The effect of hypoxia and work intensity on insulin resistance in type 2 diabetes

MacKenzie, R., Elliott, B., Maxwell, N.S., Brickley, G. and Watt, P.W. 2012. The effect of hypoxia and work intensity on insulin resistance in type 2 diabetes. Journal of Clinical Endocrinology & Metabolism. 97 (1), pp. 155-62. doi:10.1210/jc.2011-1843

TitleThe effect of hypoxia and work intensity on insulin resistance in type 2 diabetes
AuthorsMacKenzie, R., Elliott, B., Maxwell, N.S., Brickley, G. and Watt, P.W.
Abstract

Context:

Hypoxia and muscle contraction stimulate glucose transport in vitro. We have previously demonstrated that exercise and hypoxia have an additive effect on insulin sensitivity in type 2 diabetics.
Objectives:

Our objective was to examine the effects of three different hypoxic/exercise (Hy Ex) trials on glucose metabolism and insulin resistance in the 48 h after acute hypoxia in type 2 diabetics.
Design, Participants, and Interventions:

Eight male type 2 diabetics completed 60 min of hypoxic [mean (sem) O2 = ∼14.7 (0.2)%] exercise at 90% of lactate threshold [Hy Ex60; 49 (1) W]. Patients completed an additional two hypoxic trials of equal work, lasting 40 min [Hy Ex40; 70 (1) W] and 20 min [Hy Ex20; 140 (12) W].
Main Outcome Measures:

Glucose rate of appearance and rate of disappearance were determined using the one-compartment minimal model. Homeostasis models of insulin resistance (HOMAIR), fasting insulin resistance index and β-cell function (HOMAβ-cell) were calculated at 24 and 48 h after trials.
Results:

Peak glucose rate of appearance was highest during Hy Ex20 [8.89 (0.56) mg/kg · min, P < 0.05]. HOMAIR and fasting insulin resistance index were improved in the 24 and 48 h after Hy Ex60 and Hy Ex40 (P < 0.05). HOMAIR decreased 24 h after Hy Ex20 (P < 0.05) and returned to baseline values at 48 h.
Conclusions:

Moderate-intensity exercise in hypoxia (Hy Ex60 and Hy Ex40) stimulates acute- and moderate-term improvements in insulin sensitivity that were less apparent in Hy Ex20. Results suggest that exercise duration and not total work completed has a greater influence on acute and moderate-term glucose control in type 2 diabetics.

JournalJournal of Clinical Endocrinology & Metabolism
Journal citation97 (1), pp. 155-62
ISSN1945-7197
Year2012
PublisherEndocrine Society
Digital Object Identifier (DOI)doi:10.1210/jc.2011-1843
Publication dates
Published12 Oct 2011

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