Jacobs Journal of Physiotherapy and Exercise Evaluation of Autonomic Function after Concentric and Eccentric Cycling Exercise at Different Pedalling Frequencies
Résumé
Compared to concentric exercise, eccentric cycling is characterized by a lower cardiovascular and metabolic cost. However, its effects on the autonomic nervous system and the effects of pedalling frequency are little known. Eleven healthy subjects participated in this study. Cardiorespiratory variables were assessed during concentric and eccentric cycling performed with 3 different pedalling frequencies and post-exercise parasympathetic reactivation (heart rate recovery during the first 60 seconds of recovery and its normalized value; HRR60 and nHRR60) was studied. Cardiorespiratory responses were significantly lower during eccentric than concentric cycling. Heart rate recovery metrics were lower after eccentric than concentric cycling. In particular nHRR60 was 0.19 ± 0.11 vs 0.26 ± 0.11, after eccentric vs concentric exercise at 30 revolutions per minute respectively; 0.13 ± 0.22 vs 0.28 ± 0.11 at 40 rpm and; 0.12 ± 0.14 vs 0.26 ± 0.10 at 60 rpm showing an attenuated post-exercise parasympathetic reactivation after eccentric exercise. While no change was observed during concentric exercise, increasing the pedalling frequencies lowered the cardiopulmonary solicitation during eccentric cycling. A trend for a delayed post-exercise parasympathetic reactivation was also observed when the pedalling frequency increased (p = 0.057). These results highlighted that eccentric cycling imposed a greater strain on the autonomic nervous system than concentric cycling at the same power output despite a lower cardiorespiratory requirement.
Mots clés
Heart Rate Recovery Parasympathetic Reactivation Cardiorespiratory Requirement ANS: Autonomic Nervous System CON: Concentric ECC: Eccentric EEHR: End of Exercise HR HR: Heart Rate HRR: Heart Rate Recovery
Heart Rate Recovery
Parasympathetic Reactivation
Cardiorespiratory Requirement ANS: Autonomic Nervous System
CON: Concentric
ECC: Eccentric
EEHR: End of Exercise HR
HR: Heart Rate
HRR: Heart Rate Recovery
Domaines
Sciences du Vivant [q-bio]Origine | Fichiers produits par l'(les) auteur(s) |
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