena. However, specific mechanism(s) that are proposed to explain a single co-occurrence cannot fully explain the more generalized tendency to develop concurrent symptoms and/or disorders after developing one of the phenomena. Nor is there a clinical theory with any utility in explaining the development of co-occurring symptoms, disorders and behaviour and the mechanism(s) by which they occur. Thus, we propose a specific mechanism-dysregulation of core body temperature (CBT) that interferes with sleep onset-to explain the development of the concurrences.

Methods: A detailed review of the literature related to CBT and the phenomena that can alter CBT or are altered by CBT is provided.

Results: Overweight/obesity, sleep disturbance and certain behaviour (e.g. late-night eating, sedentarism) were linked to elevated CBT, especially an elevated nocturnal CBT. A number of existing therapies including drugs (e.g. antidepressants), behavioural therapies (e.g. sleep restriction therapy) and bright light therapy can also reduce CBT.

Conclusions: An elevation in nocturnal CBT that interferes with sleep onset can parsimoniously explain the development and perpetuation of common co-occurring symptoms, disorders and behaviour including overweight/obesity, sleep disturbance, late-night eating, and sedentarism. Nonetheless, a significant correlation between CBT and the above symptoms, disorders and behaviour does not necessarily imply causation. Thus, statistical and methodological issues of relevance to this enquiry are discussed including the likely presence of autocorrelation.

Level Of Evidence: Level V, narrative review.
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http://dx.doi.org/10.1007/s40519-017-0439-0DOI Listing
December 2017

Effects of a Mindfulness Intervention on Sports-Anxiety, Pessimism, and Flow in Competitive Cyclists.

Appl Psychol Health Well Being 2016 Mar;8(1):85-103

Australia National University, Canberra, Australia.

Background: This study investigated whether mindfulness training increases athletes' mindfulness and flow experience and decreases sport-specific anxiety and sport-specific pessimism.

Methods: Cyclists were assigned to an eight-week mindfulness intervention, which incorporated a mindful spin-bike training component, or a wait-list control condition. Participants completed baseline and post-test measures of mindfulness, flow, sport-anxiety, and sport-related pessimistic attributions.

Results: Analyses of covariance showed significant positive effects on mindfulness, flow, and pessimism for the 27 cyclists in the mindfulness intervention condition compared with the 20 cyclists in the control condition. Changes in mindfulness experienced by the intervention participants were positively associated with changes in flow.

Conclusions: Results suggest that mindfulness-based interventions tailored to specific athletic pursuits can be effective in facilitating flow experiences.
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http://dx.doi.org/10.1111/aphw.12063DOI Listing
March 2016

Perceived cognitive difficulties and cognitive test performance as predictors of employment outcomes in people with multiple sclerosis.

J Int Neuropsychol Soc 2015 Feb 2;21(2):156-68. Epub 2015 Mar 2.

3Department of Psychology,Macquarie University,Sydney,Australia.

Perceived cognitive difficulties and cognitive impairment are important determinants of employment in people with multiple sclerosis (pwMS). However, it is not clear how they are related to adverse work outcomes and whether the relationship is influenced by depressive symptoms. Thus, this study examined perceived and actual general cognitive and prospective memory function, and cognitive appraisal accuracy, in relation to adverse work outcomes. The possible mediating and/or moderating role of depression was also examined. A cross-sectional community-based sample of 111 participants (33 males, 78 females) completed the Multiple Sclerosis Work Difficulties Questionnaire (MSWDQ), Beck Depression Inventory - Fast Screen (BDI-FS), and questions related to their current or past employment. They then underwent cognitive testing using the Screening Examination for Cognitive Impairment, Auditory Consonant Trigrams test, Zoo Map Test, and Cambridge Prospective Memory Test. Perceived general cognitive and prospective memory difficulties in the workplace and performance on the respective cognitive tests were found to predict unemployment and reduced work hours since MS diagnosis due to MS. Depression was also related to reduced work hours, but it did not explain the relationship between perceived cognitive difficulties and the work outcomes. Nor was it related to cognitive test performance. The results highlight a need to address the perceptions of cognitive difficulties together with cognitive impairment and levels of depression in vocational rehabilitation programs in pwMS.
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http://dx.doi.org/10.1017/S1355617715000053DOI Listing
February 2015

Cannabis use and anxiety: is stress the missing piece of the puzzle?

Front Psychiatry 2014 24;5:168. Epub 2014 Nov 24.

