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The Journal of Sports Medicine and Physical Fitness 2020 Mar 11

DOI: 10.23736/S0022-4707.20.10426-2


language: English

Postprandial glucose response moderation by cardiorespiratory fitness following short exercise bouts

Jeff M. MOORE 1 , Eric BARTHOLOMAE 2, Kathryn WARD 1, Jochen KRESSLER 1

1 San Diego State University, School of Exercise and Nutritional Sciences, San Diego, CA, USA; 2 Arizona State University, School of Life Sciences, Tempe, AZ, USA


BACKGROUND: Previous reports indicate that postprandial glucose (PPG) responses to exercise may depend on cardiorespiratory fitness (CRF), such that less fit individuals have greater reductions in PPG with exercise. Our aim was to investigate moderating effects of CRF on PPG response following exercise of progressively shorter durations and sedentary rest.
METHODS: Thirty-four participants (14 female) completed a 75g oral glucose tolerance test (OGTT) at seated rest. On three subsequent visits, participants completed additional OGTT with either 1, 3, or 10 minutes of stair-climbing. Fingerstick blood glucose measurements were taken every 15 minutes for 1 hour. CRF was determined using a treadmill ramp test.
RESULTS: There was a main effect of condition F(3, 93)=13.07, p<.001, ηp2=0.30. Stair-climbing reduced PPG iAUC compared to control by -3±27% (p=.546), -11±29% (p=.091), and -28±22% (p<.000) for the 1, 3 and 10 min bouts, respectively. There was no trial by CRF interaction for glucose iAUC F(2.4, 73.8)=0.69, p=.532, ηp2=0.02. Linear mixed model regression analysis revealed that CRF was not significantly associated with glucose iAUC, b=-14(-45,16), p=.339.
CONCLUSIONS: Contrary to previous reports CRF did not moderate PPG responses for either sedentary or exercise conditions in healthy men and women. Short, single-bout stair stepping exercise at a self-selected pace is equally efficient for all fitness levels.

KEY WORDS: Blood glucose; Postprandial glucose; Hyperglycemia; Stair climbing; Glycemic control; Exercise

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