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Introduction Diagnosing a concussion is challenging because of complex and variable symptoms. Establishing a viable biomarker of injury may rely on physiologic measurements rather than symptomology. Volatile organic compounds (VOCs) such as breath acetone have been identified as potential physiological markers that can capture changes in the utilization of energy substrates post-concussion. Here, we aimed to explore whether differences in VOCs exist between concussed and non-concussed athletes at the initial and later stages of injury recovery. Methods Six (N=6) non-concussed athletes were enrolled as control participants prior to the competitive season. Control participants' breath acetone, heart rate, and anthropometric measures were obtained at rest and throughout a single exercise challenge by breathalyzer. Six (N=6) athletes diagnosed with concussion during the competitive season had breath acetone measured daily until cleared to return to activity or approximately four weeks following enrollment where they participated in an exit exercise challenge having breath acetone, heart rate, and anthropometric measures obtained. Comparisons were made between at-rest measures of concussed and non-concussed participants at multiple time points during the recovery period. Paired t-test comparisons with individuals serving as their own control were used to determine individual differences in recovery. Visual graphs were used to demonstrate differences in obtained measures amongst individuals and between groups during the exercise challenges. Results Results demonstrated statistically significant differences in breath acetone between concussed and control participants when the highest day measured during the first week of concussion was compared to the control participant's resting values (P=0.017). Additionally, when the concussed participants served as their own control and their highest measured day of the first week post-concussion was compared to values when cleared to return to activity or at 26 days post-concussion, there was a significant difference in breath acetone (P=0.028). Comparing breath acetone during exercise between non-concussed and cleared concussed participants or four weeks post-injury, demonstrated no significant differences throughout the challenge or at rest prior. Visual graph comparisons in a single participant before and after concussion suggest differences may appear following exercise during the recovery period. Discussion These results suggest VOCs, particularly breath acetone, have the potential to serve as diagnostic markers of concussion. However, longitudinal research within larger cohorts and with equipment able to expel VOCs other than acetone from measures are needed to make informed recommendations.
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BACKGROUND: The Centers for Disease Control and Prevention (CDC) funds a quality improvement (QI) health promotion telewellness program for adults with physical disabilities. OBJECTIVE: The nutrition component of the parent program, Mindfulness, Exercise, and Nutrition to Optimize Resilience (MENTOR) program, from 2020 to 2021, was evaluated to assess changes in nutrition knowledge of people with physical disabilities. METHODS: This was a quasi-experimental program evaluation by pre-post survey of participating adults with physical disabilities. Participants attended weekly nutrition classes for eight weeks with optional one-on-one counseling with a Registered Dietitian. Participants completed pre-post General Nutrition Knowledge Questionnaire Revised (GNKQ-R) that were analyzed using paired t-tests. Participants were grouped into quartiles by pre-program GNKQ-R scores for additional comparisons. Program attendance and post-program feedback were also evaluated. RESULTS: A total of 286 participants completed the MENTOR program, and 31% (n = 89) completed pre-post questionnaires for data analysis. Mean pre-program GNKQ-R scores were 58.4 ± 15.1 and post scores were 64.4 ± 11.3, which demonstrated a statistically significant improvement in nutrition knowledge (p < .001). Ancillary analysis revealed that participants with the lowest quartile of pre-program nutrition knowledge had the greatest improvements in their post-GNKQ-R scores (Mean change 16.4 ± 13.9). Questionnaire data revealed participants' subjective knowledge changes and their feedback on the nutrition component of the program. CONCLUSIONS: The eight-week MENTOR program effectively improved nutrition knowledge among people with physical disabilities. This demonstrates the impact the program can have on individual knowledge levels. Additionally, these results support the implementation of the program to the broader population of people with disabilities.