The Australian National University , Canberra, ACT , Australia.

Objective: Comorbidity between anxiety and cannabis use is common yet the nature of the association between these conditions is not clear. Four theories were assessed, and a fifth hypothesis tested to determine if the misattribution of stress symptomology plays a role in the association between state-anxiety and cannabis.

Methods: Three-hundred-sixteen participants ranging in age from 18 to 71 years completed a short online questionnaire asking about their history of cannabis use and symptoms of stress and anxiety.

Results: Past and current cannabis users reported higher incidence of lifetime anxiety than participants who had never used cannabis; however, these groups did not differ in state-anxiety, stress, or age of onset of anxiety. State-anxiety and stress were not associated with frequency of cannabis use, but reported use to self-medicate for anxiety was positively associated with all three. Path analyses indicated two different associations between anxiety and cannabis use, pre-existing and high state-anxiety was associated with (i) higher average levels of intoxication and, in turn, acute anxiety responses to cannabis use; (ii) frequency of cannabis use via the mediating effects of stress and self-medication.

Conclusion: None of the theories was fully supported by the findings. However, as cannabis users reporting self-medication for anxiety were found to be self-medicating stress symptomology, there was some support for the stress-misattribution hypothesis. With reported self-medication for anxiety being the strongest predictor of frequency of use, it is suggested that researchers, clinicians, and cannabis users pay greater attention to the overlap between stress and anxiety symptomology and the possible misinterpretation of these related but distinct conditions.
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http://dx.doi.org/10.3389/fpsyt.2014.00168DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4241884PMC
December 2014

Development of the Tinnitus response scales: factor analyses, subscale reliability and validity analyses.

Int Tinnitus J 2013 ;18(1):45-56

School of Behavioral, Cognitive and Social Sciences - University of New England - Armidale - Australia.

Objective: Patients suffering with tinnitus are often advised to accept the noise, but few studies have examined what tinnitus acceptance entails. The present project developed and tested a new instrument to assess the mindfulnessbased constructs of acceptance, control, and defeat, in relation to the experience of chronic tinnitus.

Method: Initial scale development involved an expert panel. Participants were recruited from the general population and tinnitus support organizations and complete the first version of the Tinnitus Response Scales (TRS) and measures of tinnitus coping, severity and distress, general distress, illness cognitions, and tinnitus and health characteristics.

Results: Three interpretable TRS factors were found: acceptance, control and defeat (an Internet sample, N = 273) and confirmed using another sample (hard-copy sample, N = 278). Factors were shown to have high internal consistency and testretest reliabilities and differed in terms of their related cognitions, behaviour, and emotional responses to tinnitus, and their tinnitus characteristics.

Conclusion: The TRS factors provide an alternative conceptualisation of tinnitus responding. TRS is a brief psychometrically valid measure of tinnitus responding that appears to distinguish between adaptive and non-adaptive responses to tinnitus noise, and should prove useful as a clinical measure.
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http://dx.doi.org/10.5935/0946-5448.20130007DOI Listing
May 2015

The multiple sclerosis work difficulties questionnaire (MSWDQ): development of a shortened scale.

Disabil Rehabil 2014 20;36(8):635-41. Epub 2013 Jun 20.

School of Psychology, Mathews Building, University of New South Wales , New South Wales , Australia .

Background: The Multiple Sclerosis Work Difficulties Questionnaire (MSWDQ) is a recently developed, internally consistent and valid 50-item measure of self-reported workplace difficulties in pwMS.

Objective: In this study, the second-order factor structure of the MSWDQ was assessed, with the aim of developing a short version of the scale.

Methods: Cross-sectional MSWDQ data were obtained along with employment and MS disease information, in a community-based sample of 189 pwMS. Final items for the shortened version were selected to ensure both item breadth and adequacy of psychometric properties.

Results: Confirmatory Factor Analysis on the 12 MSWDQ factors yielded a model comprised of three second-order factors termed physical barriers, psychological/cognitive barriers and external barriers, which formed the basis of the shorter 23-item scale, the MSWDQ-23. The MSWDQ-23 showed excellent subscale internal consistencies. It explained 29% of the variance in reduced work hours since diagnosis, 22% of the variance in expectations of withdrawing from work, 24% of the variance in expectations of reduced work hours and 32% of the variance in expectations of changing type of work due to MS.

