The goal of this randomized controlled trial is to test whether a brief digital mindset training program can improve performance among recreational runners training for a half marathon in New Zealand in 2025. The study will recruit healthy adult participants who are registered for an upcoming half-marathon event. The study aims to answer two main questions: 1. Does the mindset training program - designed to reframe common physical symptoms like fatigue or muscle soreness as signs of progress - help more runners complete the race and improve their official times, compared to standard training advice? 2. Does it support better training (e.g., longer peak training weeks) and faster physical recovery after the race? Researchers will compare participants who receive the mindset training program to those who receive widely followed half-marathon training content and a group who receive no study content, to see whether the mindset training leads to better half-marathon performance and training outcomes. Participants will: * Complete a brief online survey at the start of the study * Receive and engage with four pieces of digital content across nine weeks before the half-marathon race (if assigned to a training group) * Complete a follow-up survey after the half-marathon
This randomized controlled trial evaluates whether a brief digital mindset intervention can improve performance and training outcomes among recreational runners training for a half marathon. The intervention is grounded in psychological theories of mindsets, expectation, placebo effects, and effort perception, which suggest that how individuals interpret physical symptoms during exercise-such as fatigue or muscle soreness-can influence motivation, persistence, and overall outcomes. The intervention aims to reframe mild physical symptoms experienced during training as signs of physiological adaptation rather than negative signals, helping participants develop more adaptive mindsets about effort and endurance. Intervention content includes brief digital modules that introduce the concept of meta-mindsets (beliefs about how mindsets influence experiences and outcomes) and provide applied strategies for interpreting discomfort as a normal and constructive part of the endurance training process. The digital modules are delivered over a nine-week period leading up to the participant's half marathon and are designed to be time-efficient and accessible. To ensure comparability, participants assigned to the active control group receive parallel-format digital modules that focus on widely followed training advice, without any mindset-related material. Participants in the control group do not receive digital content during the study period. All intervention content is delivered via the Intervengine platform or email. Participants are randomly assigned in a 1:1:1 ratio to one of three study arms. Randomization is conducted independently using a computer-generated allocation sequence. The study follows an intention-to-treat analysis approach, with additional per-protocol analyses among participants who complete the intervention and race. Statistical analyses will include ANOVA and mixed-model approaches to assess group differences in primary and secondary outcomes over time. Missing data will be addressed using multiple imputation techniques. All eligibility criteria, outcome measures, and intervention details are specified in the relevant sections of the clinical trial registration record. This trial contributes to a growing body of research examining scalable psychological interventions that support physical activity adherence and performance. It explores whether brief mindset-focused training can enhance endurance outcomes in real-world, non-clinical athletic contexts.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
SUPPORTIVE_CARE
Masking
NONE
Enrollment
207
The mindset intervention includes 4 brief digital modules over 9 weeks (once every 3 weeks) via app or email, prior to the half-marathon race. The content introduces meta-mindsets (beliefs about how mindsets shape experiences and outcomes) and reframes non-severe physical symptoms (e.g., muscle soreness, fatigue) as signs of physiological adaptation. Modules cover: (1) what mindsets are and how they affect performance; (2) how to interpret normal training symptoms as positive signals; (3) how to maintain adaptive mindsets during peak training; and (4) race-day mindset preparation. Each module includes brief text, visuals, and reflection questions and takes approximately five minutes to complete.
The marathon performance training intervention includes 4 brief digital modules over 9 weeks (once every 3 weeks) via app or email, prior to the half-marathon race. Content is based on publicly available half-marathon training guidance and excludes any mindset-related material. Modules cover: (1) setting race goals and structuring training plans; (2) training tips and best practices (e.g., pacing, injury prevention); (3) navigating peak training periods (e.g., distance increases, rest and recovery); and (4) practical race-day preparation strategies (e.g., pacing, fueling, warm-up routines). Each module includes concise text, visuals, and actionable tips designed to take approximately five minutes to complete.
Faculty of Medical and Health Sciences, University of Auckland
Auckland, New Zealand
RECRUITINGOfficial Race Times
The primary study outcome is the official half-marathon finish time recorded for each participant (in hours, minutes, and seconds)
Time frame: At half-marathon race completion (approximately 9 weeks after intervention start)
Race Completion
Number of participants who complete a half marathon, across each study arm.
Time frame: At half-marathon race completion (approximately 9 weeks after intervention start)
Race Recovery
Number of days it took participants to feel fully recovered from their half-marathon race. For example, when fatigue and muscle pain subsided.
Time frame: 1-week post-race (self-reported number of days to recover since race day)
Peak Training Week Run Frequency
The number of days each participant ran during their peak training week before the half-marathon race. Measured with the question: During your peak training week, how many days did you train? (days/week)
Time frame: 1-week post-race (reflecting participant-identified peak training week, usually 3-4 weeks before race day)
Peak Training Week - Total Distance Run
The total distance (in kilometers) that each participant ran across all training runs during their peak training week prior to the half-marathon race. Measured with the question: During your peak training week, what was the total distance you ran across all your runs that week? (km)
Time frame: 1-week post-race (reflecting participant-identified peak training week, usually 3-4 weeks before race day)
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