Increased dietary carbohydrate and endurance during single-leg cycling using a limb with normal muscle glycogen concentration
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1989
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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CARBOHYDRATE-LOADING; EXERCISE; ENDURANCE; GLYCOGEN
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-283
(Last edited on
2002/02/27 18:45:01 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
The purpose of this study was to test the hypothesis that increased availability of blood-borne glucose would improve endurance after carbohydrate loading. A single-leg exercise model was employed, taking advantage of the fact that supercompensation of muscle glycogen occurs only in a previously exercised limb. Endurance time to exhaustion at 70% of maximal oxygen uptake was determined for 11 males and three females who were then allocated to a control group or a high-carbohydrate group. For 3 days following Test 1 the control group maintained a prescribed normal diet whilst the CHO group increased the proportion of energy derived from carbohydrate. The endurance test was then repeated using the leg that was inactive during Test 1. Endurance time was increased on Test 2 for the CHO group but not for the control group. There was no indication of enhanced carbohydrate metabolism during Test 2 for the CHO group but mean heart rate was lower during Test 2 than during Test 1. These results suggest that the prior consumption of a high-carbohydrate diet improves endurance during high-intensity cycling with a limb with normal muscle glycogen concentration.
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