NDLI: Comparative MRI analysis of T2 changes associated with single and repeated bouts of downhill running leading to eccentric-induced muscle damage.

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Comparative MRI analysis of T2 changes associated with single and repeated bouts of downhill running leading to eccentric-induced muscle damage.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Marqueste, Tanguy Giannesini, Benoit Fur, Yann Le Cozzone, Patrick J. Bendahan, David
Description	Country affiliation: France Author Affiliation: Marqueste T ( Centre de Résonance Magnétique Biologique et Médicale, Unite Mixte de Recherche (UMR) Centre National de la Recherche Scientifique (CNRS) 6612, Faculté de Médecine de Marseille, Marseille, France. tanguy.marqueste@univmed.fr)
Abstract	Although the exact mechanisms are still unclear, it is commonly acknowledged that acute eccentric exercise alters muscle performance, whereas the repetition of successive bouts leads to the disappearance of the deleterious signs. To clarify this issue, we measured blood creatine kinase and lactate dehydrogenase activities and proton transverse relaxation time (T2) in various leg muscles 72 h after single and repeated bouts of exhausting downhill running sessions (-15 degrees , 1.5 km/h) with either 4 or 7 days elapsed between bouts. After a single exercise bout, T2 and enzyme activities initially increased and recovered rapidly. When exercise bouts were repeated over a short time period (4 days), initial changes did not recover and endurance time throughout additional exercise sessions was significantly reduced. On the contrary, with a longer resting time between exercises (7 days), the endurance time of additional running sessions was significantly longer and muscle changes (T2 increase, muscle edema, and enzyme activity changes) slowly and completely reversed. Significant correlations were found between T2 changes and enzyme activities. T2 changes in the soleus and gastrocnemius muscle heads were differently affected by lengthening contractions, suggesting a muscle specificity and indicating that muscle alterations might be linked to different anatomical properties, such as fiber pennation angles, typology, and/or the exhausting nature of the downhill running sessions. We documented a 'less muscle injury' effect due to the repetition of exercise bouts at a low frequency (i.e., 1 session per week) in accordance with the delayed muscle inflammation. This effect was not observed when the between-exercise resting time was shorter.
File Format	HTM / HTML
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Issue Number	1
Volume Number	105
Language	English
Publisher	American Physiological Society
Publisher Date	2008-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Physiology Magnetic Resonance Imaging Muscle, Skeletal Injuries Physiology Animals Creatine Kinase Metabolism Electric Stimulation Enzymes Blood Hindlimb Image Processing, Computer-assisted Isometric Contraction L-lactate Dehydrogenase Linear Models Enzymology Rats, Sprague-dawley
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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