Conclusion: The MSWDQ-23 is a brief valid and internally consistent measure of workplace difficulties that can predict both employment outcomes and expectations in pwMS. It is an especially useful tool for clinicians who wish to quickly obtain an indication of the extent of psychological/cognitive, physical and/or external difficulties experienced by individual pwMS in the workplace. Implications for Rehabilitation The MSWDQ-23 is a shortened self-report survey that examines work difficulties in people with MS across three broad domains: psychological/cognitive barriers, physical barriers and external barriers. The MSWDQ-23 is a valid and reliable measure that is capable of predicting various employment outcomes and expectations.
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http://dx.doi.org/10.3109/09638288.2013.805258DOI Listing
December 2014

A qualitative study of stress and coping responses in doctors breaking bad news.

Patient Educ Couns 2013 May 1;91(2):243-8. Epub 2012 Dec 1.

Sydney Medical School, University Of Sydney, Sydney, Australia.

Objective: Breaking bad news (BBN) is a significant source of stress for doctors. In this study we qualitatively explored doctors' perceptions of their BBN experiences, to identify the range of appraisal and coping processes associated with this task.

Methods: Individual semi-structured interviews were conducted with 28 junior and senior doctors.

Results: Doctors recalled physical and emotional stress symptoms during the BBN task, although they tended not to describe it as a 'stressful' experience. Senior doctors appeared to engage in more problem-focused and meaning-focused coping strategies than junior doctors, and this may have been due to their greater experience and control over patient selection and work structures.

Conclusions: This study provides insight into the range of different coping responses experienced by doctors in relation to the task of breaking bad medical news.

Practice Implications: The results reinforce and refine the imperative for further training to address the impact of BBN from the doctor's perspective if performance of this critical task is to be improved.
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http://dx.doi.org/10.1016/j.pec.2012.11.006DOI Listing
May 2013

Argentine tango dance compared to mindfulness meditation and a waiting-list control: a randomised trial for treating depression.

Complement Ther Med 2012 Dec 3;20(6):377-84. Epub 2012 Aug 3.

University of New England, Australia.

Objectives: To determine whether tango dancing is as effective as mindfulness meditation in reducing symptoms of psychological stress, anxiety and depression, and in promoting well-being.

Design: This study employed analysis of covariance (ANCOVA) and multiple regression analysis.

Participants: Ninety-seven people with self-declared depression were randomised into tango dance or mindfulness meditation classes, or to control/waiting-list.

Setting: classes were conducted in a venue suitable for both activities in the metropolitan area of Sydney, Australia.

Interventions: Participants completed six-week programmes (1½h/week of tango or meditation). The outcome measures were assessed at pre-test and post-test.

Main Outcome Measures: Depression, Anxiety and Stress Scale; The Self Esteem Scale; Satisfaction with Life Scale, and Mindful Attention Awareness Scale.

Results: Sixty-six participants completed the program and were included in the statistical analysis. Depression levels were significantly reduced in the tango (effect size d=0.50, p=.010), and meditation groups (effect size d=0.54, p=.025), relative to waiting-list controls. Stress levels were significantly reduced only in the tango group (effect size d=0.45, p=.022). Attending tango classes was a significant predictor for the increased levels of mindfulness R(2)=.10, adjusted R(2)=.07, F (2,59)=3.42, p=.039.

Conclusion: Mindfulness-meditation and tango dance could be effective complementary adjuncts for the treatment of depression and/or inclusion in stress management programmes. Subsequent trials are called to explore the therapeutic mechanisms involved.
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http://dx.doi.org/10.1016/j.ctim.2012.07.003DOI Listing
December 2012

Control cognitions and causal attributions as predictors of fatigue severity in a community sample.

J Soc Psychol 2012 Mar-Apr;152(2):185-98

University of New England, School of Psychology, Armidale, NSW, Australia.

Control cognitions and causal attributions of fatigue were examined in relation to Weiner's Causal Attribution theory in a community sample. Participants were 97 females and 43 males, aged 18-83 years. Weiner's dimensions of stability and uncontrollability and physical and psychosocial attributions of fatigue were related to fatigue severity. Escape-avoidance coping mediated between psychosocial causal attributions of fatigue to fatigue; whereas planful problem-solving and exercise moderated between stability cognitions to fatigue and psychosocial attributions of fatigue to fatigue, respectively. This, the cause(s) of fatigue were perceived as stable, uncontrollable, and involving physical and psychosocial factors, participants reported worse fatigue. Taken together, the results suggest that fatigue treatments may be most effective when they are tailored or matched to the belief systems of the individuals with fatigue.
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http://dx.doi.org/10.1080/00224545.2011.586655DOI Listing
May 2012

The multiple sclerosis work difficulties questionnaire.

