Design and evaluate a biofeedback intervention to improve autonomic regulation in athletes

Thesis Abstract

Autonomic regulation plays a critical role in athletes' physiological readiness and recovery, yet many athletes exhibit dysregulated autonomic responses that impair performance and increase susceptibility to overtraining and injury. This study investigates the design and empirical evaluation of a comprehensive biofeedback intervention aimed at enhancing autonomic nervous system balance among competitive athletes. The primary objectives are to develop a tailored biofeedback protocol integrating heart rate variability (HRV) training, respiratory control, and mindfulness practices, and to assess its efficacy in improving autonomic regulation, psychological resilience, and athletic performance. The research adopts a quasi-experimental, pretest-posttest control group design with a mixed-methods approach. The study population comprises 120 competitive athletes aged 18–30 years from a national sports training center, with 60 in the intervention group and 60 in the control group. Participants are randomly assigned within stratified layers based on sport type and competition level. Data collection instruments include standardized HRV measurement devices, validated psychological resilience scales, and performance metrics specific to each sport. Validity and reliability of instruments are established through pilot testing and adherence to established psychometric standards. The intervention spans eight weeks, with sessions conducted thrice weekly, and adherence monitored through session logs. Quantitative data are analyzed using repeated-measures ANOVA to assess differences in HRV parameters, resilience scores, and performance metrics over time between the groups. Regression analysis explores potential predictors of autonomic regulation improvement, while thematic analysis of semi-structured interviews provides qualitative insights into participant experiences and perceived benefits. The theoretical framework integrates the Polyvagal Theory to underpin the physiological mechanisms of autonomic regulation and the Self-Determination Theory to interpret motivational aspects influencing adherence. Anticipated findings suggest that athletes undergoing the biofeedback intervention will demonstrate statistically significant improvements in HRV indices indicative of enhanced parasympathetic activation, increased resilience scores, and measurable performance gains, compared to controls. These results are expected to substantiate the efficacy of targeted biofeedback modalities in promoting autonomic stability, psychological wellbeing, and athletic output. This research contributes novel empirical evidence to the limited body of knowledge on biofeedback interventions tailored for athletic populations, emphasizing the integration of physiological, psychological, and performance domains. The study highlights the potential for incorporating biofeedback training into regular athletic preparation regimes to optimize autonomic functioning and resilience. The main conclusion posits that structured biofeedback, grounded in established physiological and psychological theories, can serve as an effective modality for autonomic regulation in athletes. Recommendations include adopting biofeedback protocols as standard practice within sports training programs, training sports psychologists and coaches in biofeedback techniques, and further longitudinal research to validate lasting effects. Future studies are suggested to explore dose-response relationships, individual differences in responsiveness, and integration with other psychological interventions to maximize athletic performance and health outcomes.