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Topographical localization of muscle glycogen: an ultrahistochemical study in the human vastus lateralis
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Björn Ekblom's research group.ORCID iD: 0000-0002-4030-5437
1989 (English)In: Acta Physiologica Scandinavica, ISSN 0001-6772, E-ISSN 1365-201X, Vol. 135, 381-391 p.Article in journal (Refereed) Published
Abstract [en]

The fine structural pattern of glycogen storage in resting and sprint-exercised human vastus lateralis muscle fibres of different types was analysed using ultrahistochemical methods. Three male subjects (31-36 years) performed 60 consecutive, supramaximal bouts of bicycle exercise, each starting every 1 min and having a duration of 8 s (including approximately 3 s of acceleration). The load was estimated to correspond to 200% of VO2-max. Five other subjects (22-27 years) constituted controls. Ultrathin sections stained with periodic acid-thiosemicarbazide-silver proteinate (PA-TSC-SP) clearly revealed a compartmental distribution of glycogen. Glycogen is stored at five topographically, and probably also functionally, different locations. They are the subsarcolemmal, intermyofibrillar, para-Z-disc, N2-line, and H-zone spaces. During the exercise, glycogen from the N2-line and para-Z-disc locations is preferentially utilized. Serial sections stained with uranyl acetate and lead citrate demonstrated that glycogen stores of the type 2 fibres were more depleted than those of type 1 fibres. The implications of the differential intracellular glycogen storage are discussed

Place, publisher, year, edition, pages
1989. Vol. 135, 381-391 p.
National Category
Physiology
Identifiers
URN: urn:nbn:se:gih:diva-394OAI: oai:DiVA.org:gih-394DiVA: diva2:758
Available from: 2008-06-04 Created: 2008-06-04 Last updated: 2017-03-31Bibliographically approved

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