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J Appl Physiol (1985). 2010 May;108(5):1034-40. doi: 10.1152/japplphysiol.00977.2009. Epub 2009 Dec 31.

A 2-wk reduction of ambulatory activity attenuates peripheral insulin sensitivity.

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1
Centre of Inflammation and Metabolism, Department of Infectious Diseases, Rigshospitalet-Section 7641, Blegdamsvej 9, Faculty of Health Sciences, University of Copenhagen, DK-2100 Copenhagen, Denmark. krogh-madsen@inflammation-metabolism.dk

Erratum in

  • J Appl Physiol. 2010 May;108(5):1034.

Abstract

US adults take between approximately 2,000 and approximately 12,000 steps per day, a wide range of ambulatory activity that at the low range could increase risk for developing chronic metabolic diseases. Dramatic reductions in physical activity induce insulin resistance; however, it is uncertain if and how low ambulatory activity would influence peripheral insulin sensitivity. We aimed to explore if healthy, nonexercising subjects who went from a normal to a low level of ambulatory activity for 2 wk would display metabolic alterations including reduced peripheral insulin sensitivity. To do this, ten healthy young men decreased their daily activity level from a mean of 10,501+/-808 to 1,344+/-33 steps/day for 2 wk. Hyperinsulinemic-euglycemic clamps with stable isotopes and muscle biopsies, maximal oxygen consumption (VO2 max) tests, and blood samples were performed pre- and postintervention. A reduced number of daily steps induced a significant reduction of 17% in the glucose infusion rate (GIR) during the clamp. This reduction was due to a decline in peripheral insulin sensitivity with no effect on hepatic endogenous glucose production. The insulin-stimulated ratio of pAktthr308/total Akt decreased after step reduction, with a post hoc analysis revealing the most pronounced effect after 4 h of insulin infusion. In addition, the 2-wk period induced a 7% decline in VO2 max (ml/min; cardiovascular fitness). Lean mass of legs, but not arms and trunk, decreased concurrently. Taken together, one possible biological cause for the public health problem of Type 2 diabetes has been identified. Reduced ambulatory activity for 2 wk in healthy, nonexercising young men significantly reduced peripheral insulin sensitivity, cardiovascular fitness, and lean leg mass.

PMID:
20044474
DOI:
10.1152/japplphysiol.00977.2009
[Indexed for MEDLINE]
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