Acceptance and Commitment Therapy for Older Adults

This study aims to investigate whether Acceptance and Commitment Therapy (ACT) is an effective psychotherapeutic intervention for older adults experiencing psychological distress; what processes contribute towards psychological change; and what adaptations may be required to optimise ACT for older adults. There is currently an over-reliance on pharmacological treatments to manage older adult mental health (Andreescu \& Reynolds, 2011), and a lack of inclusion of older adult in efficacy studies of psychological treatments (Gatz, 2006). Cognitive behaviour therapy (CBT) is the most evidence-based psychological treatment for mental health conditions. It emphasises the link between thoughts and feelings, and uses cognitive restructuring to facilitate improvement in psychological symptoms. However, of the studies that have included older adults, there is evidence that CBT has a lower effect size in older adults than with working age adults (Kishita \& Laidlaw, 2017). There are a number of possible reasons for this, including a lack of age specific adaptations, the over focus on diagnosis specific treatment protocols in CBT, and the increasing physical and psychological co-morbidity associated ageing.

ACT is a trans-diagnostic approach which aims to promote better living by supporting clients through six key processes (e.g. mindfulness, values). ACT does not aim to reduce distress, rather its goal is to promote better living or a better quality of life despite distress (Hayes, Strosahl \& Wilson, 1999). ACT has been shown to have equal or superior efficacy to CBT with a number of psychological and physical health conditions (A-Tjak et al., 2015; Ruiz, 2012). We propose that ACT would be especially suitable for older adult clients due to the high rate of co-morbidity older adults experience and the reduced ability to change aspects of these.

However, there is a lack of understanding about the processes by which ACT works (Öst, 2014). Randomised controlled trails (RCTs) are the standard research methodology to investigate psychotherapy efficacy. Due to the stringent criteria required for RCT analyses, there is a limit to how transferrable the findings of an RCT can be to clinical populations (i.e. heterogenous groups). As such, a hermeneutic single case efficacy design (HSCED) is an ideal methodology to employ to identify what contributes towards change for each client. HSCED benefits from high ecological validity, whilst actively focusing on non-specific factors (components common to all psychotherapies, e.g., therapeutic alliance) and extra-therapeutic factors (components that are not related to the therapy, usually participant factors) to delineate change processes.

The research proposal has been developed as part of a Doctoral Thesis in Clinical Psychology. This involved various research presentations panels and submission of an initial research protocol. These are designed to guide the decision-making process and gain feedback from the course research team. As part of the doctoral program, each trainee is allocated a Primary and Secondary Research Supervisor (both Clinical Psychologists), who aided in shaping the practicalities of this research proposal. Each project also recruits a Field Supervisor who supports with expertise in the project area. Participants will be recruited from the service the Field Supervisor is employed at, thereby creating a direct level of clinical supervision that is paramount to psychotherapy.

Participants will be informed about the study through a member of their healthcare team. The service will ensure potential participants have the capacity to consent to treatment and will provide them with an overview of the study. Potential participants will be made aware of informed consent; that they do not have to take part and that declining to take part will in no way affect their treatment from the service. If a participant declines to take part at this stage, they will be offered treatment as usual from the service. If they consent to take part, the researcher will contact them the following week to answer any additional questions. This will allow them sufficient time to consider whether they would like to take part or not.

This research aims to use a sample that is representative of older adults presenting with psychological distress. See Inclusion/Exclusion sections for further explanation of these criteria.

This study aims to reflect usual clinical practice where possible; therefore, the burden to participants will be of a similar level to treatment as usual. That is, they will be expected to attend the older adults service for regular one-to-one psychotherapy and to discuss their mental health difficulties, contributing factors and what is maintaining their difficulties. Thus, as with any psychological therapy, there is a potential risk that talking about distressing experiences will cause an increase in frequency or intensity of pre-existing mental health conditions. These risks will be monitored through the study by the Trainee Clinical Psychologist (who is both researcher and therapist) through discussion with the participant, use of outcome measures and importantly by utilising weekly clinical supervision with the Clinical Psychologist at the service. This allows a space for any concerns to be raised and for the service to have clinical oversight of the participants.

The aspects of the study which are additional to usual practice are as follows: participants will be required to complete more questionnaires; and participants will be required to come in for an interview after the block of therapy has ended. Every effort has been made to reduce the burden these place upon participants. For instance, shorter questionnaires have been used where possible. Participants will also be asked about any adaptations required to complete questionnaires (e.g. larger font, someone completing questionnaires with them). Participants will be reimbursed for the aspects of the study which are additional to usual practice.

There are several potential benefits to participants taking part in this research, as suggested by the ACT literature. These include decreased psychological distress, increased psychological flexibility and improved quality of life.

To ensure confidentiality, Participant Study Numbers (PSN) will be assigned to each participant to correspond with treatment data. PSNs will be listed in the Trial Recruitment Log along with participant's name, date of birth and NHS number. All other documents related to the participant will use the PSN only. All researchers will endeavour to protect the rights of the participants to privacy and will adhere to the Data Protection Act, 2018. Only the minimum required information for the purposes of the study will be collected. Participant information will be held securely, in a locked room, or locked cupboard or cabinet. Access to the information will be limited to the study staff and investigators. Computer held data including the study database will be held securely and password protected. All data will be stored on a secure dedicated web server. Access will be restricted by user identifiers and passwords (encrypted using a one-way encryption method). Information about the study in the participant's medical records / hospital notes will be treated confidentially in the same way as all other confidential medical information.

As the main researcher is also the therapist, potential conflict of interests will be managed by: using weekly clinical supervision; fortnightly ACT supervision; a 20% random sampling of the audio recorded sessions to ensure adherence to ACT techniques; and using an independent researcher to carry out the Change Interview. Another benefit of using a HSCED series, is that an independent panel adjudicates on the final outcome as to where change was attributed for each client, reducing the researcher-therapist bias.