Influence of fluid intake pattern on short-term recovery from prolonged, submaximal running and subsequent exercise capacity
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1998
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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RUNNING; BEVERAGE; DRINKING; REHYDRATION; CARBOHYDRATE; RECOVERY; ENDURANCE; COMPARATIVE-STUDY
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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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103-366-634
(Last edited on
2002/02/27 18:45:08 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
The aim of this study was to examine if the pattern of fluid intake with a carbohydrate-electrolyte solution during 4 h recovery from prolonged, submaximal running would influence the subsequent endurance capacity. Seven well-trained athletes aged 19.8 plus/minus 0.3 years (mean plus/minus sx) took part in the study, which had university ethical committee approval. They ran at 70 percent VO2 max on a level treadmill for 90 min (T1), or until volitional fatigue, whichever came first, on two occasions, at least 7-10 days apart. Four hours later, the subjects ran at the same speed for as long as possible (T2), as a measure of their endurance capacity. During the 4 h rehydration recovery period, the runners were allowed to drink a carbohydrate-electrolyte solution (6.9 percent Lucozade-Sport; sodium, 24 mmol l-1; potassium, 2.6 mmol l-1; calcium, 1.2 mmol l-1; osmolality, 300 mOsm (kg-1) ad libitum on one occasion. On the other occasion, the volume of the same fluid was prescribed from calculations of the body mass loss during T1 (2.6 percent of pre-exercise body mass). All subjects completed the 90 min run during T1 on both trials. However, during T2, in the prescribed intake trial, the exercise time to exhaustion was 16 percent longer (P less than 0.05) than during T2 in the ad libitum trial (69.9 plus/minus 9.1 upsilon s 60.2 2 plus/minus 10.2 min). Although there was no difference between conditions in the total volume ingested (1499 plus/minus 155 upsilon s 1405 plus/minus 215 ml), the volume of carbohydrate-electrolyte solution ingested in the fourth hour of the rehydration recovery period was greater in the prescribed intake trial than in the ad libitum trial (258 plus/minus 52 upsilon s 78 plus/minus 34 ml; P less than 0.05). The amount of glucose ingested in this period during the prescribed intake trial was also greater than during the ad libitum trial (17.8 plus/minus 3.6 upsilon s 5.4 plus/minus 2.4 g; P less than 0.05). There was a higher blood lactate concentration at the start of T2 in the prescribed intake trial than in the ad libitum trial (1.12 plus/minus 0.20 upsilon s 0.94 plus/minus 0.09 mmol l-1; P less than 0.05), but there were no differences in blood glucose, plasma insulin, free fatty acid concentrations or urine volume between trials. The results of this study suggest that drinking a prescribed volume of a carbohydrate-electrolyte solution after prolonged exercise, calculated to replace the body fluid losses, restores endurance capacity to a greater extent than ad libitum rehydration during 4 h of recovery, even though the total volumes ingested were the same between trials.
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