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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
Rivista di Medicina, Traumatologia e Psicologia dello Sport
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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The Journal of Sports Medicine and Physical Fitness 2001 Giugno;41(2):203-9
Glucose tolerance during moderate prolonged exercise in women with oral contraceptives as compared to non-users
Boisseau N., Rannou F., Delamarche P., Bentue-Ferrer D. *, Gratas-Delamarche A.
From the Laboratoire de Physiologie et Biomécanique de l’Exercice Musculaire UFR-APS, Université de Rennes II
* Laboratoire de Pharmacologie Faculté de Médecine, Rennes, France
Background. The purpose of this study was to assess gluco-se tolerance during exercise in women on oral contraceptives.
Methods. To this end, we investigated the effects of glucose ingestion on glucose and hormonal responses in 7 women on oral contraceptives (OC(+); 21.3±1.3 yrs) and 7 normally menstruating (OC(-); 22.6±1.3 yrs) during an ergocycle test (30 min, 60% V.O2max). Venous blood samples were withdrawn at 0, 3, 5, 10, 15 and 30 min exercise and at the 30th min postexercise. Glucose was ingested per os (0.5 g·kg-1 b.w) between the 2nd and the 3rd min of the exercise.
Results. Under resting condition, plasma glucose and catecholamine concentrations were similar in both groups whereas plasma GH and insulin levels were greater in OC(+) (p<0.05). Glucose/insulin ratio (G/I), used as an indicator of insulin resistance, suggested a reduced insulin sensitivity at rest in the OC(+) (p<0.05). No significant differences were observed between OC(+) and OC(–) in plasma glucose, insulin, and catecholamine concentrations during exercise. Plasma GH values were greater in OC(+) from the 15th min of the exercise and during the recovery period (p<0.01).
Conclusions. This study indicated that oral glucose ingestion at the onset of prolonged submaximal exercise induced similar glucose tolerance in women taking or not oral contraceptives.