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Int J Sport Nutr Exerc Metab. 2014 Jun 9. [Epub ahead of print]

Acute Post-Exercise Effects of Concentric and Eccentric Exercise on Glucose Tolerance.

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  • 1Department of Sport & Exercise Sciences, University of Chichester, Chichester, United Kingdom.

Abstract

Impaired glucose tolerance was shown to be present 48 h following muscle-damaging eccentric exercise. We examined the acute effect of concentric and muscle-damaging eccentric exercise, matched for intensity, on the responses to a 2 hr 75-g oral glucose tolerance test (OGTT). Ten men (27±9 years, 178±7 cm, 75±11 kg, VO2max: 52.3±7.3 ml·kg-1·min-1) underwent three OGTTs after an overnight 12 hr fast: rest (control), 40-min (5 x 8-min with 2-min inter-bout rest) of concentric (level running, 0%. CON) or eccentric exercise (downhill running, -12%, ECC). Running intensity was matched at 60% of maximal metabolic equivalent. Maximal isometric force of m.quadriceps femoris of both legs was measured before and after the running protocols. Downhill running speed was higher (level: 9.7±2.1, downhill: 13.8±3.2 km·h-1, P<0.01). Running protocols had similar VO2 (P=0.59), heart rates (P=0.20) and respiratory exchange ratio values (P=0.74) indicating matched intensity and metabolic demands. Downhill running resulted in higher isometric force deficits (level: 3.0±6.7, downhill: 17.1±7.3%, P<0.01). During OGTTs, area-under-the-curve for plasma glucose (control: 724±97, CON: 710±77, ECC: 726±72 mmol·L-1·120 min, P=0.86) and insulin (control: 24995±11229, CON: 23319±10417, ECC: 21842±10171 pmol·L-1·120 min, P=0.48), peak glucose (control: 8.1±1.3, CON: 7.7±1.2, ECC: 7.7±1.1 mmol·L-1, P=0.63) and peak insulin levels (control: 361±188, CON: 322±179, ECC: 299±152 pmol·L-1, P=0.30) were similar. It was concluded that glucose tolerance and the insulin response to an OGTT were not changed immediately by muscle-damaging eccentric exercise.

PMID:
24912197
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