Mult Scler 2012 Jun 6;18(6):871-80. Epub 2011 Dec 6.

School of Cognitive Behavioural & Social Sciences, University of New England, Armidale, NSW, Australia.

Background: A better understanding of the workplace difficulties experienced by people with multiple sclerosis (PwMS) may be critical to developing appropriate vocational and rehabilitative programs.

Objective: We aimed to assess the factor structure, internal consistency and validity of the new Multiple Sclerosis Work Difficulties Questionnaire (MSWDQ).

Methods: Work difficulty items were developed and reviewed by a panel of experts. Using the MSWDQ, cross-sectional self-report data of work difficulties were obtained in addition to employment status and MS disease information, in a community-based sample of 189 PwMS.

Results: Exploratory Maximum Likelihood Factor Analysis on the draft questionnaire yielded 50 items measuring 12 factors. Subscale internal consistencies ranged from 0.74 to 0.92, indicating adequate to excellent internal consistency reliability. The MSWDQ explained 40% of the variance in reduced work hours since diagnosis, 40% of the variance in expectations about withdrawing from work, 34% of the variance in expectations about reducing work hours, and 39% of the variance in expectations about changing type of work due to MS.

Conclusion: The MSWDQ is a valid and internally reliable measure of workplace difficulties in PwMS. Physical difficulties, as well as cognitive and psychological difficulties were important predictors of workplace outcomes and expectations about future employment.
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http://dx.doi.org/10.1177/1352458511431724DOI Listing
June 2012

The 'grass ceiling': limitations in the literature hinder our understanding of cannabis use and its consequences.

Addiction 2011 Feb 11;106(2):238-44. Epub 2010 Nov 11.

School of Behavioural and Social Sciences and Humanities, University of Ballarat, Ballarat, VIC, Australia.

Aim: To illustrate how limitations in the cannabis literature undermine our ability to understand cannabis-related harms and problems experienced by users and identify users at increased risk of experiencing adverse outcomes of use.

Method And Results: Limitations have been organized into three overarching themes. The first relates to the classification systems employed by researchers to categorize cannabis users, their cannabis use and the assumptions on which these systems are based. The second theme encompasses methodological and reporting issues, including differences between studies, inadequate statistical control of potential confounders, the under-reporting of effect sizes and the lack of consideration of clinical significance. The final theme covers differing approaches to studying cannabis use, including recruitment methods. Limitations related to the nature of the data collected by researchers are discussed throughout, with a focus on how they affect our understanding of cannabis use and users.

Conclusions: These limitations must be addressed to facilitate the development of effective and appropriately targeted evidence-based public health campaigns, treatment programmes and preventative, early intervention and harm minimization strategies, and to inform cannabis-related policy and legislation.
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http://dx.doi.org/10.1111/j.1360-0443.2010.03139.xDOI Listing
February 2011

Stressful life-events and fatigue in a nonclinical sample.

J Nerv Ment Dis 2009 Sep;197(9):707-10

School of Behavioural, Cognitive and Social Sciences, University of New England, NSW, Australia.

There is a lack of systematic examination of the relationship between different stressor features and fatigue. Thus, we examined which features of stressors (e.g. frequency, duration, severity, valence, type) were most strongly related to fatigue levels. Eighty-nine participants completed a short fatigue questionnaire and a comprehensive stress interview. High fatigue levels were found to be most strongly related to the number of acute interpersonal stressors and chronic difficulty stressors (<6 months duration) and psychological distress, but no other stressor measure. Thus, acute and chronic stressor frequency counts might be the best measures used in future studies assessing the relationship between stressors and fatigue.
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http://dx.doi.org/10.1097/NMD.0b013e3181b3af36DOI Listing
September 2009

Stress, psychological distress, psychosocial factors, menopause symptoms and physical health in women.

Maturitas 2009 Feb 22;62(2):160-5. Epub 2009 Jan 22.

Griffith University, Australia.

Objectives: Relatively few studies have evaluated relationships between stress, psychological distress, psychosocial factors and menopause symptoms, and none have evaluated emotional intelligence (EI) in relation to menopause. In this study, direct and indirect relationships were evaluated between stress, psychological distress, psychosocial factors (e.g. social support, coping, EI), menopause symptom severity and physical health in middle-aged women.

