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Insulin and contraction increase nutritive blood flow in rat muscle in vivo: determined by microdialysis of L-[14C]glucose


Newman, JMB and Ross, RM and Richards, SM and Clark, MG and Rattigan, S, Insulin and contraction increase nutritive blood flow in rat muscle in vivo: determined by microdialysis of L-[14C]glucose, Journal of Physiology, 585, (1) pp. 217-229. ISSN 0022-3751 (2007) [Refereed Article]

DOI: doi:10.1113/jphysiol.2007.138818


In the present study, a mathematical model using the microdialysis outflow: inflow (O/I) ratio of the novel analogue L-[14 C]glucose has been developed which allows the calculation of the nutritive (and non-nutritive) flow in muscle as a proportion of total blood flow. Anaesthetized rats had microdialysis probes carrying L[14C]glucose inserted through a calf muscle group (tibialis/ plantaris/gastrocnemius). The nutritive fraction of total blood flow was determined under basal conditions and in response to contraction (electrical field stimulation), insulin (hyperinsulinaemic euglycaemic clamp with 10 mU min-1 kg-1 insulin) or saline control from limb blood flow and the microdialysis O/I ratio of L[14C]glucose. Both contraction and insulin infusion decreased the O/I ratio of L[14C]glucose and increased total limb blood flow. Calculations based on mathematical models using L[14C]glucose O/I and limb blood flow revealed that during basal conditions, the nutritive fraction of total flow was 0.38 ± 0.06, indicating that basal flow was predominantly non-nutritive. Contraction and insulin increased the nutritive fraction to 0.82 ± 0.24 (P < 0.05) and 0.52 ± 0.12 (P < 0.05). Thus the increase in limb blood flow from insulin was fully accommodated by nutritive flow, while contraction increased nutritive flow at the expense of non-nutritive flow. This novel method using microdialysis and the O/I ratio of L[14C]glucose allows the determination of the nutritive fraction of total flow in muscle as well as the proportion of total flow that may be redistributed in response to contraction and insulin. © 2007 The Authors. Journal compilation © 2007 The Physiological Society.

Item Details

Item Type:Refereed Article
Research Division:Biomedical and Clinical Sciences
Research Group:Clinical sciences
Research Field:Endocrinology
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Newman, JMB (Dr John Newman)
UTAS Author:Ross, RM (Dr Renee Ross)
UTAS Author:Richards, SM (Dr Stephen Richards)
UTAS Author:Clark, MG (Professor Michael Clark)
UTAS Author:Rattigan, S (Professor Stephen Rattigan)
ID Code:49792
Year Published:2007
Web of Science® Times Cited:14
Deposited By:Biochemistry
Deposited On:2007-08-01
Last Modified:2016-02-18

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