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Diabetologia. 2007 Sep;50(9):1815-1818. doi: 10.1007/s00125-007-0727-8. Epub 2007 Jun 22.

A 10-s sprint performed prior to moderate-intensity exercise prevents early post-exercise fall in glycaemia in individuals with type 1 diabetes.

Author information

1
School of Human Movement and Exercise Science, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, WA, 6009, Australia.
2
Department of Endocrinology and Diabetes, Princess Margaret Hospital, Subiaco, WA, Australia.
3
Centre for Child Health Research, Telethon Institute of Child Health Research, The University of Western Australia, Perth, WA, Australia.
4
School of Human Movement and Exercise Science, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, WA, 6009, Australia. fournier@cyllene.uwa.edu.au.

Abstract

AIMS/HYPOTHESIS:

We investigated whether a 10-s maximal sprint effort performed immediately prior to moderate-intensity exercise provides another means to counter the rapid fall in glycaemia associated with moderate-intensity exercise in individuals with type 1 diabetes.

MATERIALS AND METHODS:

Seven complication-free type 1 diabetic males (21.6 +/- 3.6 years; mean+/-SD) with HbA(1c) levels of 7.4 +/- 0.7% injected their normal morning insulin dose and ate their usual breakfast. When post-meal glycaemia fell to approximately 11 mmol/l, participants were asked to perform a 10-s all-out sprint (sprint trial) or to rest (control trial) immediately before cycling at 40% of peak rate of oxygen consumption for 20 min, with both trials conducted in a random counterbalanced order.

RESULTS:

Sprinting did not affect the rapid fall in glycaemia during the subsequent bout of moderate-intensity exercise (2.9 +/- 0.4 mmol/l in 20 min; p = 0.00; mean+/-SE). However, during the following 45 min of recovery, glycaemia in the control trial decreased by 1.23 +/- 0.60 mmol/l (p = 0.04) while remaining stable in the sprint trial, subsequently decreasing in this latter trial at a rate similar to that in the control trial. The large increase in noradrenaline (norepinephrine) (p = 0.005) and lactate levels (p = 0.0005) may have contributed to the early post-exercise stabilisation of glycaemia in the sprint trial. During recovery, adrenaline (epinephrine) and NEFA levels increased marginally in the sprint trial, but other counter-regulatory hormones did not change significantly (p < 0.05).

CONCLUSIONS/INTERPRETATION:

A 10-s sprint performed immediately prior to moderate-intensity exercise prevents glycaemia from falling during early recovery from moderate-intensity exercise in individuals with type 1 diabetes.

PMID:
17583795
DOI:
10.1007/s00125-007-0727-8
[Indexed for MEDLINE]

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