Wearable monitoring devices are an innovative way to measure heart rate (HR) and heart rate variability (HRV), however, there is still debate about the validity of these wearables. This study aimed to validate the accuracy and predictive value of the Empatica E4 wristband against the VU University Ambulatory Monitoring System (VU-AMS) in a clinical population of traumatized adolescents in residential care. A sample of 345 recordings of both the Empatica E4 wristband and the VU-AMS was derived from a feasibility study that included fifteen participants. They wore both devices during two experimental testing and twelve intervention sessions. We used correlations, cross-correlations, Mann-Whitney tests, difference factors, Bland-Altman plots, and Limits of Agreement to evaluate differences in outcomes between devices. Significant correlations were found between Empatica E4 and VU-AMS recordings for HR, SDNN, RMSSD, and HF recordings. There was a significant difference between the devices for all parameters but HR, although effect sizes were small for SDNN, LF, and HF. For all parameters but RMSSD, testing outcomes of the two devices led to the same conclusions regarding significance. The Empatica E4 wristband provides a new opportunity to measure HRV in an unobtrusive way. Results of this study indicate the potential of the Empatica E4 as a practical and valid tool for research on HR and HRV under non-movement conditions. While more research needs to be conducted, this study could be considered as a first step to support the use of HRV recordings provided by wearables.

Residential care is among the most intensive forms of treatment in youth care. It serves youths with severe behavioral problems and is primarily focused on targeting externalizing problems. Despite best efforts, effect sizes remain moderate, which may be due to the disregarding of internalizing symptoms – in particular anxiety - and to limitations regarding the delivery model of interventions. This initial randomized controlled trial (n = 37) aimed to examine the effectiveness of a biofeedback videogame intervention (Dojo) as an addition to treatment as usual for youths with and without intellectual disability (ID) in residential care with clinical levels of anxiety and externalizing problems. Dojo targets both anxiety and externalizing problems, and incorporates the principles of conventional treatment, while addressing its limitations. Youths were randomly assigned to play Dojo (eight 30-min gameplay sessions) or to treatment as usual (TAU). Measurements of anxiety and externalizing problems were conducted at baseline, posttreatment, and 4-months follow-up through youths’ self-report and mentor-report. Completers-only analyses revealed decreases in self-reported anxiety and externalizing problems, and mentor-reported anxiety at posttreatment for participants in the Dojo condition compared to the control condition. Only mentor-reported anxiety was maintained at follow-up. No effect was found for mentor-reported externalizing problems. These findings provided preliminary evidence that Dojo is a promising, innovative intervention that engages high-risk youths. Practical implications are discussed.

AimMany youth in residential care suffer from post‐traumatic symptoms that have adverse effects on a range of psychological, behavioural and physiological outcomes. Although current evidence‐based treatment options are effective, they have their limitations. Meditation interventions are an alternative to traditional trauma‐focused treatment. This pilot study aimed to evaluate three game‐based meditation interventions in a sample of traumatized youth in residential care.MethodsFifteen participants were randomly divided over three conditions (Muse, DayDream and Wild Divine) that all consisted of twelve 15‐minute game‐play sessions. Physiological measurements (heart rate variability) were conducted at baseline, post‐treatment and during each intervention session. Post‐traumatic symptoms, stress, depression, anxiety and aggression were assessed at baseline, post‐treatment and 1‐month follow‐up.ResultsPhysiological stress regulation was improved during the meditation sessions of all three interventions. User evaluations were in particular high for Muse with a rating of 8.42 out of 10 for game evaluation. Overall, outcomes on psychopathology demonstrated the most robust effect on stress. Muse performed best, with all participants showing reliable improvements (reliable change indexes [RCIs]) in post‐traumatic symptoms, stress and anxiety. Participants who played Daydream or Wild Divine showed inconsistent progression: some participants improved, whereas others remained stable or even deteriorated based on their RCIs.ConclusionsPreliminary findings show promising outcomes on physiology, psychopathology and user evaluations. All indicate the potential of this innovative form of stress regulation intervention, and the potential of Muse in particular, although findings should be considered preliminary due to our small sample size. Further studies are warranted to assess intervention effectiveness effects of Muse or other game‐based meditation interventions for traumatized youth.