Methods: One hundred and sixteen women aged 45-55 years were recruited through women's health centres and community organizations. They completed a short questionnaire asking about stress, psychological distress (i.e. anxiety, depression), EI, attitude to menopause, menopause symptoms and physical health.

Results: Low emotional intelligence was found to be related to worse menopause symptoms and physical health, and these associations were partly mediated by high stress, anxiety and depression, a negative attitude to menopause and low proactive coping.

Conclusions: Women with high EI appear to hold more positive attitudes to menopause and experience less severe stress, psychological distress and menopause symptoms and better physical health. These results suggest that women who expect menopause to be a negative experience or are highly stressed or distressed may be more likely to experience a more negative menopause.
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http://dx.doi.org/10.1016/j.maturitas.2008.12.004DOI Listing
February 2009

Mediators and moderators of the stressor-fatigue relationship in nonclinical samples.

J Psychosom Res 2009 Jan 22;66(1):21-9. Epub 2008 Nov 22.

Psychology School of Behavioural, Cognitive and Social Sciences, University of New England, Armidale, NSW, Australia.

Objective: Two cross-sectional studies examined statistical mediators and moderators of the stressful life event (SLE)-fatigue relationship. If such factors can be delineated, they might suggest possible avenues for improving current psychological treatments for fatigue.

Methods: In Study 1, 281 (63 males and 218 females) participants, 18 to 70 years, completed a questionnaire asking about stressors, social support, demographics, and fatigue. In Study 2, 609 (225 males and 384 females) participants, 18 to 80 years, answered questions about the abovementioned variables, and sleep quality and use of sleep medications.

Results: Younger age, more SLEs, and low social support satisfaction were found to be related to fatigue levels in Study 1. These results were replicated in Study 2, and, additionally, sleep disturbance (i.e., low sleep quality, use of sleep medications) was related to fatigue levels, while age was related to fatigue via the use of sleep medications. The SLE-fatigue relationship was found to be mediated through different mechanisms in males and females: social support dissatisfaction and sleep quality mediated the relationship in females, while sleep quality mediated the relationship in males.

Conclusion: These results suggest that gender tailoring of psychological treatments may improve their effectiveness in treating fatigue, in particular, by targeting social support satisfaction in females and sleep hygiene in both sexes.
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http://dx.doi.org/10.1016/j.jpsychores.2008.06.010DOI Listing
January 2009

Immunological disturbance and infectious disease in anorexia nervosa: a review.

Acta Neuropsychiatr 2008 Jun;20(3):117-28

3Eating Disorders Program, Department of Psychiatry, University of British Columbia, Vancouver, British Columbia, Canada.

Objective: Severely malnourished patients with anorexia nervosa (AN) are reported to show fewer symptomatic viral infections and a poorer response to bacterial infection than controls. They are also reported to show mild immune system changes, although the relevance of these to altered infection disease presentation in AN and AN pathophysiology is unknown. Thus, in this paper, we suggest a range of immune system changes that might underpin these altered responses to common pathogens, and review a number of recent infectious disease findings for their utility in explaining the pathophysiology of AN.

Methods: A systematic review of the literature pertaining to immunity and infectious disease in AN was performed.

Results: AN is associated with leucopenia, and the increased spontaneous and stimulated levels of proinflammatory cytokines [i.e. interleukin (IL)-1β, IL-6 and tumour necrosis factor α). A range of less consistent findings are also reviewed. Most of these data were not controlled for length of illness, degree of malnutrition, micronutrient or vitamin deficiencies or recent refeeding and starvation.

Conclusion: Cytokine disturbances have been suggested to be causally related to AN symptomatology and pathophysiology of AN, although the evidence supporting this assertion is lacking. Immune and cytokine changes in AN do, however, occur in association with a decreased incidence of symptomatic viral infection, decreased clinical response to bacterial infection leading to delayed diagnosis and increased morbidity and mortality associated with the infections.
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http://dx.doi.org/10.1111/j.1601-5215.2008.00286.xDOI Listing
June 2008

Efficacy of an emotion-focused treatment for prolonged fatigue.

Behav Modif 2008 Sep 16;32(5):699-713. Epub 2008 Apr 16.

University of New England, Armidale, NSW, Australia.

