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In this White Paper, we outline recommendations from the perspective of health psychology and behavioural science, addressing three research gaps: (1) What methods in the health psychology research toolkit can be best used for developing and evaluating digital health tools? (2) What are the most feasible strategies to reuse digital health tools across populations and settings? (3) What are the main advantages and challenges of sharing (openly publishing) data, code, intervention content and design features of digital health tools? We provide actionable suggestions for researchers joining the continuously growing Open Digital Health movement, poised to revolutionise health psychology research and practice in the coming years. This White Paper is positioned in the current context of the COVID-19 pandemic, exploring how digital health tools have rapidly gained popularity in 2020-2022, when world-wide health promotion and treatment efforts rapidly shifted from face-to-face to remote delivery. This statement is written by the Directors of the not-for-profit Open Digital Health initiative (n = 6), Experts attending the European Health Psychology Society Synergy Expert Meeting (n = 17), and the initiative consultant, following a two-day meeting (19-20th August 2021).

The health care sector can benefit considerably from developments in digital technology. Consequently, eHealth applications are rapidly increasing in number and sophistication. For successful development and implementation of eHealth, it is paramount to guarantee the privacy and safety of patients and their collected data. At the same time, anonymized data that are collected through eHealth could be used in the development of innovative and personalized diagnostic, prognostic, and treatment tools. To address the needs of researchers, health care providers, and eHealth developers for more information and practical tools to handle privacy and legal matters in eHealth, the Dutch national Digital Society Research Programme organized the "Mind Your Data: Privacy and Legal Matters in eHealth" conference. In this paper, we share the key take home messages from the conference based on the following five tradeoffs: (1) privacy versus independence, (2) informed consent versus convenience, (3) clinical research versus clinical routine data, (4) responsibility and standardization, and (5) privacy versus solidarity., (©Catharina M L Zegers, Annemieke Witteveen, Mieke H J Schulte, Julia F Henrich, Anouk Vermeij, Brigit Klever, Andre Dekker. Originally published in JMIR Formative Research (http://formative.jmir.org), 17.03.2021.)

Objective: Irritable bowel syndrome (IBS) is a chronic disorder of brain-gut interaction. Previous studies suggest that mindfulness could be therapeutic for IBS patients, however no study has evaluated the effects of mindfulness-based cognitive therapy adapted for patients with IBS (MBCT-IBS). A 6-week MBCT-IBS course was designed to reduce symptoms and increase quality of life. This study aimed to evaluate the effects of MBCT-IBS and to investigate its therapeutic mechanisms in a randomized controlled trial., Method: Sixty-seven female patients with IBS were randomized to MBCT-IBS (MG; n = 36) or a waitlist (WL; n = 31) control condition. Patients completed standardized self-report measures of IBS symptom severity, IBS quality of life, maladaptive illness cognitions (catastrophizing, visceral anxiety sensitivity) and mindfulness at baseline, after 2 treatment sessions, at posttreatment, and at 6-week follow-up. Self-referential processing of illness and health was measured with an implicit association test (IAT)., Results: The MG reported significantly greater reductions in IBS symptoms ( p = .003) and improvements in quality of life ( p < .001) at follow-up compared with the WL. Changes in visceral anxiety sensitivity and pain catastrophizing at posttreatment and reductions in the IAT-score after 2 sessions combined with increases in nonjudgmental awareness at posttreatment mediated reductions in IBS symptoms., Conclusions: MBCT-IBS has the potential to reduce IBS symptoms and increase quality of life. MBCT-IBS may exert its effect on IBS symptoms via reducing maladaptive illness cognitions and activating changes in self-processing (reducing biases in self-referent processing of illness and health and increasing nonjudgmental awareness). (PsycINFO Database Record (c) 2020 APA, all rights reserved).

Objectives: Our study aimed to investigate differences in attentional control between patients with irritable bowel syndrome (IBS) and healthy participants and to examine the link between attentional control and IBS catastrophizing. Previous research has shown that patients with chronic functional illnesses have lower levels of attentional control. However, no previous study has found altered attentional control in patients with IBS or directly investigated the link between attentional control and catastrophizing. We also aimed to establish whether anxiety is associated with attentional functions in patients with IBS., Design and Methods: In this cross-sectional study, we compared 41 IBS patients with 39 healthy-matched control participants on attentional functions using an attention network task. IBS catastrophizing (Gastrointestinal Cognitions), IBS symptom severity (GSRS-IBS), Depression, Anxiety, and Stress (DASS-21), and Visceral Anxiety Sensitivity were assessed using self-report measures., Results: Patients with IBS had lower attentional control compared to healthy participants, t (78) = -2.75, p = .007, d = .62. Groups did not differ in alerting or orienting attention. IBS patients with lower attentional control scored higher on IBS catastrophizing than those with higher attention control, t (38.59) = 2.19, p = .032, d = .66. Anxiety was related to orienting attention in the IBS group (ρ = .38, p = .015)., Conclusions: Patients with IBS displayed reduced attentional control. Crucially, those patients with lower attentional control also had more catastrophizing thoughts than patients with better attentional control. These findings suggest that improving attentional control could be a valid target for psychological interventions for IBS. Statement of contribution What is already known on this subject? It has been hypothesised that psychological processes play a role in the maintenance of irritable bowel syndrome (IBS), and altered levels of attentional control have been found in patients with other functional illnesses but not yet in patients with IBS. Pain catastrophizing, a maladaptive thinking pattern, has been linked with IBS symptom severity, and previous research has shown an association between attentional control and intrusive thoughts. Whether there is an association between catastrophizing thoughts and attentional control in patients with IBS is unknown. What does this study add? Patients with irritable bowel syndrome show reduced levels of attentional control. IBS patients with lower levels of attentional control have more catastrophizing thoughts. Therapies emphasizing attentional control training may help reduce catastrophizing., (© 2018 The British Psychological Society.)

Objectives: Psychological interventions can alleviate the symptoms of irritable bowel syndrome (IBS) and psychological distress commonly reported among IBS sufferers. However, the theoretical underpinnings and intervention techniques used by such interventions vary considerably. This study aimed to identify which theoretical approaches and techniques lead to greater improvements in IBS symptoms and psychological well-being within psychological interventions for IBS., Methods: Outcome data were extracted from 48 randomized controlled trials testing psychological treatments for IBS. Theoretical intervention targets and intervention techniques of each study were identified. Cumulative effect sizes were calculated for pain, bowel dysfunction, composite symptom scores, psychological distress, and health-related quality of life. Comparative analyses contrasted the effect sizes of studies which included each intervention technique to those which did not., Results: Cumulatively, interventions significantly improved all outcomes, with effect sizes (Hedges' g) ranging from 0.32 to 0.64. Interventions which stated a theoretical intervention target, prompted self-monitoring of symptoms and cognitions, provided tailored feedback linking symptoms and cognitions, utilized problem solving or assertiveness training and provided general support had greater effects upon symptom and well-being outcomes than interventions which did not (all P<.05). Across all studies, improvements in psychological distress were associated with improvements in composite symptom scores (P<.01)., Conclusions: This study identifies a set of techniques associated with improvements in IBS symptoms and psychological well-being in existing interventions, and provides initial evidence for the link between improvements in psychological distress and IBS composite symptom scores. These findings can aid the development and refinement of psychological treatments for IBS., (Copyright © 2014 Elsevier Inc. All rights reserved.)