What question did this study set out to answer?

To examine how cardiorespiratory coupling (CRC) is affected by workload during graded exercise in adolescent athletes.

April 29, 2026Physiological Reports0 citationsOpen Access

Cardiorespiratory coupling tightens with workload during graded exercise: A pilot study with adolescent athletes

LALizeth Avila-GutierrezUniversidad Autónoma del Estado de México EAEric Alonso Abarca‐Castro AKAshuin Kammar‐García

Key Points

To examine how cardiorespiratory coupling (CRC) is affected by workload during graded exercise in adolescent athletes.
Pilot study involving adolescent athletes during graded exercise.
Measured cardiorespiratory coupling and heart rate variability at different workloads.
Analyzed changes in X-Corr and JSD indices to assess CRC.
Statistical analysis included significance testing for workload differences.
X-Corr increased significantly from 50 to 110/140 W; p ≤ 0.0014.
JSD indices decreased with increased workload, indicating tighter CRC.
Heart rate variability was reduced, suggesting a physiological response to increasing workloads.

Abstract

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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