NDLI: Progressive recruitment of muscle fibers is not necessary for the slow component of VO2 kinetics.

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Progressive recruitment of muscle fibers is not necessary for the slow component of VO2 kinetics.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zoladz, Jerzy A. Gladden, L. Bruce Hogan, Michael C. Nieckarz, Zenon Grassi, Bruno
Description	Country affiliation: Poland Author Affiliation: Zoladz JA ( Department of Physiology and Biochemistry, University School of Physical Education, Krakow, Poland.)
Abstract	The 'slow component' of O2 uptake (VO2) kinetics during constant-load heavy-intensity exercise is traditionally thought to derive from a progressive recruitment of muscle fibers. In this study, which represents a reanalysis of data taken from a previous study by our group (Grassi B, Hogan MC, Greenhaff PL, Hamann JJ, Kelley KM, Aschenbach WG, Constantin-Teodosiu D, Gladden LB. J Physiol 538: 195-207, 2002) we evaluated the presence of a slow component-like response in the isolated dog gastrocnemius in situ (n=6) during 4 min of contractions at approximately 60-70% of peak VO2. In this preparation all muscle fibers are maximally activated by electrical stimulation from the beginning of the contraction period, and no progressive recruitment of fibers is possible. Muscle VO2 was calculated as blood flow multiplied by arteriovenous O2 content difference. The muscle fatigued (force decreased by approximately 20-25%) during contractions. Kinetics of adjustment were evaluated for 1) VO2, uncorrected for force development; 2) VO2 normalized for peak force; 3) VO2 normalized for force-time integral. A slow component-like response, described in only one muscle out of six when uncorrected VO2 was considered, was observed in all muscles when VO2/peak force and VO2/force-time were considered. The amplitude of the slow component-like response, expressed as a fraction of the total response, was higher for VO2/peak force (0.18+/-0.06, means+/-SE) and for VO2/force-time (0.22+/-0.05) compared with uncorrected VO2 (0.04+/-0.04). A progressive recruitment of muscle fibers may not be necessary for the development of the slow component of VO2 kinetics, which may be caused by the metabolic factors that induce muscle fatigue and, as a consequence, reduce the efficiency of muscle contractions.
File Format	HTM / HTML
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Issue Number	2
Volume Number	105
Language	English
Publisher	American Physiological Society
Publisher Date	2008-08-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Physiology Muscle Fibers, Skeletal Physiology Oxygen Consumption Recruitment, Neurophysiological Adenosine Triphosphate Metabolism Animals Electric Stimulation Energy Metabolism Kinetics Muscle Contraction Muscle Fatigue Muscle Fibers, Fast-twitch Muscle, Skeletal Blood Supply Cytology Regional Blood Flow Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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