Effects of Ultratrail Running on Skeletal-Muscle Oxygenation Dynamics

Détails

ID Serval
serval:BIB_4470C488AF76
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Effects of Ultratrail Running on Skeletal-Muscle Oxygenation Dynamics
Périodique
International Journal of Sports Physiology and Performance
Auteur(s)
Vernillo G., Brighenti A., Limonta E., Trabucchi P., Malatesta D., Millet G. P., Schena F.
ISSN
1555-0273 (Online)
ISSN-L
1555-0265
Statut éditorial
Publié
Date de publication
04/2017
Peer-reviewed
Oui
Volume
12
Numéro
4
Pages
496-504
Langue
anglais
Notes
Vernillo, Gianluca
Brighenti, Alfredo
Limonta, Eloisa
Trabucchi, Pietro
Malatesta, Davide
Millet, Gregoire P
Schena, Federico
eng
2016/09/13 06:00
Int J Sports Physiol Perform. 2017 Apr;12(4):496-504. doi: 10.1123/ijspp.2015-0745. Epub 2016 Sep 6.
Résumé
PURPOSE: To quantify changes in skeletal-muscle oxygenation and pulmonary O2 uptake (VO2) after an extreme ultratrail running bout. METHODS: Before (PRE) and after (POST) the race (330-km, 24000 D+/-), profiles of vastus lateralis muscle oxygenation (ie, oxyhemoglobin [O2Hb], deoxyhemoglobin [HHb], and tissue oxygenation index [TOI]) and VO2 were determined in 14 athletes (EXP) and 12 control adults (CON) during two 4-min constant-load cycling bouts at power outputs of 1 (p1) and 1.5 (p1.5) W/kg performed in randomized order. RESULTS: At POST, normalized [HHb] values increased (p1, +38.0%; p1.5, +27.9%; P < .05), while normalized [O2Hb] (p1, -20.4%; p1.5, -14.4%; P < .05) and TOI (p1, -17.0%; p1.5, -17.7%; P < .05) decreased in EXP. VO2 values were similar (P > 0.05). An "overshoot" in normalized [HHb]:VO2 was observed, although the increase was significant only during p1.5 (+58.7%, P = .003). No difference in the aforementioned variables was noted in CON (P > .05). CONCLUSIONS: The concentric and, particularly, the eccentric loads characterizing this extreme ultratrail-running bout may have led to variations in muscle structure and function, increasing the local muscle deoxygenation profile and the imbalance between O2 delivery to working muscles and muscle O2 consumption. This highlights the importance of incorporating graded training, particularly downhill bouts, to reduce the negative influence of concentric and severe eccentric loads to the microcirculatory function and to enhance the ability of runners to sustain such loading.
Pubmed
Création de la notice
16/07/2017 8:52
Dernière modification de la notice
20/08/2019 13:48
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