Document Detail


Electrostimulation improves muscle perfusion but does not affect either muscle deoxygenation or pulmonary oxygen consumption kinetics during a heavy constant-load exercise.
MedLine Citation:
PMID:  17934756     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Electromyostimulation (EMS) is commonly used as part of training programs. However, the exact effects at the muscle level are largely unknown and it has been recently hypothesized that the beneficial effect of EMS could be mediated by an improved muscle perfusion. In the present study, we investigated rates of changes in pulmonary oxygen consumption (VO(2p)) and muscle deoxygenation during a standardized exercise performed after an EMS warm-up session. We aimed at determining whether EMS could modify pulmonary O(2) uptake and muscle deoxygenation as a result of improved oxygen delivery. Nine subjects performed a 6-min heavy constant load cycling exercise bout preceded either by an EMS session (EMS) or under control conditions (CONT). VO(2p) and heart rate (HR) were measured while deoxy-(HHb), oxy-(HbO(2)) and total haemoglobin/myoglobin (Hb(tot)) relative contents were measured using near infrared spectroscopy. EMS significantly increased (P < 0.05) the Hb(tot) resting level illustrating a residual hyperaemia. The EMS priming exercise did not affect either the HHb time constant (17.7 +/- 14.2 s vs. 13.1 +/- 2.3 s under control conditions) or the VO(2p) kinetics (time-constant = 18.2 +/- 5.2 s vs. 15.4 +/- 4.6 s under control conditions). Likewise, the other VO(2p) parameters were unchanged. Our results further indicated that EMS warm-up improved muscle perfusion through a residual hyperaemia. However, neither VO(2p) nor [HHb] kinetics were modified accordingly. These results suggest that improved O(2) delivery by residual hyperaemia induced by EMS does not accelerate the rate of aerobic metabolism during heavy exercise at least in trained subjects.
Authors:
Gwenael Layec; Grégoire P Millet; Aurélie Jougla; Jean-Paul Micallef; David Bendahan
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Publication Detail:
Type:  Journal Article     Date:  2007-10-13
Journal Detail:
Title:  European journal of applied physiology     Volume:  102     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2007-12-06     Completed Date:  2008-05-13     Revised Date:  2008-06-18    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  289-97     Citation Subset:  IM    
Affiliation:
Faculté de Médecine de Marseille, Centre de Résonance Magnétique Biologique et Médicale, UMR CNRS 6612, 27 Bd Jean Moulin, 13005, Marseille, France. gwenael.layec@medecine.univ-mrs.fr
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Adult
Aerobiosis
Bicycling / physiology
Electric Stimulation
Energy Metabolism / physiology
Exercise / physiology*
Exercise Test
Heart Rate
Hemoglobins / analysis,  metabolism
Humans
Hyperoxia / blood,  metabolism
Kinetics
Lung / blood supply,  metabolism
Male
Muscles / blood supply*,  physiology*
Myoglobin / analysis
Oxygen / analysis,  metabolism
Oxygen Consumption*
Oxyhemoglobins / analysis,  metabolism
Physical Fitness
Pulmonary Gas Exchange / physiology*
Pulmonary Ventilation
Spectroscopy, Near-Infrared
Chemical
Reg. No./Substance:
0/Hemoglobins; 0/Myoglobin; 0/Oxyhemoglobins; 7782-44-7/Oxygen; 9008-02-0/deoxyhemoglobin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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