Previous research findings have suggested a relationship between less adaptive emotional functioning and fatigue. The present study used a research design involving multiple baselines across participants to evaluate the efficacy of a new emotion-focused treatment for prolonged fatigue delivered in a cognitive behavioral therapy framework. The 13 adults participating in the study met the criteria for prolonged fatigue and provided fatigue baselines of 2, 5, or 8 weeks. The results indicated that the treatment was effective, with fatigue severity levels after the initiation of treatment significantly lower than that predicted by baseline patterns, as determined by the split median method of trend estimation. At 3-4 months after treatment, 8 of 11 clients who completed the treatment no longer met the criteria for prolonged fatigue.
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http://dx.doi.org/10.1177/0145445508317133DOI Listing
September 2008

The impact of a self-efficacy intervention on short-term breast-feeding outcomes.

Health Educ Behav 2009 Apr 24;36(2):250-8. Epub 2007 Sep 24.

University of New England, Armidale, New South Wales, Australia.

Maternal self-efficacy for breast-feeding may contribute to success in breast-feeding. This study aimed to increase breast-feeding self-efficacy and actual breast-feeding through an intervention based on Bandura's self-efficacy theory. A total of 90 pregnant women participated in the study. The women who were assigned to a breast-feeding self-efficacy intervention showed significantly greater increases in breast-feeding self-efficacy than did the women in the control group. Furthermore, at 4 weeks postpartum, women in the intervention group showed a trend toward breast-feeding their infants longer and more exclusively than did those in the control group. Greater increases in breast-feeding self-efficacy were associated with a significantly higher level of breast-feeding. Replicating previous research, breast-feeding self-efficacy was significantly related to concurrent breast-feeding behavior, and high antenatal breast-feeding self-efficacy predicted a higher level of later breast-feeding in control-group women. These findings have implications for breast-feeding support programs and for the potential general utility of self-efficacy-based interventions in health education.
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http://dx.doi.org/10.1177/1090198107303362DOI Listing
April 2009

Direct and indirect relationships between emotional intelligence and subjective fatigue in university students.

J Psychosom Res 2006 Jun;60(6):585-93

Department of Psychology, University of New England, ARMIDALE NSW 2351, Australia.

Objective: The aim of this study was to examine the direct and indirect relationships between emotional intelligence and subjective fatigue.

Methods: One hundred sixty seven university students completed questionnaires assessing subjective fatigue, emotional intelligence, and a range of other psychosocial factors. A series of regression analyses were used to examine the direct and indirect relationships between subjective fatigue and psychosocial factors.

Results: Higher emotional intelligence was associated with less fatigue. The psychosocial variables depression, anxiety, optimism, internal health locus of control, amount of social support, and satisfaction with social support each partially mediated between emotional intelligence and fatigue. Additionally, sleep quality partially mediated between emotional intelligence and fatigue.

Conclusion: These findings regarding the association between subjective fatigue, emotional intelligence, and other psychosocial factors may facilitate an understanding of the aetiology of fatigue and contribute to future research examining interventions aimed at helping individuals cope with fatigue.
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http://dx.doi.org/10.1016/j.jpsychores.2006.05.001DOI Listing
June 2006

Bacterial infections in anorexia nervosa: delayed recognition increases complications.

Int J Eat Disord 2005 Apr;37(3):261-5

Department of Psychology, University of New England, Armidale, New South Wales, Australia.

Objective: We compared the natural history of bacterial infection in patients with anorexia nervosa (AN) with controls, and assessed which of a range of patient characteristics were associated with infection, fever response, and the rate of infectious complications in AN patients.

Method: The charts of 311 consecutive hospital admissions of AN patients were reviewed. Patients who had a bacterial infection while in the hospital were compared with the AN patients who did not have an infection, with respect to a range of demographic and disease variables. Fever response and infection complication rate also were evaluated in AN patients with a bacterial infection and in nonanorectic control subjects admitted with a bacterial infection.

Results: AN patients with a bacterial infection showed a reduced fever response, were often difficult to diagnose because of fewer signs and symptoms, and infection became more frequent with increasing patient age.

Discussion: A reduction in fever response and the signs and symptoms of infection significantly delayed diagnosis in AN patients and increased the complication rate from bacterial infection. We recommend that an increased index of suspicion and an early complete blood count and bacteriologic cultures be adopted for the investigation of bacterial infection in AN patients.
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http://dx.doi.org/10.1002/eat.20135DOI Listing
April 2005

Education and role modelling for clinical decisions with female cancer patients.

