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Date publication
février 2018
Journal
International journal of sports medicine
Auteurs
Membres identifiés du Cancéropôle Est :
Pr TORDI Nicolas
Tous les auteurs :
Rakobowchuk M, Isacco L, Ritter O, Represas AG, Bouhaddi M, Degano B, Tordi N, Mourot L
Lien Pubmed
Résumé
Muscle deoxygenation responses provide information about the training impulse of an exercise session enabling adaptation to be predicted. Our aim was to investigate muscle oxygenation profiles during prolonged low-intensity eccentric and concentric cycling. Twelve healthy men performed two 45-min exercise sessions of concentric (CON) and eccentric (ECC) cycling, matched for the same heart rate at the start of each session. Mechanical power output during ECC was ~2.5 times that of CON (210±40 W vs. 82±16 W). Oxygen uptake, blood lactate, cardiac output and systolic arterial pressure responses did not differ between exercises. Heart rate was similar at 5 min of each exercise bout but progressively increased during ECC and was higher at 15, 30 and 45 min of ECC compared to CON (+10 bpm), with a trend for a lower stroke volume. Diastolic and mean blood pressures were higher during ECC. No significant differences were observed in muscle oxygenation profiles. Muscle oxygenation responses during prolonged low-intensity exercise were not affected by the type of muscle action at the same metabolic demand and cardiac output.
Mots clés
Adult, Bicycling, physiology, Blood Pressure, physiology, Exercise Test, methods, Heart Rate, physiology, Humans, Lactic Acid, blood, Male, Muscle, Skeletal, blood supply, Oxygen Consumption, physiology, Stroke Volume, physiology
Référence
Int J Sports Med. 2018 Feb;39(3):173-180
