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Titolo:
Glucose kinetics and substrate oxidation during exercise in the follicularand luteal phases
Autore:
Zderic, TW; Coggan, AR; Ruby, BC;
Indirizzi:
Univ Montana, Human Performance Lab, Dept Hlth & Human Performance, Missoula, MT 59812 USA Univ Montana Missoula MT USA 59812 an Performance, Missoula, MT 59812 USA Univ Maryland, Sch Med, Dept Med, Div Gerontol, Baltimore, MD 21201 USA Univ Maryland Baltimore MD USA 21201 iv Gerontol, Baltimore, MD 21201 USA Baltimore Vet Affairs Med Ctr, Geriatr Serv, Ctr Geriatr Res Educ & Clin, Baltimore, MD 21201 USA Baltimore Vet Affairs Med Ctr Baltimore MD USA 21201 timore, MD 21201 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 2, volume: 90, anno: 2001,
pagine: 447 - 453
SICI:
8750-7587(200102)90:2<447:GKASOD>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
MENSTRUAL-CYCLE PHASE; FATTY-ACID OXIDATION; MUSCLE GLYCOGEN; METABOLIC RESPONSES; GROWTH-HORMONE; ESTRADIOL; RATS; WOMEN; HOMEOSTASIS; PERFORMANCE;
Keywords:
carbohydrate oxidation; fat oxidation; estradiol; lactate threshold;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Ruby, BC Univ Montana, Human Performance Lab, Dept Hlth & Human Performance, Missoula, MT 59812 USA Univ Montana Missoula MT USA 59812 mance, Missoula, MT 59812 USA
Citazione:
T.W. Zderic et al., "Glucose kinetics and substrate oxidation during exercise in the follicularand luteal phases", J APP PHYSL, 90(2), 2001, pp. 447-453

Abstract

The purpose of this investigation was to determine whether plasma glucose kinetics and substrate oxidation during exercise are dependent on the phaseof the menstrual cycle. Once during the follicular (F) and luteal (L) phases, moderately trained subjects [peak O-2 uptake ((V) over dot (O2)) = 48.2+/- 1.1 ml . min(-1) . kg(-1); n = 6] cycled for 25 min at similar to 70% of the ire, at their respective lactate threshold (70%LT), followed immediately by 25 min at 90%LT. Rates of plasma glucose appearance (R-a) and disappearance (R-d) were determined with a primed constant infusion of [6,6-H-2]glucose, and total carbohydrate (CHO) and fat oxidation were determined with indirect calorimetry. At rest and during exercise at 70%LT, there were nodifferences in glucose R-a or R-d between phases. CHO and fat oxidation were not different between phases at 70%LT. At 90%LT, glucose R-a (28.8 +/- 4.8 vs. 33.7 +/- 4.5 mu mol.min(-1). kg(-1); P < 0.05) and R-d (28.4 +/- 4.8vs. 34.0 +/- 4.1 <mu>mol . min(-1) . kg(-1); P < 0.05) were lower during the L phase. In addition, at 90%LT, CHO oxidation was lower during the L compared with the F phase (82.0 +/- 12.3 vs. 93.8 +/- 9.7 <mu>mol . min(-1) . kg(-1); P<0.05). Conversely, total fat oxidation was greater during the L phase at 90%LT (7.46 +/- 1.01 vs. 6.05 +/- 0.89 <mu>mol . min(-1) . kg(-1); P < 0.05). Plasma lactate concentration was also lower during the L phase at 90%LT concentrations (2.48 +/- 0.41 vs. 3.08 +/- 0.39 mmol/l; P < 0.05). The lower CHO utilization during the L phase was associated with an elevated resting estradiol (P < 0.05). These results indicate that plasma glucose kinetics and CHO oxidation during moderate-intensity exercise are lower during the L compared with the F phase in women. These differences may have been due to differences in circulating estradiol.

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Documento generato il 06/04/20 alle ore 08:31:35