Health Expect 2004 Dec;7(4):303-16

Medical Psychology Research Unit, University of Sydney, Sydney, NSW, Australia.

Background: Patients vary widely in their preferences and capacity for participating in treatment decision-making. There are few interventions targeting patient understanding of how doctors make decisions and shared decision-making. This randomized trial investigates the effects of providing cancer patients with a package designed to facilitate shared decision-making prior to seeing their oncologist.

Patients And Methods: Sixty-five female cancer patients were randomized to receive either the package (booklet and 15-min video) or a booklet on living with cancer, before their initial consultation. Participants completed questionnaires prior to the intervention, immediately after the oncology consultation, and 2 weeks and 6 months later. The first consultation with the oncologist was audio-taped and transcribed.

Results: Patients receiving the package were more likely than controls to declare their information and treatment preferences in the consultation, and their perspectives on the costs, side-effects and benefits of treatment. Doctors introduced considerably more new themes in the consultations with intervention subjects than they did with controls; no other differences in doctor behaviour were noted.

Conclusions: This short intervention successfully shifted patient and doctor behaviour closer to the shared decision-making model, although it did not alter patients' preferences for information or involvement.
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http://dx.doi.org/10.1111/j.1369-7625.2004.00294.xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5060262PMC
December 2004

HPA axis activation and neurochemical responses to bacterial translocation from the gastrointestinal tract.

Ann N Y Acad Sci 2003 May;992:21-9

Department of Pharmacology and Therapeutics, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130-3932, USA.

Stress can cause migration of indigenous bacterial flora from the gut to the peritoneum, a phenomenon known as bacterial translocation. Destruction of the cell walls of gram-negative bacteria can result in the production of endotoxin (lipopolysaccharide, LPS), which is the likely cause of sepsis. Exogenously administered LPS can activate the hypothalamo-pituitary-adrenal (HPA) axis as well as brain noradrenergic and indoleaminergic systems. Thus, it is possible that activations of these systems associated with laboratory stressors in rats and mice could be attributed to bacterial translocation and LPS production. To test this hypothesis we conducted experiments on the time course of bacterial translocation in response to restraint in mice, while measuring HPA and neurochemical responses. These experiments failed to show good correlations between the occurrence of bacterial translocation and HPA and neurochemical activations, suggesting that the later responses were not linked to bacterial translocation. This conclusion was supported by the observation of normal neurochemical responses to restraint in germ-free mice. In further experiments, translocation of Salmonella typhimurium, a bacterium that readily translocates in unstressed animals, was associated with HPA activation and noradrenergic and indoleaminergic responses, indicating that bacterial translocation can indeed activate the HPA axis and brain amines. However, the above experiments suggest that this is not the mechanism by which restraint activates these systems.
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http://dx.doi.org/10.1111/j.1749-6632.2003.tb03134.xDOI Listing
May 2003

Responding to the active and passive patient: flexibility is the key.

Health Expect 2002 Sep;5(3):236-45

Medical Psychology Research Unit, University of Sydney, Sydney, NSW 2006, Australia.

Background: Patients vary widely in their preferences and capacity for participation in medical decision-making. This study aimed to document oncologist responses to more extreme presentations and identify helpful and unhelpful strategies for clinicians.

Patients And Methods: A trained actor played the role of a patient with early stage breast cancer who was attending her first consultation with a medical oncologist. She adopted in random order two different consultation participation styles: that of a very anxious, active patient, and that of a depressed, passive patient. Medical consultations between the actor and 16 medical oncologists were videotaped and then analysed qualitatively by two trained raters.

Results: Strategies that facilitated shared decision-making with both patient types and were positively endorsed by the actor/patient included explicit agenda-setting, active listening, checking understanding, endorsing question-asking, offering decisional delay, and non-verbal behaviours conveying empathy and warmth. Oncologists successfully negotiated with the active patient to share control of the consultation, and responded to emotional cues from the passive patient. Unhelpful strategies were also identified.

Conclusions: Few clinicians receive training in responding to differing communication styles in their patients that could potentially cause conflict and hinder optimal treatment decision-making. This study suggests some useful strategies for oncologists to consider, to widen their behavioural repertoire in the cancer consultation.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5060149PMC
http://dx.doi.org/10.1046/j.1369-6513.2002.00183.xDOI Listing
September 2002
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