Pilot study shows tighter cardiorespiratory coupling with increased workload in adolescent athletes, indicating heart rate variability changes.
was unchanged. X-Corr increased from 50 to 110/140 W (p ≤ 0.0014). JSD indices decreased as workload increased (SE: global p = 0.139; CSE: global p = 0.029), suggesting tighter CRC. CRC becomes more pronounced with increased workload, aligning with reduced heart rate variability and reflecting vagal withdrawal and reflex responses that improve heart-lung integration in adolescent athletes.
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Avila-Gutierrez et al. (2026) studied this question.
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