A small mixed-method RCT of mindfulness instruction for urban youth.

OBJECTIVE: We aimed to explore the specific effects of mindfulness-based stress reduction (MBSR) for urban youth by comparing it with an active control program, designed to control for time, positive peer-group experience, and positive adult instructor. METHODS: Patients between the ages of 13-21 years who received primary pediatric care at our urban outpatient clinic were eligible for study participation. Those who were interested were consented and randomly assigned to an eight-week program of MBSR or Healthy Topics (HT), a health education curriculum. To increase sensitivity to outcomes of interest, mixed methods were used to assess psychological symptoms, coping, and program experience. Analysis of variance and regression modeling were used; interviews were audio-taped, transcribed, and coded for key themes. RESULTS: A total of 43 (26 MBSR, 17 HT) youths attended one or more sessions, of whom 35 [20 MBSR (77%), 15 HT (88%)] attended the majority of the sessions and were considered completers. Program completers were African American, 80% female, with average age of 15.0 years. Statistical analysis of survey data did not identify significant post-program differences between groups. Qualitative data show comparable positive experiences in both programs, but specific differences related to MBSR participants׳ use of mindfulness techniques to calm down and avoid conflicts, as well as descriptions of internal processes and self-regulation. CONCLUSIONS: Compared with an active control program, MBSR did not result in statistically significant differences in self-reported survey outcomes of interest but was associated with qualitative outcomes of increased calm, conflict avoidance, self-awareness, and self-regulation for urban youths. Importantly, based on qualitative results, the HT program functioned as an effective active control for MBSR in this sample, facilitating a more rigorous methodological approach to MBSR research in this population. We believe the promising effects elucidated in the qualitative data have the potential for positive affective and behavioral outcomes.

Development of an ex vivo protocol to model bone fracture in laying hens resulting from collisions.

Fractures of the keel bone, a bone extending ventrally from the sternum, are a serious health and welfare problem in free range laying hens. Recent findings suggest that a major cause of keel damage within extensive systems is collisions with internal housing structures, though investigative efforts have been hindered by difficulties in examining mechanisms and likely influencing factors at the moment of fracture. The objectives of this study were to develop an ex vivo impact protocol to model bone fracture in hens caused by collision, to assess impact and bird-related factors influencing fracture occurrence and severity, and to identify correlations of mechanical and structural properties between different skeletal sites. We induced keel bone fractures in euthanized hens using a drop-weight impact tester able to generate a range of impact energies, producing fractures that replicate those commonly found in commercial settings. The results demonstrated that impact energies of a similar order to those expected in normal housing were able to produce fractures, and that greater collision energies resulted in an increased likelihood of fractures and of greater severity. Relationships were also seen with keel's lateral surface bone mineral density, and the peak reactive force (strength) at the base of the manubrial spine. Correlations were also identified between the keel and long bones with respect to both strength and bone mineral density. This is the first study able to relate impact and bone characteristics with keel bone fracture at the moment of collision. Greater understanding of these relationships will provide means to reduce levels of breakage and severity in commercial systems.