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Erschienen in: European Journal of Applied Physiology 10/2018

26.07.2018 | Original Article

Delayed parasympathetic reactivation and sympathetic withdrawal following maximal cardiopulmonary exercise testing (CPET) in hypoxia

verfasst von: Alessandro Fornasiero, Aldo Savoldelli, Spyros Skafidas, Federico Stella, Lorenzo Bortolan, Gennaro Boccia, Andrea Zignoli, Federico Schena, Laurent Mourot, Barbara Pellegrini

Erschienen in: European Journal of Applied Physiology | Ausgabe 10/2018

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Abstract

Purpose

This study investigated the effects of acute hypoxic exposure on post-exercise cardiac autonomic modulation following maximal cardiopulmonary exercise testing (CPET).

Methods

Thirteen healthy men performed CPET and recovery in normoxia (N) and normobaric hypoxia (H) (FiO2 = 13.4%, ≈ 3500 m). Post-exercise cardiac autonomic modulation was assessed during recovery (300 s) through the analysis of fast-phase and slow-phase heart rate recovery (HRR) and heart rate variability (HRV) indices.

Results

Both short-term, T30 (mean difference (MD) 60.0 s, 95% CI 18.2–101.8, p = 0.009, ES 1.01), and long-term, HRRt (MD 21.7 s, 95% CI 4.1–39.3, p = 0.020, ES 0.64), time constants of HRR were higher in H. Fast-phase (30 and 60 s) and slow-phase (300 s) HRR indices were reduced in H either when expressed in bpm or in percentage of HRpeak (p < 0.05). Chronotropic reserve recovery was lower in H than in N at 30 s (MD − 3.77%, 95% CI − 7.06 to − 0.49, p = 0.028, ES − 0.80) and at 60 s (MD − 7.23%, 95% CI − 11.45 to − 3.01, p = 0.003, ES − 0.81), but not at 300 s (p = 0.436). Concurrently, Ln-RMSSD was reduced in H at 60 and 90 s (p < 0.01) but not at other time points during recovery (p > 0.05).

Conclusions

Affected fast-phase, slow-phase HRR and HRV indices suggested delayed parasympathetic reactivation and sympathetic withdrawal after maximal exercise in hypoxia. However, a similar cardiac autonomic recovery was re-established within 5 min after exercise cessation. These findings have several implications in cardiac autonomic recovery interpretation and in HR assessment in response to high-intensity hypoxic exercise.
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Metadaten
Titel
Delayed parasympathetic reactivation and sympathetic withdrawal following maximal cardiopulmonary exercise testing (CPET) in hypoxia
verfasst von
Alessandro Fornasiero
Aldo Savoldelli
Spyros Skafidas
Federico Stella
Lorenzo Bortolan
Gennaro Boccia
Andrea Zignoli
Federico Schena
Laurent Mourot
Barbara Pellegrini
Publikationsdatum
26.07.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Applied Physiology / Ausgabe 10/2018
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-018-3945-5

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