Exercise Metabolism in Nonobese Patients with Type 2 Diabetes Following the Acute Restoration of Normoglycaemia.
Journal of Diabetes Research
Hindawi Publishing Corporation
Copyright © 2017 Christopher J. Gaffney et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This study investigated how acute restoration of normoglycaemia affected energy metabolism during exercise in nonobese patients with type 2 diabetes. Six subjects (mean ± SEM) aged 56.2 ± 2.7 years, with a BMI of 24.5 ± 1.5 kg/m2 and a VO2 peak of 28.7 ml/kg/min, attended the lab on two randomised occasions for a four-hour resting infusion of insulin or saline, followed by 30 minutes cycling at 50% VO2 peak. During the 4 h resting infusion, there was a greater (P < 0.0001) reduction in blood glucose in insulin treatment (INS) (from 11.2 ± 0.6 to 5.6 ± 0.1 mmol/l) than in saline treatment/control (CON) (from 11.5 ± 0.7 to 8.5 ± 0.6 mmol/l). This was associated with a lower (P < 0.05) resting metabolic rate in INS (3.87 ± 0.17) than in CON (4.39 ± 0.30 kJ/min). During subsequent exercise, blood glucose increased significantly in INS from 5.6 ± 0.1 at 0 min to 6.3 ± 0.3 mmol/l at 30 min (P < 0.01), which was accompanied by a lower blood lactate response (P < 0.05). Oxygen uptake, rates of substrate utilization, heart rate, and ratings of perceived exertion were not different between trials. Insulin-induced normoglycaemia increased blood glucose during subsequent exercise without altering overall substrate utilization.
All experiments completed as part of this study comply with the laws at the time of experimentation in the United Kingdom. This work was supported by the Arthritis Research UK (ARUK) and the Medical Research Council (MRC). The authors thank the members of the Human Physiology Group, MRC/ARUK Centre for Musculoskeletal Ageing Research, the University of Nottingham for technical assistance, and Dr Catherine J Wills for clinical input on study days. Christopher J. Gaffney, Peter Mansell, Ian A. Macdonald, and Kostas Tsintzas are part of the MRC/ ARUK Centre for Musculoskeletal Ageing Research, The University of Nottingham.
This is the final version of the article. Available from Hindawi Publishing Corporation via the DOI in this record.
Vol. 2017, pp. 8248725 -
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