Abstract:
:This study examined the effects of a pre-experimental period of arm exercise followed by a 24-h carbohydrate (CHO)-poor intake, intended to reduce initial hepatic glycogen levels, on substrate and endocrine responses during prolonged CHO-loaded leg exercise. Seven subjects pedaled a cycle ergometer for 60 min at 62% VO2 max in the two following conditions: 1) after leg CHO loading followed by a 60-min arm exercise and a 24-h CHO-poor diet (CHOL + P), and 2) after leg CHO loading only (CHOL). Greater blood concentrations of fatty acids (1.2 vs 0.9 mEq X L-1), glycerol (0.41 vs 0.20 mmol X L-1), norepinephrine (2.09 vs 1.14 ng X ml-1), and epinephrine (0.38 vs 0.19 ng X ml-1) were observed in the CHOL + P as compared to the CHOL condition at min 60 of exercise. Insulin concentration was significantly (P less than 0.05) lower in the CHOL + P condition at rest and during exercise. There were no significant differences during exercise between the two conditions in blood glucose, lactate, glucagon, and cortisol concentrations. It is concluded that changes in blood glucose concentration do not solely account for metabolic and hormonal adaptations during prolonged leg exercise and that a pre-experimental period of arm exercise and CHO-poor diet, in spite of an increase in leg muscle glycogen, may provide a stimulus for such adaptations. It is suggested that the liver glycogen content may be involved in the regulatory mechanism.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Lavoie JM,Péronnet F,Cousineau D,Provencher PJdoi
10.1055/s-2008-1025897subject
Has Abstractpub_date
1984-06-01 00:00:00pages
146-51issue
3eissn
0172-4622issn
1439-3964journal_volume
5pub_type
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journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
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journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章
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journal_title:International journal of sports medicine
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journal_title:International journal of sports medicine
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journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章,随机对照试验
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