{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T14:37:13Z","timestamp":1770215833354,"version":"3.49.0"},"reference-count":44,"publisher":"American Veterinary Medical Association (AVMA)","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ajvr"],"published-print":{"date-parts":[[2008,6]]},"abstract":"<jats:title>Abstract<\/jats:title>\n<jats:p><jats:bold>Objective<\/jats:bold>\u2014To determine insulin sensitivity, proportions of muscle fiber types, and activities of glycogenolytic and glycolytic enzymes in Belgians with and without polysaccharide storage myopathy (PSSM).<\/jats:p>\n<jats:p><jats:bold>Animals<\/jats:bold>\u201410 Quarter Horses (QHs) and 103 Belgians in which PSSM status had been determined.<\/jats:p>\n<jats:p><jats:bold>Procedures<\/jats:bold>\u2014To determine insulin sensitivity, a hyperinsulinemic euglycemic clamp (HEC) technique was used in 5 Belgians with PSSM and 5 Belgians without PSSM. Insulin was infused IV at 3 mU\/min\/kg for 3 hours, and concentrations of blood glucose and plasma insulin were determined throughout. An IV infusion of glucose was administered to maintain blood glucose concentration at 100 mg\/dL. Activities of glycogenolytic and glycolytic enzymes were assessed in snap-frozen biopsy specimens of gluteus medius muscle obtained from 4 Belgians with PSSM and 5 Belgians without PSSM. Percentages of type 1, 2a, and 2b muscle fibers were determined via evaluation of \u2265 250 muscle fibers in biopsy specimens obtained from each Belgian used in the aforementioned studies and from 10 QHs (5 with PSSM and 5 without PSSM).<\/jats:p>\n<jats:p><jats:bold>Results<\/jats:bold>\u2014Belgians with and without PSSM were not significantly different with respect to whole-body insulin sensitivity, muscle activities of glycogenolytic and glycolytic enzymes, or proportions of muscle fiber types. However, Belgians had an increased proportion of type 2a and decreased proportion of type 2b muscle fibers, compared with proportions in QHs, regardless of PSSM status.<\/jats:p>\n<jats:p><jats:bold>Conclusions and Clinical Relevance<\/jats:bold>\u2014PSSM in Belgians may be attributable to excessive glycogen synthesis rather than decreased glycogen utilization or enhanced glucose uptake into muscle cells.<\/jats:p>","DOI":"10.2460\/ajvr.69.6.818","type":"journal-article","created":{"date-parts":[[2008,6,2]],"date-time":"2008-06-02T12:26:36Z","timestamp":1212409596000},"page":"818-823","source":"Crossref","is-referenced-by-count":19,"title":["Insulin sensitivity in Belgian horses with polysaccharide storage myopathy"],"prefix":"10.2460","volume":"69","author":[{"given":"Anna M.","family":"Firshman","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stephanie 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